U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY 

BUREAU OF RECLAMATION

Description of the

Pelagic Zooplankton and Fish Communities 

of Lakes Powell and Mead

By

Gordon Mueller, U.S. Geological Survey, Midcontinent Ecological Science Center 

'Michael J. Horn, U.S. Bureau of Reclamation ,Technical Service Center

Open File Report 99-109

Prepared in cooperation with Glen Canyon National Recreation Area, Lake Mead National 

Recreation Area, Utah Department of Wildlife Resources, Arizona Game and Fish Department, 

and Nevada Department of Wildlife.

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey 

editorial standards (or with the North American Statrigraphic Code). Any use of trade, product, 

or firm names is for descriptive purposes only and does not imply endorsement by the U.S. 

Government.

'P.O. Box 25007 (D-8220), Denver, Colorado 80225-0007
TABLE OF CONTENTS

LIST OF TABLES ...................................................... iv

LIST OF FIGURES ...................................................... v

EXECUTIVE SUMMARY ............................................... vii

INTRODUCTION ....................................................... 1

Study Site Description .............................................. 2

Lake Powell ................................................. 5

Lake Mead .................................................. 5

General Water Quality ......................................... 6

Pelagic Fishery ............................................... 7

METHODS ............................................................ 8

Study Site Selection ................................................ 8

Sampling Techniques ............................................... 9

Vertical Gill Netting .......................................... 9

Limnological Sampling and Analysis ............................ 10

Acoustical Sampling and Analysis .............................. 11

RESULTS ............................................................ 12

Zooplankton/NetPlankton/Phytoplankton .............................. 12

Zooplankton Acoustics ............................................. 24

Vertical Gill Nets ................................................. 32

Fish Analysis ..................................................... 33

Acoustical Analysis Techniques ................................ 35

Target Strength Distribution ................................... 35

Standing Crop Estimates ...................................... 39

Fish Distribution ........................................... 42

Fish Densities ............................................... 44

Striped Bass and Carp Population Estimates ....................... 52

DISCUSSION ......................................................... 54

The Pelagic Community ............................................ 54

Boom and Bust Fishery ............................................. 55
Fish Movements .................................................. 56

RECOMMENDATIONS ................................................. 57

ACKNOWLEDGMENTS ................................................ 58

LITERATURE CITED .................................................. 58

ANALYSIS SETTINGS AND FORMAT .................................... 62

DESCRIPTION OF THE DT ANALYSIS REPORT FORMAT .................. 63

APPENDIX A

STUDY SITE COORDINATES and TRANSECT PROFILES ................... 65

APPENDIX B

LIMNOLOGICAL DATA ............................................... 139

APPENDIX C

ZOOPLANKTON DATA ............................................... 247

APPENDIX D

NET PLANKTON DATA ............................................... 300

APPENDIX E

PHYTOPLANKTON DATA............................................. 326

APPENDIX F 

NETTED FISH DATA 

Species Composition 

Individual Fish Data 

Length-Weight Regressions .............................................. 354

APPENDIX G

ECHO-INTEGRATION ANALYSIS

STANDING CROP DATA AND STATISTICS .............................. 366

11
APPENDIX H

FISH SIZE AND DEPTH DISTRIBUTION

Inflow Areas For:

August 1996 and 1997 ................................................. 377

APPENDIX I

ECHO-COUNTING ANALYSIS

FISH DENSITY DATA AND STATISTICS ................................ 438

APPENDIX J

LARGE FISH (>16 CM) ANALYSIS

STRIPED BASS POPULATION ESTIMATES AND STATISTICS ............. 447

111
LIST OF TABLES

Table 1. Morphometric characteristics of Lakes Powell and Mead.................. 6

Table 2. Transect length (km) and surface area (ha) of the Lake Powell and Lake Mead 

study areas. ....................................................... 9

Table 3. Regression Coefficients for zooplankton biomass as a function of volume

acoustic backscatter in the 0-10m depth range. .......................... 27

Table 4. Species composition offish captured by vertical gill nets in Lake Powell and

Lake Mead from November 1995 through January 1998. ............. 32

Table 5. Average lengths, weights and ranges offish captured from Lake Powell and

Lake Mead from November 1995 through January 1998. .................. 33

Table 6. Total fish lengths (cm) for dorsal aspect target strengths (-dB) for 430 kHz

echosounder ..................................................... 36

Table 7. Kilograms offish biomass per surface hectare (90% =Conf. Limits) measured in 

the pelagic zone (>20 m) of Lake Powell and Lake Mead from November 1995 

through January 1998 using echo integration. ........................... 41

Table 8. Fish densities (fish/ha) measured in the pelagic zone (>20 m water column) of 

Lake Powell and Lake Mead from November 1995 through January 1998 using 

echo counting techniques. .......................................... 49

Table 9. Fish densities (fish/ha) and reservoir population estimates measured in the

pelagic zone (>20 m water column) of Lake Powell and Lake Mead in August of 

1996 and 1997 using echo counting procedures*. ........................ 50

Table 10. Reservoir population estimates of large fish (>16 cm) detected in the pelagic 

zone of Lake Powell and Lake Mead in August of 1996 and 1997 using echo 

counting procedures. .............................................. 51

Table 11. Reservoir population estimates for the pelagic striped bass, carp, and walleye 

in Lake Mead and Lake Powell from November 1995 through January 1998. . . 53

IV
LIST OF FIGURES

Figure 1. General Map of Lake Powell showing study sites and zones. .............. 3

Figure 2. General Map of Lake Mead showing study sites and zones. ............... 4

Figure 3. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the 

water column in Lake Mead. November 1995, January 1996. .............. 13

Figure 4. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the 

water column in Lake Mead. May 1996 - January 1997. .................. 14

Figure 5. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the 

water column in Lake Mead. May 1997 to January 1998. ................. 15

Figure 6. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the 

water column in Lake Powell. November 1995 to January 1996. ............ 16

Figure 7. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the 

water column in Lake Mead. May 1996 to January 1997. ................. 17

Figure 8. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the 

water column in Lake Mead. May 1997 to January 1998. ................. 18

Figure 9. Average whole reservoir zooplankton biomass (Cladocera, Copepoda, Rotifera) 

(wg/L) for Lakes Powell and Mead. ................................... 19

Figure 10. Average total lake-wide net plankton biomass (wg/L) for Lake Powell and

Lake Mead. ...................................................... 20

Figure 11. <500 um size class as a percentage of total net plankton biomass inn Lake

Powell and Lake Mead ............................................. 20

Figure 12. Average lakewide phytoplankton cell density in the top 30m of the water

column for Lake Powell and Lake Mead. ............................... 21

Figure 13. Seasonal vertical distribution of zooplankton biomass at station PI (upper

graph and at Ml, Lower graph). ...................................... 22
Figure 14. Diel vertical migration of zooplankton in Lake Powell during August. .... 23

Figure 15. Correlation between filtered and enumerated zooplankton abundance for

Lake Mead for the 0-10m and 10-20m depth strata ....................... 28

Figure 16. Correlation between filtered and enumerated zooplankton abundance for

Lake Powell for the 0-10m and 10-20m depth strata. ...................... 29

Figure 17. Spatial distribution of zooplankton in Warm Creek Bay, Lake Powell. Picture 

on the left is the echo-trace generated by the hydroacoustic gear. The picture on 

right is a graphical representation of differences in relative zooplankton densities, 

with the darker shaded regions representing higher densities. ............... 31

Figure 18. Echogram illustrating bubble plumes caused by sediment gas generation. . 34

Figure 19. Target strength distribution (-40 to -80 dB) in Lake Powell during August

1996 using a single-beam echosounder ................................ 36

Figure 20. Target strength distribution (-40 to -80 dB) in Lake Mead during August 1996 

using a single-beam echosounder. .................................... 37

Figure 21. Target strength distribution (-40 to -80 dB) in Lake Powell during August

1997 using a dual-beam echosounder. ................................. 37

Figure 22. Target strength distribution (-40 to -80 dB) in Lake Mead during August 1997 

using a dual-beam echosounder. ...................................... 38

Figure 23. Target strength distribution (-40 to -80 dB) for August 1997 transects

collected at Lake Powell. ........................................... 39

Figure 24. Pelagic fish biomass (CL=90%) of Lake Powell measured quarterly from

November 1995 through January 1998 ................................. 40

Figure 25. Pelagic fish biomass (CL=90%) of Lake Mead measured quarterly from

November 1995 through January 1998. ................................ 42

Figure 26. A daytime echogram taken August 1997 on Lake Powell showing fish schools 

concentrated near the reservoir's thermocline. ........................... 43

VI
Figure 27. A night echogram showing fish dispersal within the top 20 m of the water

column. ........................................................ 44

Figure 28. A January 1998 echogram showing fish concentrated at depths >50 m in the 

Escalante River Arm of Lake Powell. ................................. 44

Figure 29. Seasonal distribution of pelagic fish biomass in Lake Mead, Arizona-Nevada 

from November 1995 through August 1996. ............................ 45

Figure 30. Seasonal distribution of pelagic fish biomass in Lake Powell, Utah from

November 1995 through August 1996. ................................. 46

Figure 31. Seasonal distribution of pelagic fish biomass in Lake Mead, Arizona-Nevada 

from May 1997 through January 1998. ................................ 47

Figure 32. Seasonal distribution of pelagic fish biomass in Lake Powell, Utah from

Mayl997 through January 1998. ..................................... 48

Figure 33. Comparison of the total numbers of pelagic fish, fish larger than 16 cm, and 

striped bass found in Lake Powell and Lake Mead during August 1996 and 1997. 

............................................................... 52

vn
EXECUTIVE SUMMARY

The pelagic zooplankton and fish communities of Lake Powell and Lake Mead were described 

and quantified through active sampling and use of single and dual beam scientific echosounders. 

Data collected on a quarterly basis for 2.5 years yielded information on fish distribution, size 

frequency, biomass (kg/m3 , fish/ha), and densities (fish/m3 , fish/ha). Surveys taken in August

1996 and 1997 were used to calculate the pelagic standing crop (kg/ha) and population estimates 

for striped bass.

Vertical gill nets fished from the surface to depths >30 m captured 449 fish representing six 

species. In Lake Powell, 240 fish included striped bass, threadfin shad, carp, walleye, and 

channel catfish. Lake Mead yielded 209 similar species with the addition of rainbow trout and 

absence of walleye. The catch was dominated by striped bass (44-57%), threadfin shad (24- 

50%) and carp (7-15%). The remaining three species represented less than 5% of the total catch. 

No centrarchids or native species were captured.

Vast volumes of pelagic habitat in the lower or downstream portions of these reservoirs contain 

few if any fish (<100/ha). Pelagic fish production was concentrated at the more productive 

inflow areas. Lake Powell's highest production was (total kg%) found at the Colorado River 

inflow (45-75%=P14, P13, P12), upper San Juan Arm (6-15% P08, P07), and Warm Creek (0.9- 

21%= P03) areas. Similarly on Lake Mead, fish production was most pronounced at Las Vegas 

Wash (10-59%=M02), upper Overton Arm (4-57%=Ml 1) and Colorado River inflow (14- 

59%=M09, M08). The highest levels offish biomass were measured at the Colorado River 

inflow (710 kg/ha) of Lake Powell and at Las Vegas Bay (292 kg/ha) where treated sewage 

effluent enters Lake Mead.

Fish standing crop was highly variable on a seasonal and annual basis. Fish numbers and 

biomass peaked after spawning (August), and measurements were lowest prior to spawning 

(March). Total reservoir standing crop in Lake Powell ranged from 453,097 kg in May 1996 to a 

study high of 10,852,738 kg in August 1996. Standard monitoring (Utah Department of Wildlife 

Resources) suggests the August 1996 levels may have represented a 25 year high. Levels in

1997 were substantially lower at 162,262 kg and 2,228,942 kg for the same months. Trends were 

similar for Lake Mead. May and August represent the low and high months, and overall 

production was higher in 1996. Total reservoir biomass was 296,736 in May and rose to 

1,926,697 by August 1996. Values in 1997 were slightly lower at 101,016 kg in May and 

1,454,778 in August.

Lake Powell fish densities were highest at the Colorado River inflow (PI4= 144,668 fish/ha) 

while Lake Mead's were found at Las Vegas Wash (M02=l5,131 fish/ha). Densities declined 

from August 1996 to August 1997 for both reservoirs. Lake PowelFs pelagic fish population 

was estimated at 276 million for August 1996 and 91 million for August 1997. Lake Mead 

estimates were approximately half of Lake Powell's, at 108 and 66 million respectively. While 

the total numbers offish declined (-39 and -67%) between August 1996 and 1997, the percentage

viii
of large fish (>16 cm) within each community increased nearly 300%. The pelagic striped bass 

community was estimated to have increased from 2.5 to 4.1 million in Lake Powell and 0.8 to 1.5 

million in Lake Mead. We speculate that the rapid shift in predator/prey numbers may reflect 

the intercept of the predator/prey cycle. Increases in striped bass at the expense of threadfm shad 

which were rapidly disappearing. By the summer of 1998, striped bass in both reservoirs were 

experiencing extremely poor body condition, reduced numbers, and die-offs in some localized 

areas in Lake Powell.

Pelagic standing crop in both reservoirs exhibited a wide annual cycle between May (prespawning) and August (post-spawning). Variability in annual reproductive output is 

substantially greater than variability in annual carrying capacity. Spawning success does not in 

itself guarantee survival, but may be combined with carrying capacity during late winter as an 

indicator of the health reservoir fish populations. Managers should consider implementing some 

type of long-term acoustical monitoring program in order to develop the necessary data base to 

monitor changes in reservoir productivity. This could be easily and economically accomplished 

through late winter/early spring surveys.

IX
INTRODUCTION

Fishery biologists from Arizona, Nevada, and Utah have been faced with the imposing dilemma 

of monitoring the pelagic fishery of Lakes Powell and Mead. Standard sampling procedures 

typically used to monitor shoreline fisheries are simply inadequate for the deep volumes of 

pelagic habitat found in these two reservoirs. Nearly a decade ago, Arizona and Nevada 

biologists recommended that hydroacoustics be used to monitor these communities (Persons and 

Dreyer 1987a,b, NDOW 1994). However, for various reasons an acoustical monitoring program 

was never fully implemented. This study represents the first attempt to describe the pelagic 

fishery of either reservoir using acoustic technology.

The objective of this two and one-half year study was to develop a data base which described the 

spatial distribution, densities, and standing crop of the pelagic zooplankton and fish communities 

of Lake Mead and Lake Powell. The two and a half year field study effort produced over 750 

transects of acoustic data. The overall goal was not to conduct a comprehensive analysis of the 

data base, but rather to present a preliminary summary of the population and standing crop 

information and present the data base to management agencies for future use. Aspects of the data 

base will be further analyzed and hopefully publications will follow. The digitized data base will 

remain on file at both the Bureau of Reclamation's Technical Service Center (USER) in Denver 

and with the United States Geological Survey (USGS) field station located in the same complex. 

It is available upon request to local resource managers, researchers, and modelers for further use.

An old fisherman's saying is that; "95% of the fish are found in 5% of the lake." Without a 

doubt, a great deal of fish production occurs in the shallower, protected littoral habitats. This 

investigation focused on the other 95% of the lake, known as the pelagic, or deep water zone. 

This study focused on striped bass and threadfm shad, species which dominate the pelagic 

fishery and represent the principal predator and prey species for both reservoirs. Limited data 

were collected in the littoral zone, but they were not analyzed due to three factors: 1) difficulty of 

sampling shallow habitats, 2) difficulty of detecting fish found in cover, and 3) the complexity of 

the fish community. Littoral or shoreline surveys are feasible, but the time and resources 

required were beyond the scope of this study.

Pelagic Communities - Very little is known about the distribution or standing crop of 

zooplankton and pelagic fish communities in Southwestern reservoirs. Until recently, standard 

sampling protocols didn't provide an effective method of measuring or following populations in 

medium, let alone large, bodies of water. Resource managers have typically monitored 

community trends by creel census, relative abundance information, and in some cases by trawl 

data. Population trends are then determined by comparing relative abundance. Active 

(electrofishing, trawling, angling) and passive (gill nets, traps) sampling methods provide 

managers trend information on fish numbers captured per unit time and effort. The resulting 

information provides an index that can be used to compare fish abundance trends. However, 

nearly all sampling methods have some degree of bias and are rarely used to develop population
or standing crop estimates. While these techniques provide trend information, they are typically 

inadequate or too costly for use in population estimates.

The advent of the scientific echosounder, combined with advanced computer technology 

provides an effective and economical method of sampling large volumes of pelagic habitat. 

Unlike standard netting or trawling, fish do not easily evade detection and communities can be 

accurately measured (densities and biomass) while minimizing the need to actually handle fish. 

Previously, mark-recapture techniques provided the only method of standing crop estimates short 

of ichthyocides (rotenone), drainage, or non-reproductive fisheries. Aquatic biologists now have 

the technology to not only enumerate, but to also map the 3-dimensional distribution offish and 

other aquatic organisms. The simple question of "how may fish?" can now be addressed.

Fisheries acoustics can provide information on spatial distribution, fish density and biomass, and 

size distribution. The technology is not new, but until recently, acoustics was rarely used for 

inland fisheries work because of high equipment costs and limited acceptance of the technology. 

Advances in digital computer technology, better training, and market competition has lowered 

costs making the technology affordable to state and federal agencies. Today, fishery acoustics is 

touted as an effective and reliable method of measuring pelagic planktivorous fish (Fleischer et 

al. 1997, Boxrucker 1996)

A better understanding of population size and structure of specific species could provide 

information to help managers set creel and slot limits and actually direct harvest efforts. While 

short-term management benefits derived from specific species are obvious, the long-term 

management implications of measuring overall fish production are equally important. 

Fluctuations in species composition is complex and often influenced by biological interactions 

such as predator/prey relationships, species composition, colonization of new species, and 

normal hydrologic or climatic cycles. Often it is difficult, if not impossible to determine if 

changes in relative abundance of a single, or group, of species represent a shifts within 

community structure or actually denotes changes in overall productivity or habitat.

Development of quantifiable baseline data on zooplankton and fish standing crop should provide 

managers and researchers the best chance of detecting shifts caused by fishery managment 

practices or habitat degradation related to changes in pollution, water and land use, or climatic 

change. The data base can furhter be used to better understand seasonal habitat preferences as it 

relates to physical and chemical water quality parameters. Lastly, acoustical monitoring provides 

an effective method of determining habitat suitability through the simple presence or absence of 

fish or zooplankton.

Study Site Description

Lake Powell and Lake Mead are located on the Colorado River and represent the two largest (by 

volume) manrnade reservoirs in the Western Hemisphere (Figures 1 and 2). Located in the arid 

Southwestern United States, both reservoirs were built for water storage, flood control, and
TOc

O

Trachyte 

P14

Cedar Canyon 

P12

Lake Powell

Warm Crk. 

P03

Padre Bay 

P04

Bull FrogBay Plli 

Escalante

River P09

Rincon

Spencer's 

Camp P08

Colorado

River

Inflow

Good Hope 

Bay P13

San Juan River 

Inflow

Glen Canyon \f Dam P01 J

CR Narrows 

P02

PS X

Oak Canyon 

P05

Gooseneck 

Bend P06

\ 

Neskahi

P07

rCO

I

03tr

15

OQ

03
Lake Mead

Virgin

River

Inflow

Upper Overton 

Arm Mil

Lower Overton 

Arm M10

Black Canyon

Callville M04

T 

_ Las Vegas Las Vegas B

Wash

Hoover 

Dam M01

Grand Wash 

M09

Colorado

River

Inflow

Gregg's

Basin M08

§ to

O8I

2 8

O

O)2

8.

C/5 tr 

o

C/5

I

Spring Canyon 

M07
hydroelectric power and represent key operational features in the Colorado River Compact which 

regulates and manages water for the 7 southwestern states (WPR 1978). Lake Powell is found 

immediately upstream of the Grand Canyon on the Utah-Arizona state border while Lake Mead 

is located 380 km downstream, immediately downstream of the Grand Canyon and is bordered 

by Arizona and southern Nevada.

Lake Powell - Glen Canyon Dam is located near Page, Arizona, which is about 2 km downstream 

of the Utah/Arizona state line and 24 km upstream of Lee's Ferry, Az. The facility was built and 

is operated by the Bureau of Reclamation. Glen Canyon Dam was authorized under the 

Colorado River Storage Project. Construction began in 1956 and was finished by 1963. It 

represents one of the largest concrete arch dams in the world. The dam backs up water for over 

340 km into the Colorado , San Juan, Escalante, and Dirty Devil Rivers. Principal inflows 

originate from the Colorado (88%) and San Juan (10%) Rivers. The reservoir is extremely 

narrow and irregular having steep canyon walls and 96 major side canyons. Lake Powell is 

accurately described as a large, inundated canyon. Wahweap and Padre Bays are located in the 

lower portion of the reservoir and represent the reservoirs largest basins. Lake Powell's surface 

area at full pool (el. 1,128 m) reaches 65,315 ha and the reservoir has 3,170 km of shoreline 

which exceeds that of coastal California. The reservoir initially filled in 1980, and has 33 x 109 

cubic meters of active storage.

Lake Powell has a maximum depth of 178 m. Water is discharged through Glen Canyon Dam at 

elevation 1,052 m, normally a depth greater than 70 m. Discharge temperatures are cold and 

average about 8 to 9 °C. Reclamation and other agencies are examining the possible modification 

of the intake towers that would allow the release of warmer surface waters (BOR 1999).

The reservoir and surrounding area were incorporated into the National Park Service (NPS) 

system in 1968 through the creation of Glen Canyon National Recreation Area. The area is 

remote and access limited to 4 marinas: Wahweap, Hall's Crossing, Bull Frog, and Hite. 

Visitation is estimated at more than 3 million tourists a year.

Lake Mead - Hoover Dam is located in Black Canyon about 30 miles from Las Vegas, Nevada, 

and represents the highest and third largest concrete dam in the USA. The facility was built and 

is managed by the Bureau of Reclamation. The Boulder Canyon Project was authorized in 1928 

as a solution to regulate the Colorado River by building a single dam. Construction was 

authorized under terms of the Colorado River Compact (1922). Work began in 1931 and the 

dam was dedicated in 1935.

The reservoir is approximately 185 km long and inundates portions of the Colorado and Virgin 

rivers. Lake Mead is comprised of four large basins: Boulder, Virgin, Temple, and Gregg. The 

reservoir was initially filled in 1940, with 36 x 109 cubic meters of storage, over 3 years of 

Colorado River flow. At full pool maximum width is 12.8 km with a depth of 178 m. Lake Mead 

at full pool has 165,815 surface ha and 885 km of shoreline. The reservoir serves as the primary 

surface water supply for Nevada, California, and Arizona.
The area encompassing Lake Mead and Lake Mohave was dedicated in 1964 to the NFS system 

as the Lake Mead National Recreation Area. Access to restricted on Lake Mead is restricted 

primarily to major marinas located at: Las Vegas Bay, Hemenway Harbor, Callville Bay, Echo 

Bay, and Temple Bar, and a few smaller facilities.

Table 1. Morphometric characteristics of Lakes Powell and Mead.

Criteria

Maximum Operation Level (m)

Maximum Depth (m)

Mean Depth (m)

Surface Area (km2)

Volume (m3 x!09)

Maximum Length (km)

Maximum Width (km)

Shoreline Development

Discharge Depth (m)

Retention Time (yr.)

Lake Powell

1128.0

171.0

51.0

653.0

33.0

300.0

25.0

26.0

70.0

3.3

Lake Mead

374.0

180.0

55.0

660.0

36.0

183.0

28.0

9,7

83.0

3.7

General Water Quality - The Colorado River flows through relatively barren deserts and is fed 

by snowmelt from tributaries draining mountains of Colorado, Utah, Arizona, and New Mexico. 

There is roughly 630,000 km2 within its drainage. The combination of snow melt, violent 

storms, and droughts produce a wide range of seasonal variations in discharge ranging from 20.5 

to 425,000 m3 per minute. Equally impressive has been the remarkably high sediment load 

accompanying floods that averaged >108 metric tons/year prior to the construction of Hoover 

Dam in 1935.

Construction of the mainstem dams greatly influenced specific aspects of water quality. 

Sediment transport was essentially halted downstream of the major reservoirs as they trapped 

sediments. Once impounded, the turbid river waters cleared. In terms of average nutrient levels 

and productivity, both reservoirs are phosphorus limited (<0.02 mg/L) and considered 

oligatrophic to mildly mesotrophic (LaBounty and Horn 1997, Paulson and Baker 1983, 

Vollenwieder 1970). Primary production is the highest at the inflows and decreases as one 

moves down lake. Highest productivity in Lake Powell is found at the Colorado and San Juan 

River inflow areas and at Warm Creek. The highest productivity in Lake Mead is found in Las 

Vegas Bay which receives wastewater effluent from Las Vegas Valley, and in the Virgin and 

Colorado River inflow areas.

Both reservoirs exhibit thermal, and in some cases, chemical stratification. A strong thermocline 

develops in summer at depths ranging from 15 to 25 m and surface water temperatures on Lake 

Mead reach 30 °C in shallow, protected areas. The hydrodynamics of these systems are complex
and influenced by the volume, location, and patterns of inflows and releases, and by reservoir 

morphology (LaBounty and Horn 1997).

Pelasic Fishery - Hoover Dam was constructed in 1936, creating Lake Mead which represented 

the first mainstem reservoir on the Colorado River designed for water storage and flood control. 

Construction of Lake Powell followed in 1964. Both reservoirs established impressive sport 

fisheries and were renown for their production of record black bass. The Lake Mead largemouth 

bass fishery peaked in 1963 with an estimated harvest of 799,592 fish (Allan and Roden 1978). 

The Lake Powell largemouth bass fishery peaked in 1971 (Scott and Gustaveson 1986).

Threadfin shad (Dorosomapetenense) were introduced to Lake Mead (1953) and Lake Powell 

(1968) to provide additional forage (May et al. 1975, Allan and Roden 1978). The introductions 

were a huge success and the species not only colonized the reservoir, but quickly spread 

throughout the entire lower river basin (Minckley 1973). Although threadfm shad abundance 

remained high, the annual harvest of largemouth bass dropped below 200,000 after 1970. 

Anglers had annually harvested over 400,000 largemouth bass between 1953 and 1969 (Allan 

and Roden 1978). Centrarchids were restricted to the shallower, shoreline habitats while their 

prey remained abundant in the reservoirs pelagic zone. State agencies began introducing pelagic 

game species into the unutilized deeper habitats in order to expand reservoir production. 

Smallmouth bass were introduced into Lake Powell to expand the warm water creel and several 

species of trout and stripped bass were stocked to establish a pelagic, cold water fishery (Allan 

and Roden 1978, Blommer and Gustaveson 1997).

Striped bass, salmon, and trout introductions were made on the belief that stocked fish would not 

be able to successfully spawn. However, it soon became apparent that one species; striped bass 

could. By 1982, the harvest of striped bass from Lake Mead surpassed all other species in the 

angler's creel (NDOW 1995). Similar trends soon followed in Lake Powell. It's estimated that 

anglers annually harvest nearly 1 million striped bass from Lake Mead (personal communication 

Jonh Hutchings NDOW) and 250,000 from Lake Powell (personal communications- Wayne 

Gustaveson UDOWR).

Pelagic habitats in both Lake Mead and Lake Powell are dominated by these two species. 

However, populations are extremely cyclic due to their reproductive capability, habitat 

conditions, food availability, prey overcropping, and thermal intolerance. Lake Powell 

represents the northern range for the threadfm shad in the Colorado River and winterkills are not 

uncommon. These kills occur not only during the winter, but can also be triggered by sudden 

warming trends in late winter or early spring (Gustaveson personal communique). Similar dieoffs have not been reported on Lake Mead. While threadfin shad periodically reach their lower 

thermal limits, it's known from Southeastern reservoirs that adult striped bass distribution mat 

also be influenced by thermal stratification (Coutant 1985).

The two species form a two-story fishery during reservoir stratification. Threadfin shad and 

juvenile striped bass prosper in the warmer, more productive surface waters and can tolerate

7
temperatures exceeding 35 °C. However, adult striped bass have a lower thermal tolerance 

which restricts them to deeper and cooler depths where food is often scarce. It has been 

speculated that during periods of strong thermal stratification, large striped bass may actually be 

isolated from their prey base resulting in poor body condition, decreased fecundity, and some 

cases death.

The prolific nature of both species, combined by the simple food chain results in dramatic 

population swings. An abundance of shad leads to increased fecundity and production of 

stripped bass. As striped bass year classes mature and switch toward a fish diet, the prey base 

can be severely depleted leading to emaciated predators and fish die-offs. As predators decline 

in numbers and condition, shad populations rebound, repeating the cycle. Trend data suggests 

these boom and bust cycles are fairly predictable, taking 3 to 4 years for each reservoir (NDOW 

1995).

METHODS 

Study Site Selection

The types of pelagic habitat were categorized with the help of local biologists (Utah, Arizona, 

Nevada, Reclamation, NFS). We discussed the known or perceived importance of specific areas, 

logistical problems (i.e., distance & time), and public safety issues (i.e. night netting and 

recreational boat traffic) associated with the proposed project. As a result, 25 study sites were 

selected: 14 on Lake Powell and 11 on Lake Mead (Figures 1 and 2, Appendix A). Each site 

represented a major habitat type which fell into the categories of: large basins, inundated 

mainstem canyons, inundated side canyons, and fluctuating inflow nursery habitats. Actual 

sample sites (transect locations) were drawn on topographical maps along with the larger, 

corresponding study "zones." Surface area (full pool) of each habitat zone was measured with a 

digital planimeter and transect distance was determined using a Global Positioning System 

(GPS.) (Table 2).

Each study site contained four acoustical transects, three to measure fish standing crop, and one 

for zooplankton. At both dams and in the Escalante arm only three transects were run, two for 

fish and one for zooplankton. Transects typically crossed from opposing shorelines and were 

parallel to one another. There were exceptions at both dams and narrow canyons. At dams, 

transects ran from the center of the safety buoy line down the channel's thalweg for 

approximately 1 to 2 km and then ended or began along shore, where the same transect was 

repeated in the opposite direction. In narrow canyons, we started from shore, ran down the 

channel's thalweg for 1-2 km and then ended on the opposing shoreline. The transects zigzagged longitudinally along the canyons. The cumulative transect distance for each trip was 70.8 

km on Lake Powell and 95.0 km on Lake Mead.

Field surveys were conducted from a 7 meter cutty cabin craft powered with a 225-hp outboard 

motor. The vessel was equipped with differential GPS, fathometer, radar, DC/AC power, a side-
mounted retractable hydrofoil, and an automatic-drip coffee maker. Transect coordinates were 

programmed into the GPS's navigational system to aid navigation and allow for repetitive 

sampling (Appendix A).

Table 2. Transect length (km) and surface area (ha) of the Lake Powell and Lake Mead 

study areas.

Lake Powell Trans. Area* Lake Mead Trans. Area* 

(km) (ha)_____________(km) (ha)

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

Pll

P12

P13

P14

Glen Canyon Dam 2.86

Channel

Warm Creek

Padre Bay

Oak Canyon

Goose Neck

Piute Bay

Spencer's Camp1

Escalante

Rincon

Bull Frog

Cedar Canyon

Good Hope Bay

Trachyte Canyon

Total

5.

4,

12,

5

4

4

2

4

4

4

4

6

.39

.18

.07

.26

.94

.81

.35

.33

.74

.72

.79

.34

4.08

70.86

219.

3,032.

7,175.

16,520.

6,019.

1,905.

2,265.

2,087

1,583.

5,264.

6,150.

8

7

8

5

7

6

7

.9

6

4

9

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

Mil

4,424.1

4,353.

2,889.

6

2

Hoover Dam

Las Vegas Bay

Callville

Boulder Canyon

Virgin Basin

Temple

Spring Canyon

Gregg Basin

Grand Wash

Lower Overton

Upper Overton

Total

3.08

6.52

12.87

4.95

14.32

11.59

5.15

10.46

4.67

8.85

12.55

95.01

121.4

2,

10,

922.

329.

7

2

1,190.2

16,

5,

4,

3,

021.

163.

645.

038.

461.

7

2

9

1

0

2,983.4

12,801 .5

59,678

63,894

* Surface elevation: Powell= 

'Originally was Zahn Bay

1,127.8 m, Mead=@ 365.8 m.

It would have been preferable to standardize the collection time (day/night) for all sites, however, 

this was unrealistic due to the distances between sites and safety concerns related to night 

navigation. While data were collected both day and night, we reserved night surveys for high 

density areas and surveyed lower density areas during daylight hours. It's preferable to survey at 

night when fish schools disperse making echo integration and counting more accurate.

Sampling Techniques

Vertical Gill Netting - Species composition was determined using vertical gill nets. Six 

individual nets each with a different mesh size, with one having two sizes for a total of seven, 

were fished from the surface to a minimum depth of 30 m. Mesh sizes ranging from 12 mm to 

64 mm. Nets were 2.5 m wide and were rolled on floatation spools. Rigging consisted of two
floatation buoys, three lighted spar buoys, two-20 kg anchors and 350 m of 1.2 cm nylon line. 

The rigging was set relatively close to shore at depths ranging from 30 to 50 m. Nets were 

lowered and spreader bars attached until the nets reached within 1-2 m of the lake's bottom. 

Nets were set at dusk and allowed to fish overnight (12 hours). At dawn the nets were respooled. 

Fish weights, lengths, types, and depths were recorded. We attempted to sample five to six 

different areas on each reservoir.

Limnological Sampling and Analysis - Vertical water column profile data were collected using a 

Hydrolab Surveyor III data logger. The instrument was calibrated prior to each field trip. 

Profiles were collected at the deepest zooplankton sampling site. Temperature, dissolved oxygen, 

conductivity, and pH were collected at discrete depth increments from the surface to the bottom, 

or a maximum depth of 100 m. Depth intervals sampled varied season to season. During times 

when reservoirs were nearly isothermal data was only collected every ten meters. As 

stratification increased more depth intervals had to be collected to describe the water column.. 

Data was stored using the data logger and downloaded at the conclusion of each field trip. Data 

were typically only collected down to a depth of 100 m due to equipment limitations.

Zooplankton were collected using a 64 um birge style closing net with a 15 cm diameter mouth, 

and a snap shackle release mechanism. Three depths were sampled at each transect; 0-10 m, 10- 

20 m and 20-30 m. Duplicate zooplankton samples were collected at each depth - one at the 

beginning of the transect and one at the end. Samples were preserved in Lugols and stored in 

amber nalgene bottles until analyzed. Duplicates were pooled prior to analysis. An attempt was 

made to collect all zooplankton samples during daylight hours. This was done to minimize the 

effects of diel vertical migration affects when doing site to site comparisons.

Zooplankton enumerations were preformed by Dr. John Beaver, BSA. Three types of analyses 

were completed for each sample. Total zooplankton counts were performed and organisms 

enumerated as #/L down to species level when possible. Taxa were grouped into three major 

groups, rotifera, cladocera and copepoda for data presentation. Up to ten individuals of the most 

common taxa were measured and an estimated weight determined based on volume, allowing 

total biomass/L to be calculated. Net phytoplankton was counted and identified to species. Net 

phytoplankton primarily included algal species large enough to be entrained in a 64 um plankton 

net.

Following enumeration, plankton samples were fractionated into three size classes using nitex 

netting mounted to pieces of 2.5 inch diameter schedule 40 PVC piping. Samples fractionated 

into >1000 um, 500-1000 um and <500 um. To obtain a total estimated plankton biomass dry 

weight after enumeration, samples were filtered onto Whatman GF/C filters and dried for 24 hrs 

at 50 °C then weighed. The purpose of size fractionation was primarily to help in facilitation 

analysis of hydroacoustic data, and to explore differences in relative proportions of zooplankton 

biomass as a proportion of total plankton biomass.

10
Zooplankton biomass, determined through counts was plotted for each station over time and 

depth; major groups as well as total biomass were identified. For spatial distribution across the 

reservoirs, the use of satellite images for each reservoir were employed. Average biomass (0- 

30m) for each site was determined and a suitable scale developed to encompass the range of 

values observed. Approximation was used to determine where changes in zooplankton between 

sites occurred. Usually this meant just splitting the difference between two sites. In the case of 

stations where large morphological differences in the lake were apparent such as sites between 

canyons and basins, the split was made at the interface of the two by making the assumption, 

each site was similar within itself. Thus, the images portrayed do not take into account 

patchiness in zooplankton communities nor may they represent the actual locations in the 

reservoir were density shifts occur. Areas on the reservoir not sampled were blacked out in the 

satellite pictures. These included the Muddy River Basin and Bonelli Bay on Lake Mead, and 

Navajo Canyon and the area around Castle Rock on Lake Powell. It was felt these sites were 

quite different from the surrounding reaches of the lake that were sampled, and were therefore 

left blank.

Acoustical Sampling and Analysis - Acoustical data were collected using a BioSonics , 

single-beam (DT-4000) scientific echosounder during the first year (November 1995 to August 

1996) and dual-beam system (DT-5000) during the last year (November 1996 to January 1998). 

The DT-4000 used a 6° single beam transducer and the DT-5000 used a 6.2-13.6° dual-beam 

transducer. Both versions operated at 420 kHz. The transducer was mounted on hydrofoil which 

was lowered beside the boat and towed at a depth of 50 cm.

Fish surveys typically started along shore at depths <5 m. Fish detected from within a meter of 

the transducer to the lake's bottom (<101 m) were counted and extrapolated to volume. Plankton 

surveys examined depths between 1 to 30 m and were collected at -90 dB (0.5 mm). Surveys 

were conducted at speeds of 8 to 10 km/h. Data collection was collected at a rate of 3 to 4 

pings/s. Acquisition thresholds were set at -60 to -70 dB for fish and at -90 dB for zooplankton. 

Data were collected using a pentium class laptop computer and all data were stored on ZIP 

disks for future analysis..

We consulted area biologists and defined "pelagic" as a water column greater than 20 m in depth. 

Data analysis was accomplished using three individual desktop computers loaded with 

BioSonics Analysis Program, Version 2.1.1. The analysis started at the ping where depths 

exceeded 20 m and continued until we reached depths <20 m on the opposite shoreline. The only 

exception to the depth criteria was at the inflow sites where depths occasionally were shallower 

than 20 m due to seasonal fluctuations in reservoir elevation.

Analysis involved three steps: editing echograms, set up, and analysis. Each echogram was 

reviewed prior to analysis to determine the number of pings to be analyzed (number of pings 

where depth exceeds 20 m) and to examine for acoustic abnormalities. The analysis program 

uses echo integration to estimate fish standing crop and densities. Echo integration is best suited 

for high density communities. Unfortunately, 87% of our transects found fewer than 200 targets,

11
the minimum needed for an integration analysis using single beam acoustic data. Because of 

these low densities, we had to find an alternate method of estimating fish densities. A 

spreadsheet macro was developed to convert the number of targets counted to number offish/ha.

Reservoirs were subdivided into habitat zones, each represented by one study station. Surface 

area (full pool) was measured from topographical maps using a digital planimeter. Standing 

crop and density values (kg-fish/ha) were multiplied by the zone's surface area (Table 2) to 

determine total kg and numbers of fish. Zone totals were tallied to develop standing crop and 

population estimates for each reservoir. Fish data were subdivided into numbers of fish larger 

and smaller than 16 cm (-40 dB) to estimate the population size of pelagic striped bass, carp, and 

walleye.

Hydroacoustic determination of plankton density was employed in an effort to provide a more 

economical and rapid means of assessing the large volumes of water. The volume back scattering 

co-efficient was used as a correlate against measured plankton biomass to determine plankton 

densities. Hydroacoustic analyses were preformed at a setting of 20 log R using the DT analyzer 

version 3.1.1. software on a PIT 450 mhz desktop computer. Analysis were stratified to 

correspond to depths used for plankton collections: 0-10 m, 10-20 m, and 20-30 m. Results were 

plotted against zooplankton biomass, density, and net plankton fractionated biomass to determine 

the best regression fit. Initial analyses were restricted to sites where fish were not present in the 

hydro-acoustic data sets to minimize potential effects to the analyses. Once regression parameters 

were determined, an attempt was made to work with samples where fish were present to 

determine the effect of fish presence on regression parameters

Target strength analyses were used to explore the distribution of individual targets measured by 

the unit. Conversion to a density per cubic meter using this technique was not really possible 

using the number of acoustic targets identified due to acoustical limitations in the ability to 

define individual targets. Zooplankton densities are typically high enough that individual 

organisms are too close together to be separated in the acoustic beam. The ability to separate 

individual targets is a function of pulse width. Based on the system used for this study 

organisms must be about 30 cm apart to be classed as individual targets. It would be expected 

that most zooplankton are much closer together than this thus individual target analyses is not 

feasible and echo-integration techniques must be employed.

RESULTS 

Zooplankton/NetPlankton/Phytoplankton

Zooplankton populations followed several trends that would be expected for a reservoir situation. 

The inflow areas typically exhibited the highest productivity; productivity decreases with 

distance downstream (Figures 3-8, Appendix C,D). This trend was apparent in Lake Mead with 

the inflow

12
Figure 3. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the water 

column in Lake Mead. November 1995, January 1996.

November 1995

0-30 t/g/L

31-60 t/g/L

61-90 t/g/L

91-120 t/g/L

121-150 t/g/L

151-180 t/g/L 

181-210 t/g/L 

211-240 t/g/L

13
Figure 4. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the water 

column in Lake Mead. May 1996 - January 1997.
Figure 5. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the water 

column in Lake Mead. May 1997 to January 1998.

15
Figure 6. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the water 

column in Lake Powell. November 1995 to January 1996.

November 1995

0-30 i/g/L 

31-60 i/g/L

61-90 i/g/L 

91-120 i/g/L

121-150 i/g/L 

151-180 i/g/L 

181-210 i/g/L

211-240 i/g/L

16
Figure 7. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the water 

column in Lake Mead. May 1996 to January 1997.

sr17
Figure 8. Seasonal and spatial distribution of zooplankton biomass in the top 30m of the water 

column in Lake Mead. May 1997 to January 1998.

November 199

18
areas of the Colorado River, Virgin River, and Las Vegas Wash being much more productive than 

the rest of the reservoir (Figures 3-5). There were occasional blooms scattered around the reservoir 

but the dominate pattern was still inflow productivity. Lake Powell, on the other, hand tended to 

have a much more random pattern of zooplankton production within the reservoir. Inflow 

zooplankton productivity was not consistently higher than in the rest of the reservoir (Figures 6-8)

Though fish densities and biomass were greater in Lake Powell, lake-wide average zooplankton 

biomass by comparison was higher in Lake Mead (Figure 9, Appendix C). Total net plankton 

biomass, however, was higher in Lake Powell in 1996 than in Lake Mead but lower during 1997 

(Figure 10, Appendix D). Small net plankton, which includes phytoplankton, made up a greater 

proportion of the plankton biomass in Lake Powell than in Lake Mead, ranging from approximately 

80% down to 60% (Figure 11).

Figure 9. Average whole reservoir zooplankton biomass (Cladocera, Copepoda, Rotifera) (wg/L) for 

Lakes Powell and Mead.

180

160 -

140 -

120 -

JS 100 -

Nov-95Jan-96May-96Aug-96Nov-96Jan-97May-97Aug-97Nov-97Jan-98

Date

During the summer months in Lake Mead the proportion of small plankton was higher, but for the 

remainder of the year the community was dominated by larger size classes. Lake Powell showed 

a significant trend toward a shift to larger plankton during the course of the study, and subsequently 

a decrease in phytoplankton volume with increased grazing pressure (Figure 12). This correlates to 

continually decreasing shad populations in the lake and observed shifts may be a response to 

decreased grazing pressure. In Lake Mead, high zooplankton populations in Boulder Basin are an 

indicator of the influence of Las Vegas Wash. There were several exceptions to the rule, however, 

as are shown in the pictorial graphics. Local blooms could appear at any site though several sites 

seemed more common. Blooms were typically ofDaphnia sp. in both reservoirs. Cladocerans as

19
a percentage of total plankton biomass were the dominant zooplankton at almost all times in both 

reservoirs. On a numerical basis copepods were more common than cladocerans. Rotifers were 

variably dominant in terms of numbers, but made up a relatively insignificant proportion of total 

zooplankton biomass in either reservoir.

Figure 10. Average total lake-wide net plankton biomass (wg/L) for Lake Powell and Lake Mead.

140

120 -

100 -

80 -

60 -

~m 40 

o

20 -

Nov-95 Jan-96 May-96Aug-96Nov-96 Jan-97 May-97Aug-97Nov-97 Jan-98

Date

Figure 11. <500 um size class as a percentage of total net plankton biomass inn Lake Powell and 

Lake Mead

0.9

O 0.8 

5

0.7 

0.6 -

5 0.5

o

o

O)

I 

o>if

v

Q.

0.4 

0.3 

0.2

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20
Figure 12. Average lakewide phytoplankton cell density in the top 30 m of the water column for 

Lake Powell and Lake Mead.

3e+5

 jk,

& 

c/i

CD 

Q

"55 

O

CD 

CD

3e+5 -

2e+5 -

2e+5 -

1e+5 -

D) 5e+4

CO

Nov-95 Jan-96 May-96 Aug-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

Generally relatively poor correlations existed between fish densities and zooplankton on a site to site 

basis, however, across years we do see a gross relationship between fish, zooplankton, and 

phytoplankton.. This is not unexpected given the dynamic nature of these reservoirs, and substantial 

differences in patterns of productivity across reservoir reaches. Fish densities in much of the 

reservoir are relatively low and as such may not exert much influence over pelagic plankton 

populations at all sites. This may represent a cascading effect where striped bass keep shad 

populations low enough that their influence on plankton populations remains minimal. However, 

there are probably other equally important factors such as climate and spawning success and habitat 

suitability for fish that are equally if not more important in determining shad presence than just 

predation affects.

Patterns of seasonal plankton abundance varied widely between sites on each reservoir. Some 

similar trends, however, were observed. Depth distribution of zooplankton was strongly a function 

of season. During cooler periods such as during January the majority of zooplankton biomass was 

located in the top 10m of the water column (Figure 13). As the season progressed, the center of 

biomass distribution moved deeper into the water column. In August most zooplankton biomass was 

located below 20 m. This has ramifications when comparing data sets collected over the years in 

these reservoirs. Apparent cycles in zooplankton populations may be present simply as a function 

of sampling technique. Additionally, on a diel basis there was substantial vertical movement of

21
larger bodied zooplankton. This was most notable during the summer months. During daylight 

hours zooplankton biomass was concentrated in deeper water moving very quickly up to shallower 

depths after dark (Figure 14). This observation was not noted during winter periods and the majority 

of plankton was located in the top 10m of the water column.. Diel migrations may be an escape 

from predation pressure as well as an energetic response to warm surface waters.

Figure 13. Seasonal vertical distribution of zooplankton biomass at station PI (upper graph and at

250

200 -

150 -

2. 50 -

Nov-95 Jan-96May-96Aug-96Nov-96 Jan-97May-97Aug-97Nov-97Jan-E

Date

400

300 -

200 -

0 -

Nov-95 Jan-96M ay-96 A ug-96 N ov-96 Jan-97 M ay-97Aug-97Nov-97Jan-98

Date

Ml, Lower graph).

22
Figure 14. Diel vertical migration of zooplankton in Lake Powell during August.

Fjfc Urn Qbipliy 7ii»i».j hn Cniijjnic Wiiiln, Hdf t Filr Vhr D'c-pliy 7i»in«J $m Ciiityuc WMw Help

^^^t^^^^^f^^^^^^i^-

10:00pm

90 dp or .5 rBi size Sensitivity)

Surface

10m

20m

30 m

Seasonal patterns of zooplankton abundance showed different patterns depending on whether 

biomass or density were used to examine trends. This was a function of which groups and size 

classes of individuals were dominating the planktonic community during different seasons. 

Typically spring peaks in numerical abundance were dominated by increases in rotifers and 

copepods (Appendix C). Copepods, in particular, showed the largest numerical density changes 

typically peaking in May of each year, which corresponds to the time of highest reservoir 

productivity and is just at or prior to the onset of stratification. There was again a late fall peak 

associated with increased mixing resulting from the decay of thermal stratification. This pulse of 

productivity was not as pronounced as the spring bloom and further was more variable between sites 

in both reservoirs though the trend was for larger blooms to occur near inflow areas.

Seasonal patterns of net phytoplankton (phytoplankton entrained in a 64wm net) were quite 

pronounced, as would be expected (Figure 12, Appendix E). Seven major groups of net plankton 

were recognized in this study bacillariophyta, cryptophyta, chrysophyta, chlorophyta, cyanophyta, 

dinophyta, and euglenophyta. Generally only the larger genera in these groups are included in the 

data. Because our samples represent only net phytoplankton, a substantial portion of phytoplankton

23
biomass is being ignored in this study. Appendices do not show data for cryptohyta and 

euglenophyta, as although they were occasionally collected cryptophytes especially, are much to 

small to be effectively entrained in our net.

In general for the two reservoirs, diatoms and blue-greens and chrysophytes were the numerically 

dominate groups. Diatoms tended to peak in January and May, while blue-green dominance was 

typically in August thru November. Chrysophytes tended to be dominant only during the May 

sampling trips.

Overall Powell had higher densities of phytoplankton than Lake Mead for much of the study. The 

vast majority of the difference was attributable to higher densities of Blue-green algae in Lake 

Powell than Lake Mead. Productivity of phytoplankton in Lake Mead increased with distance 

upstream from the dam, and was also high in Las Vegas Bay. A similar trend was also observed for 

Lake Powell. General seasonal trends were apparent for all groups of algae in both reservoirs. Much 

of the year to year variation is probably due to a combination of predation effects and climate, 

neither of which this study was designed to separate out. Differences in timing of blooms between 

the reservoirs is also attributable to location. Although both reservoirs are at similar latitudes, Lake 

Powell is significantly higher in elevation. This means it does not have as high a maximum 

temperature, and tends to have a shorter growing season. Strong stratification develops later and 

ends sooner.

Zooplankton Acoustics

The objective of hydro acoustic determination of zooplankton abundance was to determine if a 

significant relationship existed between zooplankton biomass and acoustic backscatter. Acoustical 

work with zooplankton, particularly in marine systems, has been ongoing for many years. For larger 

species such as Euphasids, acoustical relationships are quite robust (Greenlaw 1979). Freshwater 

applications, however, are fairly rare and the technology, although accepted, has not seen wide 

spread application. One advantage of digital acoustic systems (by digital we refer to the data being 

digitized at the transducer not at the surface unit) is the almost complete lack of noise associated with 

the system. Depending on setup, analog transducers are often subject to external noise such as 

outboard motor or generator operation, and other interference picked along the length of the cable. 

Our goal was to determine if with standard settings, we could obtain a reasonable estimate of 

plankton biomass in the reservoir. For the purposes of this study we did not try any alternative 

means of data analysis. The use of a standardized settings is desirable as it provides a level of 

uniformity and a means of direct comparison between data sets. Even if standardized settings are 

not possible, data collection still allows some gross spatial analysis of trends in plankton spatial 

abundance.

Acoustic target distribution within the reservoirs for most seasons shows a distinct break between 

fish and zooplankton for data analyzed down to a threshold of -90 dB. Plots of target strength 

distribution for fish show a drop off in target numbers at around -60 dB, with the majority of the fish 

targets being larger. Likewise with zooplankton -60 dB represents the upper end of targets observed,

24
with the majority of targets in the -70 dB to -80 dB range (Figures 20-22). Zooplankton data were 

analyzed with an upper limit of-60 dB and a lower limit of-90 dB. For the analysis presented here, 

we did not make any modifications to the default programs provided by the manufacturer.

Hydroacoustic analysis of zooplankton communities in Lake Mead for January 1988, produced 

results similar to those for standard net sampling, indicating the utility of this approach to large scale 

studies of gross biomass distribution (Table 3 ) (Figures 15,16). For analyses presented here we 

made no attempt to remove fish targets from the data. Unfortunately, however, the presence offish 

sharply reduced our ability to acoustically determine zooplankton abundance. Often times, fish were 

not commonly encountered in the top 10m of the water column during daytime acoustic runs, and 

thus represented no real analysis problem. In August, however, there was significant overlap in the 

size distributions of zooplankton and shad. This was due to the large populations of small shad 

present. Since we correlated zooplankton abundance against volume backscattering, fish targets 

biased this number upwards. Bias can be quite significant because for a given size target a fish 

tends to produce a much higher backscatter than a zooplankton. As figures 15 and 16 show very 

large backscattering values (-db) are associated with plankton levels that are much lower than 

expected given relationships determined during January. As is expected, with the inclusion of some 

fish, samples in August were biased on the high side with respect to estimation of zooplankton 

biomass (Table 3, Figures 15,16). Variability in fish densities and normally low populations of 

larger zooplankton genera at this time of the year combined to produce acoustic data with limited 

applicability.

One important aspect of making acoustic sampling applicable is the importance of repeatability. 

That is, sampling one date should give a similar relationship between enumerated and acoustic data 

as it does for other dates and locations (Morton and MacLellan 1992). Without this consistency, 

calibration to an enumerated plankton data set would be required for each trip. As indicated 

previously fish are known to interfere with estimates of plankton biomass. We further noted 

substantial seasonal differences within and between the two reservoirs. Finally, correlations between 

acoustic backscatter and plankton density differed between the two reservoirs. We attributed 

differences to be primarily as a result of differences in the plankton community composition 

between the two reservoirs. For Lake Mead , the highest correlations were between zooplankton 

biomass as determined by counts and acoustic backscattering (Table 3, Figures 15,16). For Lake 

Powell, the strongest correlations were found for total filtered plankton biomass (Table 3, Figure 

16).

Regressions using enumerated zooplankton biomass for Lake Mead likely provided the highest 

correlation, as larger bodied cladocerans and copepods, which are within the detection limits of the 

sampling gear, make up the majority of the total plankton biomass in that reservoir. Other net 

plankton were a much smaller percentage of the total (Figure 11). In Lake Powell, on the other hand, 

smaller net plankton and algae made up the majority of the plankton biomass (Figure 11). Since 

volume backscattering for smaller organisms is less that for larger organisms, changes in abundance 

of smaller organisms will be less sensitive to acoustical determination than changes in populations 

of larger size planktors. Many plankton are probably below our acoustic threshold and fairly large

25
changes in numbers from site to site have little impact on the acoustic signal. Since these numbers 

were not reflected in total counts (we used a 64 um net) the regressions using them were inadequate.

In general, when reservoirs were dominated by larger bodied zooplankton, hydroacoustic estimates 

were more tightly correlated to zooplankton biomass. During the January and May sampling periods 

Lake Mead was heavily dominated by larger plankton, and regressions produced the best results for 

these sampling periods. Lake Powell, on the other hand, contained a large number of smaller 

plankton, which undoubtably decreased the resolution of the regressions. With low densities, and 

dominance by smaller bodied species, our measurements may be more a function of background 

noise then the acoustic unit actually being able to see the plankton (McNaught 1968,1969). We do 

no our net sampling is biased against smaller plankton (those that pass through the net), thus we 

underestimate the total biomass present. Phytoplankton cell densities tended to be higher in August 

and November, many of which are smaller than 64 um, and may have contributed towards a decrease 

in the utility of regressions developed for those time periods. Careful analysis of background noise 

should be done and then an attempt made to subtract this from the data prior to analysis. May and 

January, the months producing the best regressions, were two months that tended to have the lowest 

net plankton cell density.

26
Table 3. Regression Coefficients for zooplankton biomass as a function of volume acoustic 

backscatter in the 0-10m depth range.

b(0) b(l) r2 b(0) b(l) r2

0-10m 10-20m 

Lake Mead

Filtered Biomass

November 1997

August 1997 

May 1997 

January 1998

Enumerated Biomass

November 1997

August 1997 

May 1997 

January 1998

Lake Powell

Filtered Biomass

November 1997

August 1997 

May 1997 

January 1998

Enumerated Biomass

November 1997

August 1997 

May 1997 

January 1998

8.34

0.97 

6.98 

10.8

5.88

-2.52 

7.81 

14.64

7.116

5.32 

10.52 

10.04

7.56

-0.28 

9.088

7.79

0.047

-0.03 

0.027 

0.08

0.016

-0.07 

0.039 

0.13

0.039

0.015 

0.074 

0.071

0.043

-0.05 

0.056 

0.034

0.367

0.069 

0.511 

0.535

0.041

0.216 

0.789 

0.864

0.384

0.029 

0.488 

0.413

0.147

0.288 

0.283 

0.125

1.81 -0.02 0.27

4.05 -.00003 0.001

7.66 0.030 0.352

4.71 0.01 0.024

-2.83 -0.07 0.68

3.39 -0.01 0.118

8.94 0.04 0.499

0.98 -0.02 0.213

3.77 7.26 0.123

4.10 3.29 0.016

5.96 0.018 0.109

-12.67 -0.15 8.39

0.019 -0.03 0.402

1.784 -0.017 0.113

0.128 -0.04 0.125

3.57 8.45 0.063

27
Figure 15. Correlation between filtered and enumerated zooplankton abundance for Lake Mead for 

the 0-1 Om and 10-20m depth strata.

CO 

CO 

(TJ

O

CD

c 

-I o

-*

c jo

Q.

o 

o

N

e2 -

Mead 

Filtered (0-1 Om)

o o

Filtered (10-20m)

»6 .

12 P5 .

»4 .

a2 -

-100 -90 -80 -70

Enumerated (10-20m) A

-100 -90 -80 -70 -60 -50 - 120 -110 -100 -90 -80 -70 -60

-50 -120 -110 -100 -90 -80 -70 -60

Volume Backscattering (db)

28
Figure 16. Correlation between filtered and enumerated zooplankton abundance for Lake Powell 

for the 0-1 Om and 10-20m depth strata.

e' -

es -

o>

Lake Powell 

Filtered (0-1 Om)

| -110 -100 -90 -80 -70 -60

&e' 

o

N

Enumerated (0-1 Om)

-110 -100 -90 -80

es -

e^ -

Filtered (10-20m)

 November 1997

O August 1997

A May 1997

<j> January 1998

-50-130 -120 -110 -100 -90 -80 -70 -60

e° -

Enumerated (10-20m)

-70 -60 -50 -130 -120 -110 -100 -90 -80 -70

Volume Backscattering (db)

-60

29
Patchiness in zooplankton distributions further played a critical role in accuracy of our acoustic 

estimates. As shown using a hydroacoustic diagram, zooplankton distribution within a transect is 

extremely variable (Figure 17). Our sampling consisted of two-plankton tows, typically one at either 

end of the transect. Samples were then pooled and enumerated. As can be seen in the diagram there 

are regions in the water column almost devoid of an acoustic signal from plankton. If we were to 

happen to do a plankton tow through this reach, and then try to correlate to an acoustic transect that 

was averaging over many hundreds of meters, it is not difficult to imagine why discrepancies might 

arise due to sampling at different scales (Kelley 1976). If, on the other hand, we are interested in the 

scale of this patchiness, a raw acoustic output such as the one shown is probably an ideal exploratory 

method. This would be of value in looking at patchiness of potential planktivorus fish food across 

a large basin, and may be utilized in studies to explain aggregations of fish. Plankton are affected 

by currents, often tending to windrow on one side of a basin. The graph presented here likely reveals 

the impacts of langmuir circulation in the lake. This transect essentially cut perpendicular to the 

long direction of the cells. The areas of high concentration are the downwelling areas between cells.

30
Figure 17. Spatial distribution of zooplankton in Warm Creek Bay, Lake Powell. Picture on the left 

is the echo-trace generated by the hydroacoustic gear. The picture on right is a graphical 

representation of differences in relative zooplankton densities, with the darker shaded regions 

representing higher densities.

31
Vertical Gill Nets

Sampling produced a total of 449 fish representing 6 species (Table 4). Relatively few fish were 

captured, so the samples were combined for both years to derive species composition. A total of 

240 striped bass, threadfm shad, carp, walleye, and channel catfish were captured in Lake Powell. 

Lake Mead produced 209 fish with the addition of rainbow trout and the absence of walleye. The 

catch was dominated by striped bass (44-57%), threadfin shad (24-50%) and carp (7-15%). The 

other three species represented less than 5% of the catch. No centrarchids or native species were 

captured. Specific information pertaining to lengths and weights is provided in Table 5 and 

Appendix F.

Table 4. Species composition of fish captured by vertical gill nets in Lake Powell and 

Lake Mead from November 1995 through January 1998.

Species

Striped bass (Morone saxatilis)

Threadfin shad (Dorosoma petenense)

Carp (Cyprinus carpio)

Channel catfish (Ictalurus punctatus)

Walleye (Stizostedion vitreuni)

Rainbow trout (Oncorhynchus mykiss)

Totals

Lake Powell

136 (56.7%)

57 (23.8%)

36 (15.0%)

4 (1.6%)

7 (2.9%)

0

240

Lake Mead

93 (44.5%)

105 (50.2%)

7 (3.3%)

3 (1.5%)

0

1 (0.5%)

209

Initially we planned to set vertical gill nets at six Lake Powell sites (P04, P05, P07, P09, P10, PI3) 

and five Lake Mead sites (M03, M05, M08, M10, Ml 1). The number of sets were gradually reduced 

to 3 sites on each reservoir due to poor catch rates and logistics. Lower basin sites where we caught 

few, if any fish, were discontinued in favor of more productive areas. The sites commonly sampled 

on Lake Powell were Oak Canyon (P05), Piute Bay (P07), Rincon (P10), and Good Hope Bay 

(PI3). On Lake Mead, nets were set at Callville Bay (M04), Gregg Basin (M08), and the upper 

Overton Arm (Mil).

Some net samples were missed due to bad or threatening weather. Vertical gill nets were difficult 

to set or retrieve when it was windy, a condition which was quite common in spring and summer. 

We also had a couple of instances when nets were not set because of abnormally high recreational 

boat traffic and safety concerns.

Small threadfin shad dominated the fishery but they represented a relatively small percentage (24 

-50%) of our catch. Small fish would simply swim through our nets and were more difficult to

32
capture. Gill netting is accepted as being fish-size biased (Boxrucker 1995), providing more 

indicative information on larger fish. We also, on occasion, captured large striped bass by their 

mandibles in the small meshed (1.2 cm) nets. This led us to suspect they were captured indirectly 

as they were picking shad out of our nets. We felt the net data most accurately described the 

composition offish >16 cm. Gill netting in Lake Powell suggests 74.3% of the fish >16 cm were 

striped bass compared to 89.4% in Lake Mead.

Table 5. Average lengths, weights and ranges offish captured from Lake Powell and Lake Mead 

from November 1995 through January 1998.

Species C. Catfish Carp TF Shad Stp. Bass Walleye RB Trout

Lake Powell

Avg. TL (mm)

Maximum

Minimum

Avg. Weight (g)

Maximum

Minimum

#Fish

Lake Mead

Avg. TL (mm)

Maximum

Minimum

Avg. Weight (g)

Maximum

Minimum

#Fish

285

350

155

202

330

34

4

338

420

285

384

540

228

3

470

575

410

1,342

2,100

860

36

453

473

422

1,149

1,330

986

7

103

155

86

9

32

4

57

115

195

85

15

60

4

105

467

622

165

1,259

2,300

36

136

409

772

218

765

2,230

100

93

422

503

268

961

1,400

640

7

0

0

252

320

1

Fish Analysis

The single-beam echosounder was used until August 1996 when the system was upgraded to dualbeam. We experienced both software and hardware problems during our November 1996 and 

January 1997 field trips which interrupted data collection. Data acquisition resumed in»May 1997, 

resulting in the completion of 8 field surveys that generated 750 transect files amounting to more 

than one gigabyte of acoustical data.
There was one additional glitch we discovered during data analysis. The configuration defaults of 

the DT-4000 and DT-5000 were different for the 1996 and 1997 data sets. The single-beam system 

used a linear type data thresholding (1/R) while the dual beam provided a squared type (1/R2) 

(BioSonics 1998). This basically meant fish estimates derived from the single-beam were slightly 

more conservative than those measured by the dual beam.

We experienced minor problems with bad weather, equipment failure, and field conditions. Gas 

bubbles proved to be a problem in the inflow areas. Organic sediments decompose, generating 

methane and hydrogen sulfide gases. Unfortunately, the reflective characteristics of a single bubble 

is identical to that of a fish swim bladder, making it virtually impossible to distinguish them apart. 

However, in some instances, bubble vents generated a conspicuous bubble column (Figure 18). In 

these instances, they could be distinguished from fish and be removed from the analysis. 

Unfortunately, we had instances where this problem was simply too severe to allow fish analysis.

Bubbles were so prevalent at Zahn Bay that we moved P08 further downstream to Spencer's Camp.

We also experienced minor bubble problems at M02, and M09.

There were instances where bubbles were entrained into the water column by wave action. Wave 

induced turbulence forces air into the water column. Data analysis typically was started at a 1 m 

depth, however, under windy field conditions the analysis was started at 2 m to reduce the likelihood 

of including bubbles in the fish density estimates.

Figure 18. Echogram illustrating bubble plumes caused by sediment gas generation.

34
Standing crop estimates peaked after spawning for both years, but these values are probably 

conservative due to our inability to detect fish within 1 m of the surface and possible boat 

avoidance. During warm months, and especially at night, fish were typically found near the surface 

feeding. On extremely calm nights, fish were often seen attempting to avoid the boat. This behavior 

and its possible bias are recognized but have never been quantified. In addition to boat avoidance, 

the system has a "blind spot" near the surface. The echo-sounder can not detect fish within 50 cm 

of the transducer which is typically at a depth of 50 cm. Thus, we simply could not detect fish found 

within 1 meter of the surface. These two factors were undoubtedly more of a factor for summer 

surveys conducted at night.

Acoustical Analysis Techniques - There are two standard methods of analyzing acoustic data; echo 

integration and echo counting. Echo integration provides the best method of estimating fish biomass 

for schooling species or for high density communities. Fish densities are estimated by adding 

together the total amount of energy reflected back by all targets and dividing it by the average target 

strength. Target strength is either measured (dual-beam), estimated (single-beam), or selected by the 

analyzer. However, when there are few fish (</200 targets), the ability of the single beam system 

to predict or measure target strength (body size) is biased because of the large number of targets 

needed to estimate average target strength. Conversely, the dual-beam accurately measures target 

strength, but due to differences in target orientation a large number of targets are needed to minimize 

aspect related bias.

In the preliminary analysis, we discovered 72% of the Lake Powell's 299 transects and 92% of Lake 

Mead's 242 files had fewer than 200 targets which prevented us from determining fish size. The 

biosonics analysis program requires 200 to 500 targets to calculate an average sigma or average 

target strength. The average sigma, or fish size, is critical to determine fish densities.

We used the default settings for fish size (22.4 cm) to maintain analysis continuity. Low detection 

numbers did not effect biomass measurements, however, the resulting fish density output figures 

are artificial since the average fish size was arbitrarily set rather than measured.

To improve these density estimates, an echo counting program was written to calculate fish densities. 

Transect data were re-analyzed using output data generated by the Configure Target Strength mode 

which predicted (DT-4000) or measured (DT-5000) target (fish) size for all files. The resulting data 

summary files were subjected to an echo counting procedure using a FORTRAN program. This 

echo counting procedure is best suited for low-density communities where single-target recognition 

is high.

Target Strength Distribution - Target strength distribution was examined to determine the 

appropriate analysis threshold which would separate small fish from plankton for both reservoirs. 

This analysis was conducted on 1996 and 1997 zooplankton data collected at M02, M09, Mil, P03, 

P08, and P14. Data were acquired at a threshold of -90 dB and analyzed for targets found between 

a range of-40 and -80 dB, representing a target size of 16 cm to 5 mm.

35
Based on Love's equation (1971) and similar regression research (MacLennan and Simmonds 

1992, Fleischer et al. 1997) the size break between small fish and zooplankton appears to fall 

between a -60 and -65 dB threshold. Numerically, zooplankton dominates the aquatic community 

so a significant increase in target numbers would be expected as we encroach into that target size 

regime.

Table 6. Total fish lengths (cm) for dorsal aspect target strengths (-dB) for 430 kHz echosounder.

Decibels (-dB) -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 

Length (cm) 51.2 28.9 16.3 9.2 5.2 2.9 1.6 0.9 0.5 0.3

-80 -85 -90 

0.2 0.1 0.05

Figure 19 illustrates fish production in Lake Powell during August 1996 and shows a substantial 

overlap in the -60 to -65 dB range. Some of these targets may represent the macro-zooplanktor 

Leptidora and/or production of threadfm shad through late summer. Threadfin shad can spawn in 

late summer, even during their first year (Johnson 1971).

Figure 19. Target strength distribution (-40 to -80 dB) in Lake Powell during August 1996 

a single-beam echosounder.

o>E>

0 

-40 dB

l I i I i i r 

-50 dB -60 dB

Target Strength

-70 dB -78 db

36
Figure 20. Target strength distribution (-40 to -80 dB) in Lake Mead during August 1996 using a 

single-beam echosounder.

600

500

400

=» 300 4-1

TO 200 

100

0 

-40

i i i i i i i i r i i i i i i i i i i 

dB -50 dB -60 dB -70 dB -78 db 

Target Strength

Figure 21. Target strength distribution (-40 to -80 dB) in Lake Powell during August 1997 using 

a dual-beam echosounder.

0 

-40

i i i i i i i ii 

dB -50 dB -60 dB -70 dB 

Target Strength

i i 

-78 db

37
Figure 22. Target strength distribution (-40 to -80 dB) in Lake Mead during August 1997 using a 

dual-beam echosounder.

100

-50 dB -60 dB -70 dB -78 db 

Target Strength

In contrast, Figures 20, 21, and 22 show a sharp drop in target numbers at the -65 dB range. These 

might be more typical of a bimodal target strength distribution showing fish and zooplankton. Fish 

size (>-60 dB) targets are totally absent from two transects (P03 and M02) in 1997.

Examining the August 1997 zooplankton data (-90 dB) for fish suggested that nearly 50% of the 

targets detected fell between the -60 and -65 dB threshold (Figure 23). It appears a -60 dB threshold 

may detect adult and larger juveniles, making it appropriate for the January, May, and November 

surveys but it missed small young-of-the-year (YOUNG-OF-THE-YEAR (YOY)) fish during late 

summer and was thus too conservative. For future studies we would recommend that all data be 

collected at a minimum acquisition threshold of-70 dB.

38
Figure 23. Target strength distribution (-40 to -80 dB) for August 1997 transects collected at Lake 

Powell.

25 -i 

20

15

010

s*

5

0 

-40 -60 dB

Target Strength

Standing Crop Estimates - Length/weight regressions were developed for fish captured by gill nets 

and used to check software analysis parameters estimating biomass based on fish length. The default 

of the analysis program uses an average fish length default of 22.4 cm (100 g) to estimate densities. 

Our length-weight regression for Lake Powell (r2 =0.988) showed a 224 mm fish weighed 102.7 g 

while the Lake Mead regression (r2 =0.985) showed a slightly smaller fish at 99.6 g. Measurements 

for both reservoirs were pooled and the resulting regression (r2 =0.988) predicted an average 224 mm 

fish to weigh 101.0 g. The programs default of 100 g was used for the analysis and in essence, 1 fish 

= 0.1 kg.

The analysis produced summary output files (CSV) for each analysis run. These files are named 

using eight characters that identified the reservoir, sample site, transect, and date. The first character 

designated the lake (M=Mead/P=Powell), the second and third the study site (01-14), the fourth the 

transect (A, B, C), the fifth and sixth the month, and seventh and eight, the year. For example, file 

P02ANO97.CSV represents a file collected from Lake Powell (P), study site 2 (02), transect A (A), 

during November 1997 (NO97).

Data were analyzed in five (echo-counting) and 10m (echo-integration) depth increments. These 

strata were further divided into five vertical zones. Fish densities and biomass per surface area (fishkg/ha) were calculated and averaged to provide a transect value. The three transect values were 

averaged and 90% confidence limits were calculated for each of the 25 study stations.

39
Standing crop (kg/ha) was variable, and influenced by schooling behavior, contiguous distribution 

patterns, location, and seasonality. The highest rates occurred after spawning in August and lows 

typically occurred just prior to spawning (May). Typically the August values were at least a 

magnitude greater, then spring measurements. The highest measurement (709 kg/ha) for Lake 

Powell was recorded at the Colorado River inflow while the Lake Mead high (292 kg/ha) occurred 

in Las Vegas Bay (Table 7).

Pelagic standing crop estimates were calculated by multiplying the study site values (kg/ha) by their 

respective surface area. Surface areas of each reservoir zones (Lake Powell n= 14/ Mead n= 11) were 

tallied to provide total reservoir values (Appendix G). Pelagic standing crop in Lake Powell ranged 

from 453,097(±577,365) kg in May 1996 to a study high of 10,852,738 (± 5,195,556)kg in August. 

Biomass values in 1997 were collected at a higher threshold (-60 dB) which partially explains the 

decrease to 162,262 (±209,064) kg in May and 2,228,942 (+1,324,614) kg in August (Figures 24 

and 25).

Figure 24. Pelagic fish biomass (CL=90%) of Lake Powell measured quarterly from November 

1995 through January 1998.

16

14

12

8

4

2

_

Nov Jan May Aug May Aug Nov Jan 

1995 1996 1997 1998

40
Table 7. Kilograms of fish biomass per surface hectare (90% =Conf. Limits) measured in the 

pelagic zone (>20 m) of Lake Powell and Lake Mead from November 1995 through January 

1998 using echo integration.

§ite 100* / 1004; /

Nov

Lake Powell

P01 0.1 (0.2) 

P02 0.1 (-)

P03

P04

P05

P06

P07

P08

P09

P10

Pll

P12

P13

P14

OAK

--(-)

10.2(5.1)

20.5 (13.4)

4.6 (6.2)

132.3 (37.6)

--

6.5 (4.8)

59.3(17.1)

91.3(78.1)

204.5 (90.5)

403.3 (266.0)

295.7 (148.8)

~

EV AN 26 1.2

WCk.

RING

.

59.0

Feb May

7.2(12.3) 24.2(21.0) 

3.8(8.1) 2.3 (1.9)

63.8(15.7)

4.4 (4.5)

13.8(12.9)

63.3 (98.5)

~(-)

~(-)

24.4(1.1)

3.0(1.6)

185.7(142.2)

15.3 (3.7)

10.2(4.7),

41.5 (11.4)

2.5

15.9

~

10.7 (4.4)

4.1 (2.9)

3.1 (2.1)

5.5 (7.9)

1.2(0.5)

0.8 (0.5)

5.2 (4.9)

1.3(1.3)

11.6(15.1)

2.8 (2.7)

10.1 (9.8)

16.4(9.1

39.2

17.9

7.9

0

/

Aug

136.4(21.6) 

21.3 (9.5)

172.2 (48.8)

78.2(15.7)

80.0 (14.6)

170.6(36.1)

54.2 (6.7)

240.1 (61.7)

132.9(4.6)

272.3 (46.3)

33.7 (20.5)

316.4(223.9)

344.2 (55.2)

709.7 (46.5)

255.7

537.0

, _ 1 0O7__.

May

0 (-)

1.9(0.6)

1.2(2.1)

0.5 (0.7)

0.4(0.1)

1.0(0.7)

 / /1QQ£ 1 yyo 

Aug Oct Jan

0.5 (0.4) 0.9 (-) 4.0 (4.3) 

1.7(1.9) 0.1(0.1) 0.6(0.6)

2.7(1.1) 11.2(9.2)

1.1 (0.9)

3.1 (3.1)

1.2(1.4)

0.2 (0.3)

1.2(0.7)

1.3(1.2)

4.5 (3.7) 107.5(76.3)

1.9(1.3)

0.5 (-)

0.2(0.1)

0.9 (0.5)

4.6 (0.8)

2.3 (0.5) 162.0 (121.0) 59.7(1 1.1) 10.5 (5.5)

4.6(1.1)

0.5 (0.3)

0.2 (0.0)

11.8(5.8)

10.5 (7.6)

1.6(1.7)

5.7 

0.1

2.5

0.4

4.6 (6.3)

9.4 (-)

24.9 (8.9)

1.2(0.8)

1.0(0.5)

6.0 (2.9)

38.1(30.0) 25.4(12.9)

1.5(0.6)

1.3(0.4)

1.6(2.0)

2.2 (0.5)

98.5(22.4) 26.4(14.2) 12.2(6.1)

366.4 (33.3)

0.2

~

81.9

~

61.1(31.6)

~

~

~

~

5.1 (3.5)

~

~

~

Lake Mead

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

Mil

LVB

O(-)

29.9(10.2)

0.4 (0.6)

0.8 (0.7)

0.6 (0.8)

0.6 (0.8)

1.2(0.7)

39.3 (56.4)

22.7 (25.0)

1.5(2.0)

51.9(16.4)

~

1.5(1.0)

65.7(10.0)

0.2 (0.3)

0.5 (0.7)

0.1 (0.2)

0.1 (0.0)

2.9(1.2)

8.6 (0.7)

4.8(4.1)

0.8 (0.3)

9.8 (2.9)

16.7

4.0 (4.4)

16.1 (10.9)

1.9(2.1)

3.5 (0.5)

1.9(1.5)

0.6 (0.4)

2.6(1.9)

1.2(0.8)

30.9(11.0)

1.0(0.9)

5.9 (2.4)

0.1

27.5 (8.2)

62.0(31.6)

31.5(16.9)

30.1 (27.4)

4.2(3.1)

15.4(8.1)

7.3 (0.7)

27.7 (5.8)

82.2(2.0)

5.6 (2.8)

13.0(2.6)

624.9

0.5 (0.8)

8.6 (6.7)

0 (0.0)

0.2 (-)

0.1 (-)

0.1(0.1)

0.4 (0.4)

1.6(0.8)

11.1 (8.8)

2.1 (2.5)

1.8(0.1)

~

53.0 (2.7)

291.9(58.2)

3.8 (1.3)

41.0(32.0)

3.3 (2.3)

2.0(1.5)

6.7 (5.9)

21.8(0.9)

81.9(58.8)

2.8 (2.4)

4.7 (2.5)

991.0

0 (-)

16.9 (23.0)

0.1 (-)

0.2 (0.3)

0.1 (-)

0.9 (0.9)

5.3(1.7)

17.0 (3.9)

41.4(13.7)

0.1 (-)

9.6 (5.0)

0.1 (-)

2.9 (0.4)

0.5(0.1)

0 (-)

0. 7 (0.9)

0.1 (-)

1.2(0.8)

4.4(1.1)

9.4 (5.6)

~

0.6 (0.6)

19.3

41
3 

2.5

1

0.5 

0 I - 

Nov Jan May Aug May Aug Nov Jan

1995 1996 1997 1998

Figure 25. Pelagic fish biomass (CL=90%) of Lake Mead measured quarterly from November 1995 

through January 1998.

Seasonal and annual trends were similar in Lake Mead. Standing Crop measurements taken during 

May and August representing the low and high months and overall production was slightly higher 

in 1996. Total reservoir biomass was 296,736 (+288,102) in May and 1,926,697 (±892,994) in 

August 1996. Values in 1997 also declined from 1996 levels; 101,016 (±122,768) kg in May and 

1,454,778 (±948,763) kg in August (Figure 25).

Fish Distribution - The data base contains information pertaining to daily and seasonal migrations. 

Fish moved vertically and laterally within the water column on a hourly, daily, and seasonal basis. 

During the summer on bright sunny days striped bass and threadfin shad typically schooled just 

above the thermocline at depths between 20 and 30 m (Figure 26). It's suspected that the primary 

parameters that may influence distribution are light intensity, water temperature, predation pressure, 

and food availability. In late afternoon into the evening, schools would migrate toward the surface 

(Figure 27).

In late fall and early winter, thermal gradients weaken and fish migrate from shallower to deeper 

habitats. Fish densities continued to remain relatively high at the inflow areas, however, they did 

gravitate toward pelagic habitats that were at least >40 m deep. Here they were often found 

associated with the bottom, but at night they would rise and disperse throughout the water column 

to feed. Large numbers offish migrated further downstream to deeper habitats (>100 m) where they

42
often concentrated in stratified zones at depths >50 m. Fish appeared to prefer major side canyons 

or tributary arms rather than the mainstem channel in Lake Powell. Figure 28 shows an echogram 

taken in the Escalante Arm of Lake Powell during the January 1998 survey where we detected high 

concentrations of fish between 50 and 60 m. We did not detect any appreciable difference in 

temperature (+0.25 °C), however, conductance was slightly higher in this strata.

Geographically, fish distribution was skewed toward inflow and nursery habitats while specific 

densities were influenced by season, reproductive success, and habitat conditions. In actuality, each 

reservoir contained three unique and separate pelagic fisheries that were isolated by a region of low 

productivity. Fish biomass (total kg) in Lake Powell was concentrated at the Colorado River inflow 

area (45-75%=P14, P13, P12), upper San Juan Arm (6-15% P08, P07), and Warm Creek (0.9-21%= 

P03) (Figures 29 and 31). Annual fish biomass peaked in August at these three areas and by late fall, 

early winter, fish moved further down-reservoir to over winter in deeper habitats (PI 1-PI3, P07).

Distribution on Lake Mead was similar. The three highly productive areas were found at Las Vegas 

Wash (10-59%=M02), upper Overton Arm (4-57%=Mll), and the Colorado River inflow (14- 

59%=M09, M08) (Figures 30 and 32). Production in Las Vegas Bay (M02) appeared fairly 

consistent from 1996 to 1997, however further up lake we witnessed fairly dramatic shifts in fish 

biomass. In 1996, the Overton Arm supported the majority (total %) of reservoir wide fish biomass 

while in 1997 production shifted toward the Las Vegas Wash (M02) and Colorado River inflow area 

(M09). Standing crop offish in the Virgin Basin (M05) remained relatively low for both years.

Figure 26. A daytime echogram taken August 1997 on Lake Powell showing fish schools 

concentrated near the reservoir's thermocline.

Lake Powell 

August 1997

43
Figure 27. A night echogram showing fish dispersal within the top 20 m of the water column.

L> ICO 2&L- ZuG *CO it>\} 6LJD rCtj- &&D 93O lCOlJLaiJCaiCOl3C'L!i

Lake Powelt August 19BB

Figure 28. A January 1998 echogram showing fish concentrated at depths >50 m in the Escalante 

River Arm of Lake Powell.

Canyon Waff Echo

JC CO

Fish Densities - Density values calculated through the first analysis run (echo integration with an 

applied 6.0e-005 sigma) provided a "rough" estimate and was based on the assumption that the 

average fish size was 22.4 cm. To provide a more accurate numerical fish estimates, we had a 

subroutine written to echo-count using a simple rectangular geometric space to fish relationship (Dave 

Marino personal communique). The volume of water being sampled with each ping (6° beam) is 

simply the volume of a cone. The volume of a given strata is a conical section. Total volume sampled 

for each transect is found by multiplying the number of pings by the strata volume.

44
Figure 29. Seasonal distribution of pelagic fish biomass in Lake Mead, Arizona-Nevada from

November 1995 through August 1996.

 ^ ^ ^ TS
Figure 30. Seasonal distribution of pelagic fish biomass in Lake Powell, Utah from November 1995 

through August 1996.

<- "

Fish Biomass

kg/ha >200 100-199 75-99 50-74 25-49 10-24 <10

46
Figure 31. Seasonal distribution of pelagic fish biomass in Lake Mead, Arizona-Nevada from May 

1997 through January 1998.
Figure 32. Seasonal distribution of pelagic fish biomass in Lake Powell, Utah from May 1997 

through January 1998.

Fish Biomass 

kg/ha )-199 75-99 50-74 25-49 10-24 <10

48
Numbers offish found in specific strata (VERTICAL INTEGRATION RESULTS) is divided by the 

sample volume to calculate flsh/m3 . Strata values (fish/m3 ) are summed to compute surface densities 

(fish/m2 or fish/ha). A summary of fish density data is provided in Table 8. More in depth 

information including statistics can be found in Appendix H.

Table 8. Fish densities (fish/ha) measured in the pelagic zone (>20 m water column) of Lake Powell 

and Lake Mead from November 1995 through January 1998 using echo counting techniques.

cjfp 199S _ / _______ 1996 ____ - i 1007 /loofi k71lV A .^ .x %-J / A ^ W

Nov Jan-Feb May Aug May Aug

/ -I S S \J

Oct-Nov Jan

Lake Powell

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

Pll

P12

P13

P14

1.2

0.9

14.0

72.8

56.3

573.8

~

99.2

152.6

338.6

651.2

1,286.8

1,162.2

31.8

8.5

4,946.7

6.3

263.0

30.8

~

65.6

72.2

391.9

64.8

238.8

1,758.6

363.3

19.4

1,127.6

94.0

143.5

45.8

8.5

22.4

65.1

4.7

84.3

14.8

172.2

537.7

3,000.9

3,128.1

29,655.9

22,833.3

9,202.9

5,005.3

10,676.7

50,093.2

2,787.9

57,158.7

659.9

3,018.5

44,746.7

124,667.9

8.1

0.6

15.6

2.5

2.7

10.1

10.7

256.8

11.5

7.6

0.0

160.4

314.1

59.2

40.4

5.4

80.1

3.4

57.3

42.5

32.6

19,997.3

12.8

25.4

173.5

101.8

7,958.0

40,001.6

0.7

5.4

94.5

4.5

11.2

6.4

6,549.1

477.5

9.8

18.8

171.1

241.9

2,275.7

1,885.3

13.4

5.9

76.2

5.2

10.2

18.5

98.7

205.6

163.1

60.5

22.17

37.0

162.9

74.2

Lake Mead

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

Mil

6.2

123.8

4.0

26.2

2.5

3.2

10.2

41.0

553.8

6.2

83.3

366.3

623.2

0.0

242.6

2.0

0.1

16.0

194.0

819.1

62.5

193.6

27.1

577.4

28.1

15.3

10.1

32.3

58.2

19.6

922.9

25.1

889.8

596.1

8,355.9

794.1

1,093.6

537.9

1,755.5

474.2

2,218.2

8,818.5

501.9

1,185.6

2.5

159.2

0.4

0.1

0.5

1.8

107.9

9.4

1,362.8

9.6

93.7

0.5

15,131.4

45.5

380.1

185.9

62.9

257.2

2,024.0

1,863.3

136.6

147.6

0.6

25.6

3.5

3.9

1.5

3.7

41.9

1,184.2

253.1

2.5

660.1

1.9

81.3

14.1

1.4

0.8

3.9

21.3

127.1

151.8

14.3

49
Fish densities (and biomass) for both reservoirs declined from August 1996 to August 1997. 

Average reservoir fish densities dropped from 26,188 to 2,605 fish/ha for Lake Powell and 2,394 to 

1,840 fish/ha for Lake Mead. Pelagic population estimates dropped from 276 million to 90 million 

in Lake Powell. Lake Mead experienced similar, but less severe decline from 108 million to 66 

million fish. The vast majority (99%) of these fish were small (<16 cm) and suspected to be threadfm 

shad.

Table 9. Fish densities (fish/ha) and reservoir population estimates measured in the pelagic zone 

(>20 m water column) of Lake Powell and Lake Mead in August of 1996 and 1997 using echo 

counting procedures*.

Site' ___________

Average 

(fish/ha

August 1!

j SD

')

[)Q/: AnTiift too*?

Total Est. Average SD Total Est. 

(CL=90%) (fish/ha) (CL=90%)

Lake Powell

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

Pll

P12

P13

P14

3,001

3,128

29,656

22,833

9,203

5,005

10,677

50,093

2,788

57,092

660

3,019

44,747

144,668

26,188

292

1,605

3,902

2,126

3,428

1,181

1,564

11,260

687

17,683

78

1,143

6,813

28,684

average

659,478+108,458

9,486,405+8,206,159

212,805,859+47,200,588

377,218,091+59,228,011

55,399,033+34,785,131

9,538,236+3,794,282

24,190,481 +5,974,885

104,589,530+39,635,775

4,414,947 +4,862,043

300,907,351+157,962,239

4,059,225 +797,895

13,354,174+8,525,468

194,811,023+50,003,602

360,195,570+32,125,662

276,154,720+311,044,180

40

5

80

3

57

43

33

19,997

13

25

174

102

7,958

40,002

2,605

56

3

52

3

47

61

32

16,892

17

NA

58

102

2,738

13,798

average

8,883+54,918

16,134 + 43,458

574,786 + 632,982

55,344 + 92,350

344,088 +473,873

81,009+195,977

73,840+122,961

41,752,342 + 59,458,193

20,255 +122,590

133,611 +NA

1,067,427+597,314

450,504 +757,447

34,646,441 +20,096,533

115,574,078+67,209,616

90,782,071 +149,858,212

Lake Mead

MOl 596 93 72,375 ±50,742 <1 <1 

M02 8,356 6,412 24,422,211 ±31,595,462 15,131 7,426 

M03 794 301 8,202,179 ±5,235,231 46 31 

M04 1,093 1,036 1,301,565 ±2,078,850 380 305 

M05 538 629 8,618,377 ±16,973,838 186 87 

M06 1,755 1,186 9,063,979 ±10,324,978 63 51 

M07 474 187 306,273 ±203,413 257 394 

M08 2,218 611 8,957,435 ±11,013,191 2,024 728 

M09 8,818 4,664 30,520,863 ±27,213,705 1,863 1,679 

M10 502 242 1,497,483 ±1,216,532 137 125 

Mil 1,186 245 15,177,295 ±5,292,000 148 32 

	2,394 average 108,140,035 ±111,197,942 1,840 average

55 +345

44,225,090+36,590,571

470,390+533,501

452,403 +612,332

2,978,589 +2,356,307

324,866+445,168

166,100 ±428,787

8,173,074+4,953,941

6,448,916+9,794,353

407,569 ±630,373 

1,889,241 +687,055 

65,536,293 +57,032,733

-60 dB analysis threshold

50
Table 10. Reservoir population estimates of large fish (>16 cm) detected in the pelagic zone of Lake 

Powell and Lake Mead in August of 1996 and 1997 using echo counting procedures.

A 11 <Tii ct IQQ/i _ A.irriic* 1QQ7

Site Fish>16cm Total Fish # Fish>16cm Total Fish# 

(Fish/ha) SD (CL=90%) (Fish/ha) SD (Cl=90%)

Lake Powell

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

Pll

P12

P13

P14

Total

Lake

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

Mil

Total

42.1

56.2

100.1

4.4

5.9

138.4

9.1

11.0

37.1

7.5

15.0

161.3

44.3

28.1

Mead

2.6

15.2

39.2

3.5

8.5

10.2

3.8

4.4

23.9

13.5

4.6

19.7

19.2

3.8

2.4

3.9

118.3

6.6

7.5

54.6

2.8

10.8

129.6

18.7

16.3

1.4

12.5

63.4

4.1

11.6

14.6

2.7

3.3

28.7

19.6

4.9

9,232 ±7,306

170,376+98,391

718,016 ±45,926

72,690 ±6,608

35,516 ±39,732

263,761 ± 379,939

20,550 ±25,376

23,050 ±26,304

58,674 ±145,850

39,220 ± 24,953

92,448 ±112,377

713,560 ±966,223

192,779 ±137,225

81,303 ±79,159

2,491, 176 ±2,095,369

3 12 ±765

44,309 ±61, 669

404,903 ±1,1 04, 170

4,201 ±8,2 11

135,704 ±314,012

52,871 ± 127,010

2,422 ±2,971

17,727 ±59,278

82,718± 167,512

40,396± 98,439

59,143± 106,248

844,706± 2,053,263

0.1

3.1

37.5

2.4

52.0

5.3

13.0

16.2

4.3

17.9

71.3

9.1

422.9

337.3

0.0

125.6

3.0

8.4

0.9

2.8

8.2

56.2

205.1

3.4

14.3

0.1

0.1

52.9

1.7

43.4

7.2

9.5

7.8

6.1

--

59.6

8.5

188.6

228.9

0.0

45.2

3.6

10.3

0.7

2.6

8.4

15.5

179.2

4.8

3.2

13 ±37

9,492+1,637

268,951 +640,081

38,988 ±47,909

3 13,267 ±440,823

10,005+23,051

29,500 +36,478

33,720+27,351

6,826+43,074

94,391 +--

438,313+617,550

40,126+62,821

1,841,1 11 ±869,929

974,396 ±1,1 14,576

4,099,098+3,925,317

0 + 0

287,991 ±222,125

30,574 ±63,007

10,022 ±20,587

14,099 ±17,624

14,508 ±22,201

5,264 + 9,107

226,739 ±105,392

709,747 ±1,045,568

10,084 + 24,162

1 83,445 ± 69,125

1,492,474 ±1,598,898

51
It is interesting to note that the proportion of large to small fish shifted. While the overall pelagic 

standing crop declined (-67%), the number of large fish increased 300% (Figure 33). Lake Mead's 

decline was slightly less at 39%, while the increase of larger fish (+288%) was similar to Lake 

Powell's.

Figure 33. Comparison of the total numbers of pelagic fish, fish larger than 16 cm, and striped bass 

found in Lake Powell and Lake Mead during August 1996 and 1997.

All Fish Fish > 16 cm Striped Bass

100

9/96 9/97 

Lake Powell

9/96 

Lake Mead

9/97

Striped Bass and Carp Population Estimates - Large fish (non-shad >16 cm) population estimates 

were developed for the August 1996 and 1997 surveys using echo-counting techniques and species 

composition information derived from vertical gill netting. Summary of the density output for fish 

>16 cm (-40 dB) is provided in Appendix J. Striped bass represented 74.3% and 89.4% of the larger 

fish netted in Lake Powell and Lake Mead while carp represented 19.7% and 6.7% respectively. In 

August 1996, it's estimated the striped bass community in Lake Powell numbered 1,850,943 

(+1,556,859) while Lake Mead supported 755,167 (+1,835,886). Large fish numbers increased by 

nearly 70% in 1977. Pelagic striped bass numbered 3,045,630 (+2,916,510) in Lake Powell and 

1,334,272 (+1,429,415) in Lake Mead (Table 11). Carp made up a higher percentage of the pelagic 

fishery in Lake Powell (19.7 versus 6.7%) compared to Lake Mead. Carp numbers ranged from over 

807,000 in Lake Powell to a high of 137,000 for Lake Mead.

52
Table 1 1 . Reservoir population estimates for the pelagic striped bass, carp, and walleye in Lake 

Mead and Lake Powell from November 1995 through January 1998.

Species

Lake Powell

Striped Bass

Carp

Walleye

Lake Mead

Striped Bass

Carp

%*

74.3

19.7

3.8

89.4

6.7

August 1996

1,850,943 ±1,556,859'

490,762 + 412,788

94,665 ± 79,624

755,167 ±1,835,885

56,595 + 137,569

Aueust 1997

3,045,630 ±2,916,510

807,522 ± 773,287

155,766 ±149,162

1,334,272 ±1,429,415

99,996 ± 79,624

*Based on combined gill net capture data (November 1995 - January 1998) 

1 Confidence limits = 90%

53
DISCUSSION

Technical advances in the past decade in computer technology, digital processing, and miniaturizingelectronics has substantially advanced fishery acoustics. While systems have become more 

economical and data acquisition easier, sampling design, data interpretation and presentation continue 

to challenge investigators. Analysis demands a skill in electronics, physics, and computer 

technology, but just as important is an understanding of specific aquatic communities. The marriage 

of these sciences is essential for accurate and meaningful data interpretation.

A critical challenge is the categorizing or separating of macro plankton from small fish. 

Echosounders can detect "targets" smaller than 500 //m (-90 dB), however they can not identify 

targets. Data interpretation balances on the investigators' familiarity with the composition and size 

of small fish and macro-zooplankton.

The problem of misinterpreting macro-zooplankton as small fish has occurred on Lake Mead (Mueller 

1993) and Lake Havasu (BioSonics 1986) where there was either no distinction made between these 

organisms or large zooplankton may have been misinterpreted as small fish. There are several large 

zooplanktors, such as Chaborous fBoxrucker 1996), Mysis, and Leptodora kindti that can grow larger 

(18 mm) than most meta-larval fish (Snyder 1981). While the baseline acoustical data for these 

studies remain valid, data interpretation may be flawed.

A review of the plankton community (which included Leptodora} and estimated target strength 

correlations, convinced us that a -60 dB analysis threshold (2 cm) was necessary to separate 

Leptodora from juvenile fishes. However, following data collection we discovered published 

evidence that suggests the standard target strength regressions used by our analysis software and the 

acoustic community for over 2 decades might be in error (MacLennan and Simmonds 1992, Fleischer 

et al. 1997). Our data support the contention that actual thresholds for small fish may have been over 

estimated. For instance, the acquisition threshold for 2-cm targets would probably be closer to a -65 

dB threshold (MacLennan and Simmonds 1992) than the -60 dB derived by Love's equation (Love 

1977).

Comparison of target strength distribution of the -60, -65, -90 dB data sets for August 1997 suggests 

that the -60 dB threshold may have under estimated fish densities by 50%. It appears substantial 

numbers of small fry were not being detected at a -60 dB threshold. This was not a problem for other 

survey periods when fish had grown larger than three centimeters.

The Pelagic Community

Data illustrated pelagic fish communities were highly mobile, moving vertically, laterally, and 

longitudinally on a diel and seasonal bases. These movements, especially seasonal migrations 

between shallow and deeper habitats, can greatly influence population estimates. August surveys 

provided the highest estimates reflecting annual production. These measurements should be 

considered conservative, since young fish located within a meter of the surface cannot be detected.

54
Young fish survival is typically low as larvae and fry compete for food and attempt to avoid 

predators. Fall and spring surveys were influenced by fish moving between the pelagic and littoral 

zones to spawn and feed and during the winter, fish migrate into deeper seasonal habitats making 

them more detectible to acoustics. Winter surveys would be the most appropriate time to estimate 

carrying capacity and brood stock levels of threadfin shad and striped bass.

Pelagic fish communities of both reservoirs were highly variable. Downstream and central portions 

of both reservoirs can be described as being highly oligotrophic. Primary production (chlorophyll-^) 

in the central portions of the reservoirs is typically <2 wg/L (Paulson and Baker 1983) which is 

normally considered inadequate to sustain any appreciable levels of plankton or planktivorous fish 

(<10 kg/ha). These extremely low fish densities are contrasted by high primary production found 

in the inflow areas. These sites support three distinct pelagic fisheries in both reservoirs.

On Lake Powell, pelagic fish production was greatest at Warm Creek and the Colorado and San Juan 

Rivers where primary production is supported by nutrient loading (phosphorus). Lake Mead's pelagic 

fishery is supported by high productivity found in Las Vegas Wash and by inflows from the Colorado 

and Virgin Rivers. It's believed these communities expand and contract with changes in nutrient 

inputs, primary production, and spawning success. Actual recruitment appears dependent upon a 

multitude of other physical and biological factors such as food availability, habitat quality and 

quantity, and predator prey relationships.

Boom and Bust Fishery

When conditions are favorable, as they were in 1995 and 1996, pelagic communities can rapidly 

expand laterally, from nursery habitats down reservoir. Fish densities increased 3 to 4 orders of 

magnitude reflecting the fecundity of both threadfin shad and striped bass. Depended upon the size 

of the female, threadfin shad are capable of producing 800 to 21,000 eggs and are able to spawn their 

first year (Johnson 1971). A mature striped bass can annually produce 11,000 to 1-2 million eggs 

(Minckley 1973, Moyle 1976). This reproductive ability, coupled with favorable habitat conditions 

and food availability, permits both species to rapidly expand their populations.

Striped bass were introduced to take advantage of abundant shad populations. They have. 

Unfortunately their reproduction and growth potential can devastate shad and other potential prey 

species, literally overwhelming their food supply. This boom and bust phenomena is most 

pronounced in reservoirs that have simple prey bases like Lakes Powell and Mead (Axon and 

Whitehurstl985).

Our data suggest total fish biomass for both reservoirs declined between August 1996 and 1997. This 

correlates nicely with larval shad trawl data collected by UDOWR (unpublished data -George 

Blommer) and similar trawling data for Lake Mead (Jim Hendricks) while large (>16 cm) fish 

numbers actually increased by nearly 300%. While we have only 2.5 years of data, we believe this 

shift in predator/prey composition illustrates the intersect of an increasing predator community at the 

expense of its prey base. The abundance of shad in 1996 apparently carried over into 1997 to support

55
a thriving striped bass community. However, when we finished our field surveys in January 1998, 

we observed emaciated and dead striped bass in Lake Powell and reports of poor conditioned bass 

in Lake Mead. This supports earlier speculations that a shrinking forage base leads to a rapid decline 

in the striped bass fishery (John Hutchings -NDOW, Wayne Gustaveson-UDOWR personal 

communique).

Area biologists have studied the cyclic and dynamic nature of these fisheries. Persons and Dreyer 

(1987) showed a decline in condition factor and striped bass size before and after 1980. Some of 

these declines were attributed to reductions in nutrient loading associated with the closure of Glen 

Canyon Dam (NDOW 1980). There have been studies examining the merits of augmenting this loss 

with artificial fertilization (Paulson and baker 1984). The hypothesis being that increased 

productivity would be a stabilizing force. Unfortunately, investigators found nutrient uptake was 

rapid, with little or no measurable long-term benefits.

Our data suggests there were roughly twice as many fish in the pelagic zone of Lake Powell as 

compared to Lake Mead. Lake Powell may be more productive, however, it appears more vulnerable 

(rate and frequency) to the dramatic shifts in standing crop, species composition, and predator/prey 

ratios. Reduced nutrient inflows from the Colorado River and fairly consistent nutrient inputs from 

Las Vegas Wash may provide some degree of stability to the Lake Mead pelagic fishery.

Fish Movements

Pelagic fish densities and distribution are also influenced by the more subtle changes of season. 

Numerically, fish peaked following spawning and gradually declined, due to natural mortality, 

predation, and harvest until the next spawning cycle. Distribution within the reservoir remained high 

at, or near the three inflow nursery areas. During the summer, fish are typically found near the 

surface taking advantage of warmer temperatures and abundant food. Larger fish were typically 

found near or below the thermocline, inhabiting deeper cooler habitats. It's suspected the majority 

of the large fish were striped bass and carp, and in the case of Lake Powell, some walleye. In the fall, 

as reservoir temperatures cool, fish migrated from shallow to deeper habitats where they concentrate 

at depths greater than 40 m. Fish in Lake Powell typically moved to the side canyons during the 

winter where they were found in narrowly defined depths ranging between 40 to 80 m. These 

seasonal movements were quite evident in Bull Frog Basin, Piute Basin, and the Escalante River Arm. 

Seasonal distribution shifts were similar on Lake Mead where fish moved down reservoir from 

inflow areas to deeper portions of Gregg's Basin, Overton Arm, and Las Vegas Bay.

We also observed diel movements of shad and striped bass. Fish were typically found schooling at 

greater depths during daytime hours. In winter they were often detected on, or just above the bottom 

(depths <50 m). During the summer, fish formed schools near or just above the thermocline. 

Schooling fish became more active at dusk, dispersing toward the surface (Luecke and Wurtsbaugh 

1993). Boisclair (1998) reported that horizontal migrations of shoreline fishes into pelagic zones can 

also occur at night. These movements are undoubtedly complex and influenced by factors such as

56
food availability, thermal stratification, thermal preferences, light intensity, feeding behavior, and 

predator-prey interactions.

RECOMMENDATIONS

Hydroacoustics proved to be an effective technique to quantify the pelagic fishery of both reservoirs. 

Its application has both long-term and immediate management implications. On a long-term basis, 

the development of reservoir standing crop data would help monitor changes in reservoir carrying 

capacity. Without this type of data resolution, it would be virtually impossible to measure, let alone 

detect, changes in reservoir productivity resulting from subtle differences in climate change, reservoir 

operation, water quality, or habitat conditions.

This technology also provides resource managers cost effective and rapid information at a resolution 

not previously available. Based on our experience, a complete reservoir survey similar to our study 

design and data analysis could be completed by a team of two biologists in less than two weeks. The 

resulting data would provide managers extensive and timely plankton and fishery information that 

could be used in management decisions. Data would provide information on densities, population 

estimates, size distribution, and location and allow managers the option of passing this information 

along to anglers to increase harvest.

Another useful application would be its use to measure and monitor habitat degradation due to 

siltation and/or problems associated with water quality. A good example is Las Vegas Bay. Here 

organic loading has resulted in high rates of oxygen demand. During summer stratification, 

hypolimnetic habitats that are normally used by striped bass are totally anoxic. Fish either cannot 

survive or avoid in these low oxygen environments. Our system can three dimensionally map the 

bathometry and "fish free" zones. In essence, the absence or presence of fish would help describe 

dissolved oxygen conditions without the need to conduct extensive and timely water sampling. The 

bay could be easily mapped in a day which would provide information on current conditions and 

additional surveys would provide information on the expansion or contraction of these zones.

The ultimate monitoring goal would be to survey both the pelagic and littoral zones to estimate total 

reservoir biomass. Our transect data does include near shore (<20 m depths) data, however, we feel 

it's far too limited to accurately describe littoral communities. A more extensive survey design may 

be needed to address differences in species composition, species specific use of coves and structure, 

potential diel movements of shore oriented fishes into the pelagic zone to feed, and seasonality issues.

Acoustics could also be used to determine fish vulnerability to entrainment. Reclamation is currently 

examining possible fish entrainment at both Glen Canyon and Hoover Dams. Acoustics would 

provide density data at specific depths, providing operators information concerning densities offish 

that might be vulnerable to entrainment or passage. For instance, Glen Canyon Dam is currently 

examining the release of surface waters to warm downstream releases. Based on the limited data we 

collected near Glen Canyon Dam in August 1996, fish densities suggest that surface withdrawals 

(10,000 cfs) could result in the passage of nearly 250,000 fish/week.

57
We recommend that future data be collected at a maximum low threshold of -70 dB. We also suggest 

that reservoir wide surveys be conducted at least once a year, preferably in late winter before fish 

move out of the deeper habitats to spawn. We feel transect data variability could be improved. 

Future monitoring should pay closer attention to bathometry to improve transect similarity.

ACKNOWLEDGMENTS

The study would not have been possible without the cooperation, assistance, and generosity from 

Wayne Gustaveson, George Blommer (UDOWR), Tom Liles (AGFD), John Hutchings, Jim 

Hendricks (NDO W), John Ritenour (GCNRA), Kent Turner (LMNRA), Tom Burke (BOR) and their 

respective staffs. Ray Bark assisted in data analysis, Blair Hanna helped develop the echocounting 

program, and numerous people aided in data collection. We give a special thanks to Dan Wiggens 

and Dave Marino (BioSonics) who answered countless questions regarding the analysis program and 

to the staff of the Lower Colorado Regional Office (BOR) for providing office and storage facilities 

and logistical support. Work was conducted under permits issued by NFS, NDOW, AGFD, and 

UDOWR. The study was funded jointly by USGS and Reclamation.

LITERATURE CITED

Allan, R.C., and D.L. Roden. 1978. Fish of Lake Mead and Lake Mohave. Biological Bulletin No. 

7. Nevada Department of Wildlife, Reno, NV. 105 pp.

BioSonics, Inc. 1986. Hydroacoustic studies at Lake Havasu, August 1986. BioSonics, Inc. 4520 

Union Bay Pl.NE, Seattle, WA 98105. 60 pp.

BioSonics, Inc. 1987. Mobile hydroacoustic fishery study in the Virgin Canyon area of Lake Mead, 

NV, BioSonics, Inc. 4520 Union Bay Pl.NE, Seattle, WA 98105. 27 pp. + appendix

BioSonics, Inc. 1998. Guide to using DT-Series hard and software. BioSonics, Inc. Manual V.2.1 

(1998), Seattle, WA.

Blommer, G.L., and A.W. Gustaveson. 1997. Smallmouth Bass in Lake Powell, 1982-1996. 

Publication No. 97-9. Utah Division of Wildlife Resources, Salt Lake City, UT.

Boisclair, S.C. 1998. Day-to-day variation in fish horizontal migration and its potential consequence 

on estimates of trophic interactions in lakes. Fisheries Research 35:75-81.

Boxrucker, J. 1996. Sampling shad in Southern impoundments. Oklahoma Department of Wildlife 

Conservation, Norman, OK. 22 pp.

58
Coutant, C.C. 1985. Striped bass, temperature, and dissolved oxygen: a speculative hypothesis for 

environmental risks. Transactions of the American Fisheries Society 114:31-61.

Fleischer, G.W., R.L. Argyle, and G.L. Curtis. 1997. In situ relations of target strength to fish size 

for Great Lake pelagic planktivores. Transactions of the American Fisheries Society 126:786-794.

Greenlaw, C.F. 1979. Acoustical estimation of zooplankton populations. Limnology and 

Oceanography 24(2):226-242

Gustaveson, A. W. 1999. Cyclical population dynamics of self-sustaining striped bass in Lake Powell, 

Utah-Arizona 1974-1998. Utah Department of Natural Resources. Publication No. 99-09. Salt Lake 

City, UT

Johnson, J. E. 1971. Maturity and fecundity of threadfm shad, Dorosoma petenense (Gunther), in 

Central Arizona reservoirs. Transactions of the American Fisheries Society 99(4): 73 9-753.

Kelley, J.C. 1976. Sampling the sea, p. 362-387. In D.H. cushing and J.J. Walsh eds. The ecology of 

the seas. Saunders

LaBounty, J. F., and M. J. Horn. 1997. Influence of drainage from the Las Vegas Valley on the 

limnology of Boulder Basin, Lake Mead, Arizona-Nevada. Lake and Reservoir Management 

13(2):95-108.

Listen, R.L. and S.J. Grabowski. 1988. Characterization of the aquatic environment in Lake Mead 

near the proposed Spring Canyon Pumped-Storage Project, and assessment of potential aquatic 

impacts. Bureau of Reclamation, Applied Sciences Branch, Denver, CO 80225. 225 pp.

Love, R. 1977. Target strength of an individual fish at any aspect. Journal of the Acoustical Society 

of America. 62(6): 1397-1403.

McNaught, D.C. 1968. Acoustical determination of zooplankton distributions. Proceedings of the 11 th 

Conference, Great Lakes Research: 76-84

McNaught, D.C. 1969. Developments in acoustic plankton sampling. Proceedings of the 12th 

Conference, Great Lakes Research: 61-68

Luecke, C., and W.A. Wurtsbaugh. 1993. Effects of moon light and daylight on hydroacoustic 

estimates of pelagic fish abundance. Transactions of the American Fisheries Society. 122:112-120.

MacLennan, D.N., and E.J. Simmonds. 1992. Fisheries acoustics. Chapman & Hall, London, 325 

pp.

59
May, B.E., C. Thompson and S.P. Gloss. 1975. Impact of threadfm shad (Dorosomapetenense) 

introduction on food habits of four centrachids. Publication No. 75-4, Utah Division of Wildlife 

Resources, Salt Lake City, UT.

Minckley, W.L. 1973. Fishes of Arizona. Arizona Game and Fish Department, Phoenix, AZ. 293 

pp.

Minckley, W.L. 1979. Aquatic habitats and fishes of the Lower Colorado River, Southwestern 

United States. Submitted to the Bureau of Reclamation, Contract # 14-06-300-2529, Boulder City,

NV

Morton, K.F. and S.G. MacLellan. 1992. Acoustics and freshwater plankton. Journal of Plankton 

Research 14:1117-1127

Moyle, P.B. 1976. Inland fishes of California. University of California Press, Berkeley, CA 405 pp 

Mueller, G. 1993. Monitoring impacts on inland fisheries using hydroacoustics. Bureau of 

Reclamation, Global Climate Change Response Program, Denver, CO. 37 pp

Nevada Department of Wildlife. 1980. Job progress report for Lake Mead. Prog. No. F-20-17. 209 

pp.

Paulson, L. J., and J.R. Baker. 1984. The limnology in reservoirs on the Colorado River. Submitted 

to the Bureau of Reclamation, Contract # 14-34-0001-1243, Boulder City, NV

Persons, W.R., and R. Dreyer. 1987a. Relationship between striped bass (Morone saxatilis) and 

threadfm shad (Dorosomapetenense) in Lake Mead. Dingell-Johnson Project F-14-R-20, Arizona 

Game and Fish Department, Phoenix, AZ. 39 pp.

Persons, W.R., and R. Dreyer. 1987b. Annotated Bibliography on the Use of Hydroacoustics as a 

Fish Stock Assessment Tool. Dingell-Johnson Project F-14-R-20, Arizona Game and Fish 

Department, Phoenix, AZ. 17 pp.

Scott, S.J., and A.W. Gustaveson. 1986. A creel census summary of twenty-two years at Lake 

Powell, Utah, 1964-1985. Dingell-Johnson Project F-46-R-1. Publ. No. 89-10. Utah Division of 

Wildlife Resources, Salt Lake City, UT. 32 pp.

U.S. Bureau of Reclamation. 1999. Glen Canyon Dam Modifications to Control Downstream 

Temperatures, Plan and Draft Environmental Assessment, January 1999. Upper Colorado Regional 

Office, Salt Lake City, UT

60
Vollenweider, R.A. 1970. Scientific fundamentals of lakes and flowing waters, with particular 

reference to nitrogen and phosphorus as factors in eutrophication. Rep.DAS/CSL/6827, Org. Econ. 

Coop, and Dev., Paris. 192 pp.

61
ANALYSIS SETTINGS AND FORMAT

The following is a description of the methods and settings we used to analyze the data presented in 

this report.

Enter Visual Analyzer- hit File, hit Open Data File..

Select appropriate drive, and file name (*.dt4)-OK 

Display Position Run entire file 

Time-Varied-Gain 40 

Transducer Default 

Setting for Display and Analysis Threshold -65 or -60

'(analysis threshold must be =< aquisition threshold) 

Absorption Coefficient Default 

Salinity 0.0

Temperature 10, 15. 20 dependent upon season 

Calibration offset -30 dB for biomass* _0. for echocounting

* the -30dB was used to amplify targets located deeper than 10m which would otherwise

have been lost. The amplification must be taken out during the analysis phase by 

subtracting the default sigma (6.0e-005) by -30dB or -003, setting sigma to 6.0e-002.

OK Echogram program starts running

Configure hit Bottom Tracking hit Advanced Setting activate Contiguous OK OK 

Configure hit Echo Recognition set Target Threshold -65 or -60 dB--OK 

Configure hit EI/TS Analysis Setting hit Reports and Strataset Minimum Distance to 1 or 2m

(1m is the default appropriate for calm conditions, 2 m for waves or stormy conditions) 

Maximum Distance This is specific to file or season. Select bottom depth or area below the 

majority offish, (Normally 20-30 in summer, to 50-70 in winter) 

Number of Strata normally 3-5 for biomass (10m depth increments) or 20 for

echocounting (1m depth increments)

Number Reports J_ -OK- El Scaling/TS/Threshold Sigma 6.e-QQ5 (biomass) or set Output a_ 

use for El (to conduct target strength analysis and echo counting) set Selected Resolution and 

enter First and Last Ping number (ping number when depths >20 m and ping number when depths 

<20 m)~QK~

" icons " hit show bottom hit edit bottom hit Redraw ec/r 0grfl/w(completed)--manually edit bottom 

(using the cuser to move editing chain)~hit save edit 

hit Analyze hit preform analysis Analyzer "Preform analysis on viewed area only! hit-No

Analysis begins. ends hit Report select a Name filef*.csvV- hit OK--

hit "icon"- review results (to examine data summary) Once the summary file is closed it can only

be opened to review from outside the analysis program (i.e notebook, windows, 

spreadsheet programs). Back out to start over.

62
DESCRIPTION OF THE DT ANALYSIS REPORT FORMAT

(Echo integration)

DT ANALYSIS REPORT,

DATAFILE INFORMATION,

Analysis Version:, Visual Analyzer Version 2.1.1,

File Name:, E:\P02A.DT4, 

Data Threshold:, -70.00, dB, 

Threshold Type:, squared, Information pertaining to equipment and conditions

Ping Rate:, 2.00, pps, 

Collection Range:, 0.98, to, 142.63, m,

Pulse Width:, 0.40, ms, 

Absorption Coefficient:, 0.036372, dB/m,

Salinity:, 0.00, ppt, 

Water Temperature:, 20.00, deg C, 

Sound Velocity:, 1522.16, m/s,

TRANSDUCER INFORMATION,

Serial Number:, 49526,

Beam Width:, 6.00, deg, Equipment specification 

Transmit Frequency:, 420000, Hz, 

Transmit Source Level:, 219.00, dB//uPa,

Receive Sensitivity:, -52.00, dBC/uPa,

Calibration Correction Narrow Beam:, -30.000, dB, A calibration setting used to amplify targets 

Beam Pattern Factor:, 0.000991,

ANALYSIS PARAMETERS,

Analyzed As: Single-Beam

Ping Range:, 10, to, 1950,

Sample Range:, 12.0, to, 42.0, m, Depth of analysis 

Data Threshold:, -60.00, dB,

Number Strata:, 3, Number of depth increments 

Number Reports:, 1, 

Density Scaling Constant:, 1.052194e-014,

BOTTOM TRACKER PARAMETERS AND RESULTS,

Bottom Threshold:, -3.00, dB,

Bottom Width:, 0.09, m, 

Blanking Threshold:, -60.00, dB, 

Blanking Zone:, 0.23, m,

63
Blanking Type:, CUMULATIVE

Alarm limit:, 05, pings, 

Tracking Window:, 1.79, m,

Number processed:, 1941, pings, Number of samples or pings examined

Number found:, 1941, pings, 

Find rate:, 100.00%,

VERTICAL INTEGRATION RESULTS,

~5

STRATA, TOP , BOTTOM, Sv (dB) , Applied Sigma, FPCM,

1. 12.0, 22.0, -4.299652e+001, 6.000000e-002, 8.359816e-004, Fish Per Cubic Meter

2. 22.0, 32.0,-4.539699e+001, 6.000000e-002, 4.810048e-004,

3. 32.0, 42.0, -5.58541 le+001, 6.000000e-002, 4.329502e-005,

HORIZONTAL INTEGRATION RESULTS,

____ ___ _ ___. ____. __ _ ^

REPORT, TIME AND DATE, Depth, Latitude, Longitude, Sv (dB) , Applied Sigma, FPUA,

1, 08/08/9623:35:59,136.9, 0° 0.000'N, 0° 0.000'E,-4.565341e+001, 6.000000e-002, 1.360257e-002, 

Fish per unit (m2) area ( x 10,000 = fish/ha2)

VOLUME BACKSCATTERING STRENGTH (dB),

__. _ . __ _ _ ^

REPORT 1,

STRATA 1, -4.300e+001,

STRATA 2, -4.540e+001,

STRATA 3, -5.585e+001,

ABSOLUTE DENSITY DISTRIBUTION MATRIX (IN NUMBER PER CUBIC METER), 

REPORT 1,

STRATA 1, 8.360e-004, Fish Per Cubic Meter

STRATA 2, 4.810e-004,

STRATA 3, 4.330e-005,

PERCENT INTEGRATED MATRIX, 

REPORT 1,

STRATA 1, 100.000, % of strata that was water versus bottom

STRATA 2, 100.000,

STRATA 3, 99.404,

64
APPENDIX A

STUDY SITE COORDINATES

and 

TRANSECT PROFILES

65
GPS Coordinates for Lakes Powell and Mead-Pelagic Fish Study.

Lake Powell

Site

P01

P02

P02

P02

P02

P03

P03

P03

P03

P03

P03

P04

P04

P04

P04

P05

P05

P05

P05

P05

P06

P06

P06

P06

P06

P07

P07

P07

P07

P07

P07

P08

P08

P08

P08

P09

P09

P10

P10

P10

P10

P10

P10

P11

P11

P11

P11

P11

P11

P12

P12

P12

P12

P13

P13

P13

P13

P14

P14

P14

P14

P14

P14

Trans.*

N

AS

BS

CN

CS

AN

BN

CN

S

WCN

WCS

AN

BN

CN

S

AS

BS

CN

CS

N

AN

AS

BN

BS

CN

AN

AS

BN

BS

CN

CS

AN

BN

CN

S

N

S

AN

AS

BN

BS

CN

CS

AN

AS

BN

BS

CN

CS

AN

AS

BS

CN

AS

BS

CS

N

AN

AS

BN

BS

CN

CS

Lat.

N36'57'17.10"

N36'57'24.63"

N36'57'21.95"

N36'59'12.93"

N36'58'17.76"

N37'03'37.78"

N37'03143.12"

N37'03'56.64"

N37'03'16.84"

N37'05'06.47"

N37'04'37.18"

N37'03'11.22"

N37'04'18.97"

N37'05'16.91"

N37'03'01.65"

N37'07'06.71"

N37'07'19.40"

N37'08'00.80

N37'07'39.99"

N37'08'00.80"

N37'11 '27.90"

N37'10'39.30"

N37'10'39.30"

N37'10'03.90"

N37'10'46.17"

N37"12'00.00"

N37'11 '56.65"

N37'12'05.90"

N37'12'05.84"

N37'12'11.80"

N37'12'12.20"

N37'14'5.31"

N37'14'33.88"

N37'14'22.99"

N37'14'09.37"

N37'19'26.09"

N37'18'41.76"

N37'19'33.32"

N37'18'41.72"

N37'19'33.92

N37'18'42.59"

N37'19'35.03"

N37'18'45.31"

N37'31'53.70"

N37'31 '27.56"

N37'32'11.88"

N37'31 '45.03"

N37'32'17.17"

N37'32'05.54"

N37'36'27.09"

N37'35'29.77"

N37'36'21.64"

N37'36'54.90"

N37'38'37.65"

N37'38'50.81"

N37'39'01.52"

N37'39'38.80"

N37'49'08.37"

N37'48'21 .03"

N37'49'08.35"

N37'48'23.87"

N37'49'08.06"

N37'48'27.98"

Long.

W111'29'23.69"

W111'25'05.59"

W111'23'46.93"

W111'23'52.59"

W111'23'31.30"

W111'26'09.72"

W111'26'10.03"

W111'26'17.52"

W111'26'54.56"

W111'27'45.06"

W111'27'22.55"

W111'19'46.29"

W111'18'51.78"

W111'18'13.08"

W111'17'02.07"

W110.56'22.90"

W110'56'22.50"

W110'57'15.20"

WHO'56'27.40"

W110'57'17.80"

W110'51 '36.20"

W110'52'37.21"

W110'52'37.21"

W110'51'56.10"

WHO'52'05'99"

W110'40'10.80"

W110'39'06.50"

W110'40'13.10"

WHO'39'05.99"

W110'40'12.80"

W110'39'06.60"

W110'38'03.10"

W110'37'50.59"

W110'37'31.88"

W110'37'56.89"

W110'55'00.19"

WHO'53'49.20"

WHO'47'45.25"

W110'47'55.98"

WHO'47'35.80"

W110'47'38.49"

W110'47'27.45"

W110'47'29.91"

W110'44'50.58"

W110'45'53.39"

W110'45'10.84"

W110'46'08.59"

W110'45'30.12"

WHO'46'24.83"

W110'36'00.70"

W110'35'48.07"

WHO'35'00.45"

W110.34'11.34"

W110'29'59.74"

W110'28'54.68"

W110'28'47.80"

W110'30'05.15"

W110'27'10.97"

W110'27'23.53"

W110'27'00.37"

W110'27'14.31"

W110'26'55.15"

WHO'27'00.60"

Lake Mead

Site

M01

M01

M02

M02

M02

M02

M02

M02

M03

M03

M03

M03

M03

M03

M04

M04

M04

M04

M05

M05

M05

M05

M05

M05

M06

M06

M06

M06

M06

M06

M07

M07

M07

M07

M08

M08

M08

M08

M08

M08

M09

M09

M09

M09

M09

M10

M10

M10

M10

M10

M10

M11

M11

M11

M11

M11

M11

Trans.*

N

S

AN

AS

BN

BS

CN

CS

AN

AS

BN

BS

CN

CS

AS

BS

CN

CS

AN

AS

BN

BS

CN

CS

AN

AS

BN

BS

CN

CS

AS

BS

CN

CS

AN

AS

BN

BS

CN

CS

AN

AS

BN

BS

CS

AN

AS

BN

BS

CN

CS

AN

AS

BN

BS

CN

CS

Lat.

N36'01'37.71"

N36'01 '02.74"

N36'07'35.09"

N36'06'41 .87"

N36'07'33.52"

N36'06'50.98"

N36'07'36.66"

N36'06'50.14"

N36'07'14.17"

N36'04'58.38"

N36'07'28.50"

N36"05'10.51"

N36'07'27.10"

N36'05'19.02"

N36'08'19.98"

N36'08'37.22"

N36'09'08.06"

N36'09'03.88"

N36'09'04.46"

N36'07'03.03"

N36'09'29.97"

N36'07'00.66"

N36'09'29.44"

N36'07'08.83"

N36'04'15.13"

N36'03'51.12"

N36'04'05.04"

N36'03'37.26"

N36'03'52.37"

N36'03'32.16"

N36'00'50.14"

N36'01 "08.54"

N36'01 '44.73"

N36'01 '22.49"

N36'04'55.00"

N36'04'08.73"

N36'05'15.00"

N36'04'27.37"

N36'05'40.32"

N36'04'44.94"

N36'13'01.21"

N36'12'40.70"

N36'13'09.68"

N36'12'50.31"

N36'12'55.65"

N36'14'14.38"

N36'13'43.29"

N36'14'29.47"

N36'13'58.55"

N36'14'41.30"

N36'14'05.99"

N36'25'03.03"

N36'23'30.18"

N36'25'17.79"

N36'23'35.63"

N36'25'25.07"

N36'23'45.89"

Long.

W114'43'29.34"

W114'44'07.20"

W114'49'09.22"

W114'50'19.20"

W1 14.49"! 7.56"

W114'50'19.71"

W114'49'22.92"

W114'50'26.90"

W114'43'42.72"

W114'42'49.77"

W114'43'14.65"

W114'42'20.88"

W114'42'36.29"

W114'41 '48.45"

W114'36'13.31"

W114'35'13.41"

W114'33'03.10"

W114'34'11.67"

W114'26'52.64"

W114'25'27.87"

W114'27'04.13"

W114'25'10.61"

W114'26'18.04"

W114'25'10.34"

W114'17'47.46"

W114'20'18.26"

W114'17'43.57"

W114'20'12.03"

W114'17'40.09"

W114'20'10.07"

W114'13'15.97"

W114'12'20.75"

W114'10'06.50"

W114'11 '03.36"

W114'08'48.06"

W114'06'39.74"

W114'08'38.65"

W114'06'30.52"

W114'08'24.81"

W114'06'27.81"

W113'59'48.87"

W114'00'50.45"

W113'59'56.41"

W114'00'54.85"

W114'00'54.25"

W114'24'53.22"

W114'23'06.32"

W114'24'49.59"

W114'22'56.50"

W114'24'48.13"

W114'22'53.07"

W114'22'20.87"

W114'20'19.88"

W114'22'06.64"

W114'20'18.85"

W114'21 '56.44"

W114'20'04.16"

*A,B,C=transects 

N=north end, S=south end. (i.e. AN=north end of transect A)

66
.ake Powell

Total Map Ar

.ocation

301

302

303

304

D 05

306

307

308

309

P10

P11

P12

3 13

314

DDC

SJR

Total

Actual

Difference

D ercent Gain

Accuracy

Arizona, Ute

53- 161390 i

h

\cres @ 3701

Hectares

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.9

1583.65

5264.42

6150.9

4424.08

4353.64

2889.24

314.12

1341.03

65548.88

65314.53

234.35 +

0.36%

99.64%

)EI.

Acres

543.03

7493.67

17731.3

40821.63

14874.55

4708.8

5598.53

5159.13

3913.14

13008.21

15198.65

10931.75

10757.67

7139.21

776.19

3313.63

161969.09

161390

579.1 +

0.36%

99.64%

67
_ake Maed -

Total Map Ar

.ocation

VI01

VI02

VI03

VI04

VI05

VI06

VI07

\KQB

VI09

VI10

V1 11

Colo.R. Inlet

ceberg Can}

Total

Actual

Difference

3ercent Loss

Accuracy

Arizona, Nev

33 -1 62700 >

on

ada

Kcres@ 12K

Hectares

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.9

4038.1

3461

2983.45

12801.47

1146.11

391.75

61216.14

65844.7

-4628.56

7.03%

92.97%

)EI. ?????

Acres

300

7222

25523

2941

39589

12758

1596

9978

8552

7372

31632

2832

968

151263

162700

-11437

7.03%

92.97%

68
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APPENDIX B

LIMNOLOGICAL DATA

139
Table a. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for 

November 1995.

Station Depth Temperature pH Conductance Dissolved Oxygen 

______(m) (Centigrade)__________(us/cm)______(mg/L)___

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P4

P4

P4

P4

P4

P4

P4

P4

P4

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

0

2

4

6

8

10

15

20

25

30

35

40

45

50

55

60

65

70

0

5

10

15

20

25

30

35

! 40

17.55 ! 8.42

17.33 ! 8.44

17.29 8.44

17.28 8.44

17.28 8.43

17.28 8.43

17.28 8.42

17.24 8.39

16.8 8.26

15.93 8.08

15.02 8.1

14.03 8.11

12.41 \ 8.1

10.24 | 8.04

8.8 18

j 8.06 | 7.94

17.4 i 8.5

: 17.4 i 8.51

17.4 i 8.51

! 17.38 ! 8.51

] 17.38 i 8.51 . » ^ .^

| 17.38 j 8.5

i 17.38 1 8.49

j 17.38 | 8.49

1 17.37 1 8.48

I 17.25 I 8.46

I 16.58 1 8.26

, 1557 | 8.17

i 14.44 i 8.14

I 12.86 | 8.11

i 11.37 ! 8.06

) 10.24 | 8.01

949 i 799

j 17.51 f 8.36

1 17.53 j 8.37

I 17.53 1 8.37

j 17.54 I 8.35

i 17.54 ! 8.35

i 17.56 i 8.35

i 17.02 i 8.03

! 16.49 i 7.99

! 15.86 I 8.04

645

645

645

645

645

650

650

650

680

720

72Q

710

710

750

800

830

640

640

640

640

640

640

640

640

640

640

640

700

700

700

710

710

740

740

550

550

550

550

550

550

560

620

650

7.1

7.2

7.24

7.1

7.2

7.3

7.3

7.1

5.9

4.6

5.5

6.2

6.7

6.6

6.6

6.1

7.53

7.5

7.5

7.5

7.5

7.5

7.55

7.5

7.65

7.65

7.5

5.9

5.7

6

6.7

6.4

6.5

6.5

7

7

! 7

! 7

7

j 7

j 4.4

! 4.7

i 5.15

140
P4 ;

P4

P4

P5

P5

P5

P5 ______

P5

P5

P5

P5

.____

P5

P5

P5

P5

P5

P5

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

45 ! 15.47

50 14.36

55 13.37

0 17.27

5 1 17.27

10 I 17.23

_ . ^22

20 | 17.22

25 I 17.22

30 i 17.2

35 | 16.46

40 i 15.51

45 i 15.02

50 I 14.16

55 | 12.76

60 11.79

65 10.71

70 | 9.77

75 i 9.11

0 I 17.27

2 ; 1723

4 | 1718

6 ; 17.25

8 i 17.26

10 I 17.25

15 I 17.22

20 j 1723

25 S 17.17

30 | 17.11

35 i 16.39

40 I 15.59

45 j 1486

50 ! 13.85

55 i 12.73

60 I 11.63

65 \ 10.91

70 ! 9.93

6 | 17.93

2 i 17.91

4 i 17.79

6 f 17.74

8 ! 17.74

10 ; 17.74

15 17.72

20 i 17.67

25 | 17.72

30 I 16.9

35 I 16.76

40 ! 15.71

I 45 | 1481

8.07

8.13

8.13 !

8.19 i

8.25

8.25

8.25

8.25

8.25

8.24 8

7.92

7.94

7.96

7.98

7.95

7.91

7.92

7.91

8.19

8.2

8.2

8.2

8.19

8.19

8.17

8.16

8.14

8.11

7.89

7.91

7.94

7.96

7.92

7.8

7.73

7.68

8.19

8.2

8.18

8.17

8.16

8.16

8.14

8.13

8.17

7.9

7.93

7.87

7.75

650 \ 5.5

680 ! 6.2

700 i 6.6

450 | 8.34

450 8

450 i 7.9

450 i 7.9

460 I 7.9

460 | 7.9

460 ! 7.9

530 I 6

600 5.6

640 6

650 6.36

710 i 6.65

710 I 6.67

740 I 6.6

800 i 6.66

850 I 6.88

405 7.39

403 | 7.36

403 I 7.29

400 : 7.21

400 | 7.27

405 ; 7.3

410 i 7.3

410 I 7.24

410 | 7.25

420 I 6.91

440 I 5.28

550 i 5.72

550 | 5.93

620 1 6.1

620 1 6

600 j 5.4

670 1 3.75

700 | 3.7

381 ! 7.96

383 ! 7.82

388 i 7.51

390 \ 7.46

388 i 7.43

384 ! 7.35

395 ! 7.31

393 | 7.32

470 I 6.45

480 | 5.44

480 i 5.6

450 j 5.63

420 | 4.9

141
P7

P7

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

pg ......... ...,...._............. ....

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10 ,.....,.,. ... ...

P10

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

50 !

55

0

2

5

10

15

20

25

30

35

40

45

50

55

60 .,......__.........,..........

0

2

0

10

15

20

25

30

35

40 45--"-"-

50

0

2

5

10

15

20

25

30

35

40

45

0

2

5

10

15

20

25

30

35

40

14.18 [

13.17

17.75

17.7

17.68

17.67

17.67

17.65

17.35

16.91

16.24

15.7

15.02

14.03

12.89

11.4 

1(139

17.9

17.51

17.36

17.33

17.33

17.33

17.31

16.71

16.05

15.4 ..,....... ,__ .._

14.24

17.23

17.11

17.02

16.96

16.94

16.94

16.87

16.77

15.92

15.5

15.14

17.04

17.01

16.97

16.96

16.96

16.97

16.95

-j^g

16.92

16.45

7.76 450 I

7.73 508

8.15 ! 485

8.16 ) 482

8.16 ! 482

8.15 i 480

8.15 \ 480

8.14 I 485

7.96 1 540

7.91 | 580

7.91 ( 550

7.93 I 600

7.97 I 640

7.99 ; 640

7.96 | 650

7.84 | 670 ^ - -- ^ - "- 67o"'""""""-""--'-""

8.05 I 426

8.11 | 424

8.13 | 426

8.12 i 426

8.12 i 426

8.11 i 426

8.12 1 426

7 gg | 4gQ

7.87 \ 500

_^^7.89 I 600

7.92 | 640

8.38 i 448

8.38 ! 450

8.35 | 452

8.32 1 450

8.31 | 450

8.3 I 450

8.3 I 460

8.3 | 460

7.95 I 520

7.82 i 550

7.79 | 600

8.33 j 467

8.33 | 465

8.33 i 465

8.31 ; 465

8.31 ! 465

8.3 I 465

8.29 \ 465

8.23 I 720

8.3 ; 800

8.36 i 860

5.5

5.2

6.69

6.65

6.7

6.7

6.72

6.7

5.05

5.3

5.6

5.85

6.24

6.37

6.08

 jjs 4.52 " -- ----

7.33

7.22

7.06

7.03

7.04

7.07

7.07

5.2

5.5

5.7 -" 5785 - " 

6

8

8

7.75

7.7

7.7

7.75

7.75

7.75

4.9

4.2

3.8

7.38

7.34

7.32

7.25

7.37

7.36

7.4

6.2

6.4

6.8

142
P12

P12

P12

P12

P12

P13

P13

pi 3

P13

P13

P13

P13

P13

P13

P13

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

45 i

50

55

60

65

0

5

10

15

20

25

30

oo

45

55

0

2

5

10

15

20

25

30

35

40

45

50

55

60

15.78

15.48

14.42

13.4

12.19

16.98

17

16.96

16.98

17

17

17.28

16.73

15.72

14.31

16.87

16.92

16.87

16.84

16.79

16.79

16.77

16.67

16.57

16.24

15.45

15

14.19

14.14

8.34 860

8.33 ; 860

8.24 : 820

8.09 800

8.01 800

8.33 ; 505

8.33 ! 510

8.32 ! 510

8.32 i 520

8.32 i 520

8.32 1 520

8.23 1 760

8.38 1 800

8.37 ! 830

8.29 \ 830

8.43 1 615

8.46 1 615

8.47 ! 615

8.46 I 615

8.45 \ 620

8.45 1 620

8.45 1 630

8.45 I 650

8.45 I 710

8.46 I 720

8.48 i 800

8.48 1 800

8.48 i 850

! 8.48 ! 850

6.8

6.8

6.3

5.9

5.8

7.78

7.5

7.43

7.3

7.3

7.3

6

6.9

7.15

6.81

7.85

7.85

7.8

7.75

7.75

7.8

7.85

7.88

7.9

7.95

8.1

8.2

8.5

8.51

143
Table b. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for January 

1996.

Station Depth Temperature pH 

_______(m) (Centigrade)____

Conductance Dissolved Oxygen Dissolved Oxygen 

(us/cm)_____(mg/L)_____(%saturation)

P1 :

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P3

P3

P3

P3

P3

P3

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P6

P6

P6

0.5

3.7

6.4

8.6

13.4

19.5

25.5

32.2

39.5

50.1

62.5

74.4

0.7

5.8

13.6

19.6

27.9

36.4

42.2

50.4

60.6

69.3

75.9

84.1

0.5

5.6

10.1

20.1

30.3

38.2

0.3

4.7

10.3

20.1

30.2

40.0

49.8

60.4

74.5

80.6

94.2

6.2

2.9

! 6.9

10.98

10.92

10.90

10.89

10.89

10.88

10.88

10.87

10.85

10.82

10.79

8.20

11.22

11.22

11.21

11.21

11.18

11.14

11.13

11.09

10.90

9.74

8.63

7.89

11.17

10.64

10.62

10.59

10.56

10.13

11.57

11.39

11.37

11.35

11.35

11.34

11.24

10.83

8.66

8.10

7.69

10.80

10.81

10.80

8.68 :

8.67

8.67

8.67

8.67

8.67

8.67

8.67

8.67

8.67

8.67

8.33

8.65

8.65

8.64

8.64

8.64

8.65

8.65

8.65

8.64

8.41

8.34

8.26

8.70

8.71

8.70

8.70

8.70

8.72

8.69

8.68

8.68

8.68

8.67

8.67

8.61

8.47

8.34

8.31

8.24

8.63

i 8.64

I 8.64

617

617

618

618

618

618

618

618

617

618

617

867

620

621

621

622

623

623

623

622

633

799

846

892

620

g22

623

623

623

623

636

639

638

638

639

639

674

774

872

894

925

540

541

541

7.98

8.19

8.03

8.00

8.21

8.15

8.28

8.06

8.20

8.33

8.18

7.72

8.41

8.50

8.56

8.43

8.41

8.38

8.56

9.17

8.65

8.45

6.99

6.54

8.37

8.75

8.72

8.60

8.56

8.74

7.90

7.88

7.90

7.94

8.07

8.00

7.66

6.50

6.06

5.80

5.05

9.00

8.32

8.24

75.1

77.0

75.4

75.1

77.1

76.5

77.7

75.6

76.9

78.6

76.6

68.1

79.6

80.4

81.6 _ .

! 79.5

79.1

1 80.8

86.5

: 81.3

] 77.3

I 62.3

! 57.2

? 79.1

\ 81.6

! 81.3

i 80.1

I 79.7

I 80.7

i 75.3

I 74.8

I 75.0

I 75.3

I 76.6

| 75.9

i 72.5

I 61.0

I 54.1

i 51.6

I 44.6

! 84.3

I 77.9

i 77.2

144
P6 \

P6 !

P6 i

P6 I :::B::J

P6

P6

P6

P6

P6

P6

P6

P6 pg"

P7

P7

P7

P7

P7

P7

P7_

P7

P8

P8

P8

P8

P8

P8

P8

P9

P9

P9

P9

P9

P9

P9

P9

P9

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

10.5

15.1

21.3

26.8

34.0

38.8

45.5

51.8

59.1

67.1

74.7

83.5

92.6

98.3

0.5

8.0

16.8

27.3

39.2

49.7

54.1

58.8

61.6

0.4

2.3

8.6

13.5

16.6

18.7

19.2

1.1

4.1

9.7

20.7

30.0

40.5

50.1

60.3

66.8

1.0

5.2

10.1

20.3

29.6

39.7

45.4

51.8

60.1

70.0

81.8

10.78 !

10.78

10.78

10.79

10.78

10.77

10.77

10.19

10.59

10.65

10.08

9.13

8.15

8.00

10.68

10.41

10.41

10.40

10.39

9.35

8.30

7.79

7.73

9.23

9.22

9.11

9.08

8.84

6.76

6.62

10.59

10.62

10.63

10.64

10.61

10.62

10.85

10.26

9.78

10.80

10.82

10.82

10.83

10.84

10.79

10.76

10.31

9.42

8.42

8.06

8.63

8.63 ;

8.64 I

8.64 |

8.64

8.63 !

8.59 |

8.44 i

8.28

8.35

8.37

8.18

8.11

8.10

8.67

8.66

8.66

8.66

8.66

8.66

8.66

8.66

8.61

8.80

8.79 . __._..._

8.77

8.77

8.75

8.74

8.61

8.60

8.60

8.60

8.60

8.60

8.50

8.49

8.26

8.69

8.69

8.69

8.69

8.69

8.69

8.69

8.65

8.65

8.62

8.58

543 i

542 !

542

542

542

543

549

529

675

753

767

777

857

874

454

455

455

456

456

473

497

506

510

450

451

452

452

457

521

526

569

571

570

570

571

571

678

763

788

596

597

598

598

599

600

603

668

705

712

: 721

8.26 i

8.19

8.12

8.10

8.23

8.15

7.90

6.87

4.90

5.59

5.95

3.96

3.24

3.13

9.08

8.81

8.83

8.79

8.72

9.01

9.24

9.21

9.16

9.53

9.29

9.42

9.29

9.39

9.85

9.94

7.52

7.57

7.43

7.46

7.45

7.50

6.79

6.62

4.37

8.19

8.22

8.37

8.28

8.23

8.98

8.24

8.18

8.24

8.47

8.47

77.3

76.7

76.1

75.8

77.0

76.3

74.0

63.4

45.7

52.3

54.8

35.7

28.5

27.5

84.8

81.7

82.0

81.6

80.9

81.5

81.5

80.2

79.8

86.6

83.8

84.7

83.5

83.9

83.7

84.2

70.1

70.6

I 69.4

i 69.6

I 69.4

: 70.0

i 63.7

| 61.3

p I 40.0 Tgj 

! 77.0

j 78.4

i 77.7

| 77.1

| 84.1

\ 11 A

1 75.8

I 74.7

I 75.6

74.4

145
P10

P11

P11

P11

P11

P11

P11

P11

P11

P11

P12

P12

P12

P12

P12

p>12

P12

P12

P12

P12

P12

P12

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P14

P14

P14

P14

P14

P14

P14

P14

90.9 i

1.0

5.1

10.1

15.1

20.4

25.1

30.1

35.6

36.7

0.2

6.1

16.0

25.7

34.2

38.3

46.4

53.0

61.5

674

74.8

74.8

0.1

8.2

18.1

25.2 -gjy 

40.0

45.8

46.1

52.9

63.9

71.9

76.3

76.5

1.6

5.1

10.1

20.2

30.2

40.2

49.4

56.9

8.02

10.10

10.10

10.08

10.08

10.06

10.05

10.66

9.93

9.84

10.53

10.49

10.44

10.44

10.45

10.44

9.90

9.34

7.44

7.09

7.03

7.03

10.50

10.47

10.46

10.44

10.43

10.27

8.73

8.68

7.73

7.12

6.83

6.83

gg2

9.92

9.93

9.90

9.90

9.83

9.15

7.04

5.84

8.50

8.76

8.76

8.76

8.76

8.76

8.76

8.76

8.77

8.77

8.72

8.72

g72

8.71

8.71

8.71

8.70

8.71

8.71

8.71

8.69

8.70

8.71

gylj

8.71

8.71

8.71

8.71

8.71

8.71

8.70

8.70

8.69

8.67

8.65

8.73

8.73

8.73

8.73

8.73

8.74

8.74

8.74

745

561

564

564

564

564

564

564

563

563

571

572

572

572

575

575

612

625

683

694

695

694

577

580

580

580

581

592

640

640

677

694

700

700

702

582

583

584

584

586

605

692

! 737

8.07

8.45

8.44

8.60

8.68

8.52

8.55

8.63

8.66

8.67

8.65

8.71

8.55

8.53

8.59

8.59

8.66

8.82

9.39

9.49

9.50

9.91

8.70

8.66

8.69

8.66

8.71

8.72

9.26

9.14

9.36

9.65

9.72

9.55

9.69

8.96

9.06

9.06

8.97

8.95

9.26

! 9.82

! 10.25

70.8

77.8

77.8

79.2

79.9

78.4

78.7

79.4

79.5

79.4

80.5

81.0

79.4

79.2

79.8

79.8

79.4

79.9

81.2

81.4

81.3

84.8

80.9

80.5

80.8

80.5

80.9

80.7

82.7

81.4

81.5

82.8

82.8

81.4

82.6

82.2

83.2

83.1

82.3

82.0

83.5

84.1

85.2

146
Table c. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for May 

1996.

Station Depth Temperature pH Conductance Dissolved Oxygen Dissolved Oxygen 

_______(m) (Centigrade)_________(us/cm)_____(mg/L)_____(% saturation)

P1 :

P1

P1

P1

P1

P1

P1

Pi

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

0.1

1.1

2.1

3.0

4.1

5.0

6.0

7.0

8.0

9.0

11.1

13.1

14.0

19.0

24.1

29.6

34.2

39.1

442

49.1

53.9

59.0

64.2

69.0

74.2

79.1

84.0

89.1

94.6

98.2

0.1

1.0

2.0

3.0

4.1

5.1

6.1

7.6

8.1

9.1

10.0

14.1

18.9

24.0

15.81

15.49

15.19

14.97

14P

1478

1454

14.39

14.30

14.09

13.74

12.95

12.90

12.15

11.29

10.97

10.75

10.62

10.47

10.28

9.83

8.96

7.95

7.79

7.75

7.75

7.83

7.85

7.88

7.85

16.86

16.51

16.17

15.86

15.57

15.42

15.35

15.25

15.00

14.26

14.01

12.33

11.79

11.12

8.40

8.41

8.42

8.42

8.42

8.42

8.41

8.41

8.40

8.39

8.34

8.26

8.25

8.17

8.06

8.01

7.98

7.98

7.95

7.93

7.87

7.83

7.80

111

7.74

7.69

7.64

7.58

7.56

7.53

8.48

8.47

8.46

8.43

8.41

8.40

8.42

8.43

8.43

8.41

8.37

8.16

8.07

7.99

680

681

682

682

682

682

682

681

682

681

681

682

683

684

689

691

693

696

695

700

716

736

771

786

800

830

859

890

911

940

681

680

680

679

679

679

679

679

678

680

679

682

683

687

9.74

9.84

9.92

9.99

10.05

10.07

10.11

10.13

IQ^

10.11

10.01

9.68

9.59

9.25

8.79

8.51

8.39

8.37

8.21

8.10

111

7.70

7.69

7.5~3

7.25

6.79

g ^2

5.42

5.12

46i

10.11

10.12

10.12

10.11

10.11

10.05

10. 19

10.29

10.32

10.31

10.07

9.35

8.90

8.53

101.9

102.2

102.4

102.7

102.9

103.0

102.9

102.8

102.4

101.9

100.1

95.1

94.1

89.3

83.1

80.0

78.4

78.0

76.3

74.9

71.1

69.0

67.3

65.6

63.1

59.1

53.4

47.3

44.7

40.3

108.1

107.4

106.6

105.8

105.2

104.2

105.6

106.4

106.1

104.2

101.3

90.6

85.2

80.4

147
P2 | 29.1 i

P2 I 34.1 !

P2 i 39.1 !

P2 | 44.0 |

P2 l 49.3

P2 | 541

P2 | 59.3

P2 i p.l

P2 I 69.3

P2 j 74.4

P2 j 78.9

P2 | 343

P2 I 89.1

P2 | 94.3

P2 i 97.0

P3 ! 6.6

P3 ; 1.1

P3 | 2.6

P3 \ 2.8

P3 | 4.1

P3 | 43-

P3 6.1

P3 | 6.8

P3 ! 8.0

P3 i 9.2

P3 j 14.0

P3 I 19.1

P3 | 24.2

P3 i 28.6

P3 I 34.4

P3 I 35.3

P4 j 0.2

P4 i 2.1

P4 | 3.0

P4 I 4.1

P4 | 5.0

P4 i 6.0

P4 i 7.3

P4 | 8.0

P4 i 9.6

P4 i 14.6

P4 I 19.0

P4 j 24.1

P4 I 29.0

P4 | 34.7

P4 | 39.0

P4 i 44.1

P4 i 48.9

P4 j 54.3

P4 I 59.2

10.71

10.49

10.27

10.10

9.71

9.16

8.46

8.05

7.85

7.74

7.64

7.64

7.71

7.77

7.81

15.78

15.49

15.45

15.38

15.25

15.09

15.07

14.93

14.82

14.10

12.77

12.01

11.69

11.32

10.59

10.57

15.23

15.22

15.18

15.16

15.14

15.11

14.83

14.54

13.70

12.24

11.66

10.99

16.58

10.38

10.28

10.06

9.86

9.51

9.18

7.95

7.92

7.89 :

7.87 !

7.85

7.83

7.82

7.81

7.80

7.78

7.76

7.71

7.64

7.57

7.52

8.38

8.38

8.37

8.37

8.37

8.36

8.36

8.36

8.35

8.32

8.19

8.09

8.04

7.98

7.88

7.88

8.37

8.37

8.37

8.37

8.37

8.37

8.35

8.33

8.29

8.16

8.10

8.03

7.98

7.95

794

7.92

7.90

7.87

i 7.85

691 \ 8.32 !

695 I 8.20 j

703 i 8.04 I

707 ) 7.93 i

712 ; 7.89 ;

717 I 7.89 !

734 I 7.95 i

747 i 8.01 |

757 ! 8.02 i

768 1 7.93

783 i 7.76

808 1 7.38

853 | 6.68

896 I 5.87

924 ; 4.86

681 S 9.49

680 i 9.53

679 ; 9.58

679 i 9.56

679 ! 9.60

679 i 9.63

678 I 9.64

679 | 9.66

680 ! 9.67

680 i 9.70

682 j 9.26

684 | 8.74

686 | 8.48

689 I 8.12

700 j 7.70

700 I 7.59

676 | 9.58

676 i 9.61

676 i 9.63

677 \ 9.64

676 I 9.64

675 i 9.64

678 I 9.68

678 ! 9.62

681 j 9.55

682 | 9.17

682 I 8.92

678 i 8.63

681 i 8.44

681 j 8.34

685 i 8.24

691 | 8.12

696 i 8.05

703 I 7.95

716 i 7.88

77.7

76.2

74.4

73.0

72.0

71.0

70.4

70.2

70.0

69.0

67.4

64.1

58.1

51.1

42.4

99.2

99.0

99.4

99.1

99.2

99.2

99.2

99.1

99.0

97.8

90.6

84.1

81.0

76.9

71.7

70.7

98.9

99.2

99.3

99.4

99.4

99.3

99.2

97.9

954

88.7

85.2 81~ 2

78.6

77.3

76.1

74.7

73.7

72.2

71.0

148
P4

P4

P4

P4

P4

P5

P5

P5

P5

P5

P5

P5

P5

pg

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

64.3

69.2

74.1

79.2

82.0

0.2

1.0

2.0

3.0

4.1

5.0

6.1

6.9 !

8.0 ;

9.1 I

9.9

11.1

12.1

13.0

13.9

14.9

19.1 ;

245

28.9

34.6

39.4

43.8

49.3

54.6

59.2

649

69.6

74.4

78.7

84.8

89.4

94.2

96.5

0.0

6.7

2.2

3.1

4.1

5.0

6.0

7.1

8.1

8.9

13.8

..._18-.L......

8.67

8.10

7.92

7.59

7.59

15.95

15.94

15.80

15.73

15.65

15.55

15.41

15.22 ^ 5/jy

15.14

15.00

14.92

14.82

14.78

14.66

14.42

12.39

11.04

10.33

10.10

9.81

9.54

9.22

8.96

8.71

8.34

8.08

7.83

7.60

7.41

7.28

7.27

7.33

16.44

16.36

16.32

15.95

15.81

15.61

15.41

15.16

15.12

14.97

13.62

12.69

7.82 ;

7.80

7.78

7.75

7.72 ;

8.32

8.32

g32

8.32

8.32

8.32

8.32

8.31

8.31

8.31

8.30

8.30

8.29

8.29

8.28

8.27

8.15

8.06

8.03

8.01

8.00

8.66

8.00

8.00

8.66

7.98

7.97

7.96

7.93

7.90

7.84

7.76

7.66

8.33

8.32

8.32

8.31

8.31

8.30

8.29

8.29

8.28

8.28

8.21

i 8.14

734

756

767

797

807

659

659

658

657

655

652

653

655

655

655

654

655

653

653

653

653

638

629

629

628

632

638

654

672

692

719

737

752

766

776

799

831

873

638

636

636

638

638

637

638

640

638

638

637

624

7.78

7.76

7.67

7.45

7.20

9.16

9.14

9.16

9.18 

9.23

9.25

9.22

9.22

9.21

9.21

9.20

9.20

9.20

9.17

9.15

9.06

8.88

8.79

8.70

8.65

8.66

8.69

8.72

8.75

8.78

8.80

8.77

8.67

8.63

8.25

7.76

6.73

9.44

9.45

9.44

9.49

9.49

9.49

9.49

9.51

9.49

9.49

9.35

9.17

69.3

68.1

67.0

64.6

62.4

96.1

95.9

95.8

95.9

96.0

96.0

95.9

95.2

95.1

95.0

94.6

94.4

94.1

94.1

93.6

92.8

87.9

83.6

81.3

80.0

79.1

78.7

78.4

78.2

78.0

77.5

77.2

76.5

75.2

74.5

71.0

66.8

58.0

100.0

99.9

99.8

99.5

99.2

98.9

98.4

98.1

97.8

97.4

93.2

89.6

149
.,.. ._..,....,,...

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6 pj 

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

23:5

29.2

344

38.8

43.5

48.8

54.2

59.1

63.7

69.2

73.7

78.9

84.0

88.7

93.8

97.6

 Qj 

0.9

2.0

3.1

4.1

6.0

7.0

8.0

9.0

10.0

11.0

12.3

13.0

14.1

19.1

24.0

29.0

34.1

39.1

44.5

49.0

54.2

58.4

6.1

1.0

,,9

3.0

3.9

4.9

6.0

7.1

7.9

i 8.8

11.3

._...... _,._,

10.28

9.78

9.43

9.22

9.01

8.61

8.28

8.12

7.77

7.75

7.84

7.80

7.75

7.66

7.62 

16.30

16.16

16.12

16.05

15.99

15.82

15.72

15.47

15.10

14.85

14.73

14.01

13.35

13.10

11.62

10.29

9.93

9.63

9.29

9.01

8.91

8.74

8.50

16.91

16.65

16.66

16.56

16.52

16.48

16.43

16.42

} 15.89

15.69

I 14.97

""""""""8.03"""""""""

7.98

7.95

7.92

7.91

7.89

7.88

7.87

7.88

7.80

7.72

7.64

7.62

7.60

7.54

7.46 

8.39

8.39

8.39

8.39

8.39

8.38

8.38

8.38

8.36

8.35

8.34

8.31

8.26

8.23

8.13

8.05

8.00

7.97

7.94

7.89

7.85

7.81

7.70

8.42

8.43

8.43

8.43

8.43

8.43

8.43

8.43

| 8.42

I 8.40

I 8.31

571

567

561

556

556

557

567

602

640

695

728

766

781

799

863

913 

524

524

523

523

523

522

523

522

521

521

521

522

522

522

521

522

528

534

546

561

571

585

621

556

559

559

560

561

561

559

559

556

578

631

9.66

8.84

8.73

8.62

8.56

8.53

8.50

8.51

8.56

8.34

7.40

6.58

6.33

6.14

5.58

4.27 --g-Jg "-

9.18

9.21

9.25

9.29

9.39

9.37

9.44

9.49

949

948

9.45

9.37

9.29

9.01

8.86

8.58

: 8.47

8.29

8.03

7.65

7.20

5.98

9.38

9.49

9.51

9.52

9.52

9.54

9.56

9.56

9.59

9.48

9.13

'"""""""""""84:5""""""""""" ""

81.7

79.8

78.0

77.1

76.5

75.4

75.0

75.1

72.6

64.4

57.4

55.2

53.4

48.5

37.1 ... .................. Q6_

96.7

96.9

97.2

97.4

98.2

97.8

97.9

97.7

97.2

96.8

95.0

92.9

91.5

85.9

81.9

78.6

77.1

74.8

72 0

68.4

64.1

52.9

100.4

101.0

101.2

101.1

101.1

101.2

101.3

101.2

100.4

98.9

93.7

150
............._ ...............

P8 ! __.__..._

P8

P8

P8

P8

P8

P8

P9

P9

P9

P9

P9

P9

P9 ., ......__..........,

P9

P9

P9

pg

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P10

P10

P10

P10

P10

P10

_ 

P10 ^^,,

P10

P10

P10

P10

P10

P10

pjO

13.1 j

14.5

17.9

18.8

21.2

23.6

25.3

27.7

29.1

0.9

2.1

3.6

4.2

5.1

5.9

7.0 

8.3

8.8

11.1

13.0

15.4

18.0

20.4

221

25.0

28.1

34.0

39.6

43.8

48.7

54.4

59.2

63.1

69.3

73.6

0.0

1.1

2.2

3.1

4.1

5.0

6.0 ____

8.1

9.6

11.6

13.0

15.5

17.0

\ 18.9

14.71

14.42

13.45

13.13

12.31

11.63

11.30

10.80

10.57

17.38

16.98

16.72

16.05

15.85

15.05

14.90 

1479

14.64

14.07

13.81

13.38

12.79

12.14

11.97

11.54

11.02

10.20

9.60

9.37

9.21

9.14

9.10

8.90

8.71

8.67

16.96

16.78

16.54

16.27

15.75

15.54

15.40 ,_. .__

15.07

14.96

14.09

I 13.86

i 12.98

I 12.91

! 12.62

8.27 627 ;

8.24 616

8.13 ; 593

8.08 ; 574

7.96 ; 569

7.87 j 577

7.82 | 574

7.78 | 569

7.73 | 567

8.43 ; 632

8.43 | 633

8.43 j 633

841 634

8.41 634

8.36 635

8.35 634 --"-y~2^- p---""""-~634 " 

8.33 | 634

8.30 636

8.28 636

8.24 636

8.19 635

8.14 | 633

8.13 i 632

8.11 i 632

8.09 I 628

8.66 ! 606

7.93 | 586

7.90 i 584

7.87 I 607

7.80 | 670

7.58 I 753

754 j 794

7.58 \ 794

7.61 } 791

8.32 i 633

8.32 ! 636

8.32 \ 634

8.31 I 632

8.31 632

8.30 j 631

8.30 j 631 __ p __

8.28 ! 629

8.27 i 629

| 8.24 | 629

| 8.23 i 629

i 8.18 j 632

i 8.18 I 633

I 8.17 1 633

8.78 i

8.74 I

8.64 j

8.20

7.75

7.86 ._________

6.99

6.59

8.96

9.06

9.18

9.27

9.29

9.26

9.28 

9:25

9.28

9.25

9.14

8.98

8.85

8.78

8.74

8.68

8.61

8.19

7.79

7.63

7.42

6.92

4.58

3.94

4.55

4.53

; 8.95

8.90

9.66

8.99

9.03

9.03

9.01 ____ ,

9.00

9.02

8.94

8.90

8.81

8.80

8.74

89.6

88.6

85.8

80.9

75.1

75.0

70.3

65.3

61.3

96.8

97.1

97.9

97.4

97.2

95.3

95.1 ,.......,........,.,,.^_.................. ............

94.6

93.2

91.6

89.1

86.6

84.7

84.0

82.6

81.0

75.5

70.9

69.0

66.9

62.3

41.1

35.2

40.5

40.3

95.8

95.0

95.6

94.9

94.3

93.9

93.4 __. 

g~2_g

92.6

90.0

89.2

86.6

86.4

i 85.2

151
PI 6 !

P10 I

P10 I 

P10

pjO

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

PH

PH

PH

PH

pii

PH

PH

PH

PH

PH

PH

PH

PH

PH

PH

PH

PH

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

21.2 I

22.9

24.8 

27.6

29.0

34.2

39.1

43.9

48.6

54.5

60.4

64.8

70.6

74.4

79.0

83.7

88.4

93.5

98.4

0.0

1.1

1.9

_ 

2.7 __ 

5.2

6.2

6.8

8.3

9.2

11.3

13.9

18.8

23.8

28.6

33.8

36.6

0.2

1.0

1.6

3.6

4.1

4.7

5.8

7.1

8.1

8.8

13.1

14.5

19.6

j 24.6

12.15

12.01

11.41 

11:69

1Q77

10.39

10.03

9.75

9.46

9.22

8.95

8.72

8.32

8.06

7.93

7.68

7.49

7.46

7.44

17.95

17.86

17.46

17.04

16.44

15.54

15.00

14.80

14.53

14.19

13.51

12.97

12.61

12.14

11.58

10.83

10.38

16.40

16.37

16.27

16.33

16.16

16.06

15.73

15.45

15.30

15.24

14.22

14.14

13.72

12.75

8.14

8.13 i

8.11 

8:16

8.08

8.07

8.05

8.04

8.03

8.02

8.01

8.00

7.99

7.98

7.97

7.94

7.90

7.86

7.81

8.41

8.41

8.40

8.39

8.38

8.36

8.34

8.33

8.32

8.31

8.29

8.26

8.23

8.19

8.15

8.09

8.04

8.31

8.31

8.31

8.31

8.31

8.31

8.30

8.30

8.29

8.29

Q22

8.21

8.18

I 8.12

630 :

631

632 

632

632

635

639

646

662

678

697

709

733

749

759

776

796

808

818

633

633

633

635

635

636

638

641

639

638

634

632

634

632

634

639

644

651

650

649

650

652

652

654

656

660

662

699

705

707

706

8.65

8.67

8.64 .....................,,^._......_...

8.63

8.59

8.53

8.53

8.51

8.46

8.49

8.52

8.57

8.53

8.52

8.52

8.37

8.19

7.81

8.42

8.46

8.51

8.53

8.63

8.75

8.74

8.70

8.73

8.73

8.79

8.68

8.50

8.38

8.27

8.09

7.87

8.82

8.83

8.83

8.84

8.84

8.82

8.81

8.77

8.85

I 8.82

: 8.73

j 8.70

j 8.64

! 8.48

83.5

83.4

82.0 ~-----gY;g -

80.7

79.6

78.4

77.8

77.1

76.3

76.1

75.9

75.6

74.8

74.5

74.0

72.4

70.8

67.5

92.6

92.4

92.1

91.6

91.5

91.0

89.8

89.0

88.9

88.1

874

85.3

82.9

80.9

78.8

75.8

72.9

93.4

93.4

93.2

93.5

93.2 _ 

92.0

91.0

91.6

91.1

88.2

87.8

86.4

83.6

152
P12

P12

P12 ., .......___.............

P12

P12

P12

P12

Pi 2

P12

pj2

P12

P12

pi 3

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P14

P14

P14

P14

P14

P14

P14

P14

P14

29.1

32.7

39.4 

44.2

48.4

54.0

59.5

65.1

69.2

74.4

79.1

84.4

86.5

0.1

1.1

1.8

3.1

4.1

5.4

6.3

6.6

8.3

8.4

11.6

12.8

14.6

17.4

19.4

24.3

29.7

34.3

39.7

43.5

49.7

54.6

59.7

63.4

69.5

73.2

79.4

79.6

0.3

0.9

1.8

2.8

3.8

5.8

8.1

10.8

14.6

11.68

10.96

10.62 

iO.51

10.32

10.09

9.70

9.36

9.07

8.64

8.34

8.22

8.38

15.79

15.71

15.42

15.21

15.05

14.65

14.46

14.42

14.38

14.37

14.21

14.11

13.98

13.83

13.72

13.24

12.77

12.26

11.04

10.62

10.22 

9.91

9.77

9.20

8.87

8.69

8.69

16.56

16.55

16.55

16.42

16.30

16.19

15.94

15.82

15.43

8.10

8.07

8.06 

8:d5

8.04

8.02

7.99

7.96

7.95

7.94

7.91

7.88

7.88

8.29

8.28

8.27

8.26

8.25

8.23

8.20

8.19

8.19

8.19

8.18

8.17

8.18

8.17

8.15

8.11

8.08

8.07

8.06

8.02

8.01

8.00

7.97

7.95

yg.j

7.87

111

7.70

8.40

8.40

8.40

8.38

8.35

8.33

8.27

8.25

8.18

708 !

712 I

721 | "726"""""""""""1

743

763

784

793

792

791

790

789

788

689

691

695

698

700

705

703

702

702

702

702

702

708

707

706

702

706

710

715

748

755

762

794

798

804

803

807

810

654

654

654

649

646

641

630

643

! 628

8.42

8.35

8.39 ...............,... ...._..,. ,..............,....,

8.20

8.14

8.05

7.95

7.85

7.92

7.87

7.65 j

7.54 \

9.00 f

8.96

8.91

8.93

8.81

8.84

QJ1

8.72

8.67

8.68

8.66

8.61

8.61

8.63

8.57

8.50

8.49

8.37

8.38

8.23

8.25

8.14

8.04

7.85

7.76

7.53

7.29

6.29

9.18

9.20

9.22

9.18

9.13

8.94

872

8.59

8.43

80.4

78.4

78.2 ............... ....__.... .................

75.9

74.9

73.5

71.9

70.6

70.5

69.5

67.4

66.6

94.1

93.6

92.4

92.2

90.7

90.2

88.5

88.5

87.9

88.1

87.5

86.8

86.6

86.4

85.7

84.0

83.1

81.1

78.9

76.7

76.2

74.9

73.7

71.7

70.0

674

65.0

56.6

97.5

97.7

97.9

97.3

96.5

94.2

91.4

89.9

87.5

153
P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

17.9

19.8

23.1

25.4

28.1

31.3

31.5

34.5

40.2

46.0

51.6

55.8

15.14

14.70

14.04

13.70

12.77

12.15

12.19

11.83

11.16

10.80

10.46

10.39

8.13

8.12

8.09

8.08

8.05

8.01

8.01

7.98

7.91

7.92

7.82

7.81

620

650

678

686

686

683

682

694

741

768

804

808

8.32

8.22

8.26

8.17

8.22

8.19

8.16

8.04

7.16

7.12

6.40

6.32

85.8

83.9

83.1

81.6

80.4

79.0

78.8

77.1

67.6

66.7

59.5

58.6

154
Table d. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for August 

1996.

Station Depth Temperature pH Conductance Dissolved Oxygen Dissolved Oxygen 

____(m) (Centigrade)_________(us/cm)_____(mg/L)_____(%satu ration)

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

PI

P1

P1

P1

P1

P1

P1

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

 

0-7,, I 2;6"-~

4.0

5.7

8.2

10.7

12.6

14.9

16.9

20.0

233

25.9

29.8

35.1

39.9

45.5

49.9

55.0

60.8

65.5

69.9

76.6

80.8

88.2

98.9

0.8

3.0

5.3

8.6

8.2

8.3

10.6

12.3

14.8

18.1

21.6

24.8

29.9

36.1

39.8

45.4

52.0

60.5

65.6

26.63 |

26.44 \

25.99

25.28

25.08

24.52

21.20

19.84

18.89

18.02

16.92

16.33

15.16

13.43

12.60

12.05

11.58

11.07

10.43

9.75

9.18

8.17

8.01

7.87

7.84

2g23

26.25

26.22

25.36

25.33

25.11

22.73

20.96

19.59

18.45

17.31

16.56

15.11

13.30

12.65

11.89

11.13

10.26

9.82

8.52 I

8.54

8.56

8.57

8.59

8.58

8.51

8.39

8.30

8.22

8.14

8.11

8.02

7.95

7.93

7.92

7.92

7.93

7.97

8.00

8.00

7.94

7.93

7.88

7.79

8.57

8.58

8.58

8.61

8.62

8.62

8.61

8.47

8.19

8.05

7.96

7.96

8.01

7.98

7.96

7.94

7.94

8.01

i 8.01

686

686

686

685

683

682

685

688

686

683

688

693

694

696

699

702

701

694

682

682

704

783

798

828

889

680

680

681

678

677

677

660

657

639

635

639

656

679

684

688

697

691

671

678

8.18 I

8.15

8.05

8.29

8.68

8.82

9.13

8.07

7.60

7.23

6.95

6.86

6.63

6.60

6.58

6.59

6.63

6.77

7.11

7.45

7.55

7.41

7.28

6.79

6.33

8.43

8.40

8.37

8.85

9.27

9.23

10.04

9.03

7.01

6.48

6.14

6.20

6.68

7.01

7.05

6.99

6.95

7.62

7.76

107.9

107.1

105.0

106.7

111.3

111.9

108.8

93.6

86.5

80.9

76.0

74.1

69.9

66.9

65.4

64.8

64.5

65.1

67.4

69.5

69.4

66.6

65.1

60.5

56.4

110.4

110.1

109.6

114.0

119.5

118.4

123.1

107.1

80.8

73.1

67.6

67.3

70.3

70.9

70.2

68.5

1 66.9

71.8

j 72.4

155
P2

P2

P2

P2

P2___

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P5

P5

P5

P5

P5

P5

P5

P5

P5

69.9

74.2

81.2

90.5

94.5 pp 

1

2.6

4.8

7.2

9.3

10.4

12.6

14.5

18.5

194

22.3

25.3

29.0

33.9

37.5

39.5

0.7

2.8

5.0

6.9

9.1

10.5

12.6

14.9 

20.8

25.4

30.9

35.4

41.1

46.5

51.0

60.2

70.2

80.1

82.4

0.8

2.5

4.7

6.7

8.2

10.4

12.4

14.2

I 16.2

9.28 f

8.76

8.23

7.82

7.78 

2f:68

2g 71

26.72

26.57

24.99

24.11

22.76

21.18

18.96

18.27

17.55

16.89

15.73

13.92

13.03

12.66

27.07

27.07

26.95

25.91

24.15

23.24

21.71

19.96

18.57

17.49

16.56

14.83

13.25

12.20

11.40

10.78

10.06

9.37

8.41

8.31

26.41

25.96

25.67

25.17

24.96

24.64

23.29

20.90

20.32

8.02 !

8.00

7.96

7.89 i

7.87 ____,

8.55 I

8.55

8.55

8.57

8.57

8.50

8.39

8.20

8.13

8.06

8.02

7.98

7.86

7.83

7.84

8.62

8.62

8.63

8.64

8.57

8.64

8.39

8.03

7.87

7.89

7.90

7.96

7.96

7.97

7.96

7.97

7.99

8.00

7.93

7.93

8.73

8.75

8.76

8.74

8.71

8.66

8.40

7.88

i 7.84

697 !

729

779

832

848 _____

680

680

680

674

667

673

681

685

683

684

685

689

700

703

704

661

661

661

661

649

616

583

577

578

610

632

669

669

676

684

680

673

691

765

775

581

580

579

580

582

577

543

478

473

7.83

7.85

7.69

6.95

6.67 .__ .

8.32

8.32

8.42

9.18

9.47

9.50

8.44

6.87

6.51 g 2g

6.12

6.01

5.31

5.19

5.26

8.46

8.53

8.55

9.01

9.40

10.67

8.30

6.33

5.83

5.87

6.02

6.58

6.96

7.19

7.29

7.40

7.57

7.76

7.61

7.37

8.66

8.77

8.91

8.78

8.50

8.05

gg2

j 5.40

i 5.38

72.2

71.5

69.2

61.9

59.3 , ,.,^..^^

109.9

109.9

110.9

117.5

119.3

116.7

100.5

78.3

73.1

68.6

66.9

64.1

54.4

52.2

52.4

112.5

113.4

113.5

117.3

118.4 _»

99.9

73.6

65.9

64.9

65.3

68.8

70.3

70.9

70.6

70.6

71.0

71.7

68.7

66.4

113.7

114.3

115.4

112.8

108.8

102.3

82.1

64.0

63.0

156
PS :

P5 i

P5

P5

P5

P5

P5

P5

P5

P5

P5

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

18.7 19.18

21.1 | 18.10

25.7 i 16.41

31.0 ! 14.45

36.7 I 12.98

45.3 : 11.50

51.6 1 10.65

60.5 1 9.59

69.5 \ 9.08

81.1 i 8.29

97.9 ! 7.57

1.0 i 26.07

2j | 26.10

4.6 \ 25.86

6.2 ! 25.78

8.3 ! 25.74

10.2 ! 25.41

12.4 i 24.56

14.4 ) 21.85

17.3 i 20.51

20.4 I 19.21

25.5 i 16.70

30.4 I 14.29

35.3 I 12.72

40.5 11.68

46.9 | 10.39

52.5 \ 9.81

57.0 ! 9.48

65.6 | 9.00

75.6 I 8:29

85.6 I 8.06

98.0 j 7.78

1.6 ) 26.93

3.4 i 26.69

6.3 | 26.31

8.6 26.08

10.5 I 25.36

12.5 i 23.82

15.5 j 21.28

18.4 i 19.51

20.6 : 18.44

23.3 i 17.45

27.8 j 15.44

31.3 i 13.91

i 36.7 i 12.05

! 41.7 ; 11.06

! 47.5 ! 10.28

! 55.6 | 9.57

I 60.4 i 9.32

| 63.3 I 9.33

7.84

7.85

7.87

7.96

8.02 ;

8.03

8.05

8.05

8.06

8.06

7.94

8.66

8.66

8.67

8.67

8.68

8.68

8.58

8.32

7.98

7.98

7.86

7.96

7.98

8.00

7.99

7.98

7.97

7.93

7.88

7.80

7.81

8.56

8.57

8.58

8.58

8.45

7.95

7.71

8.01

7.99

7.97

7.90

7.83

7.82

7.82

7.84

7.75

7.65

7.61

505

546 ;

561

644

662

655

652

613

669

760

844

590

591

591

591

590

588

586

591

556

591

606

589

602

599

559

548

552

573

652

741

808

557

556

557

554

519

461

467

588

604

623

582

593

562

557

557

572

! 584

! 592

5.40

5.40

5.94

6.46

7.05

7.34

7.62

7.84

7.94

7.99

7.14

8.44

8.50

8.53

8.59

8.56

8.50

7.95

7.22

5.52

5.56

5.71

6.77

7.29

7.55

7.74

7.79

7.78

7.47

7.11

6.13

5.97

7.93

8.24

8.32

8.28

7.19

3.88

2.80

5.30

5.59

5.83

6.21

6.02

6.24

6.41

6.58

6.04

4.70

4.43

61.8

60.4

64.2

66.9

70.7

71.3

72.6

72.8

72.8

72.0

63.2

110.2

111.0

111.0

111.6

111.1

109.6

101.0

87.1

64.9

63.7

62.1

70.0

72.7

73.5

73.2

72.7

72.1

68.4

64.6

54.9

53.1

105.1

108.8

109.1

108.1

92.6

48.6

33.3

61.0

63.6

64.4

65.7

61.6

61.3

61.6

I 62.1

! 56.0

i 43.3

i 40.9

157
P8

P8

P8 .................,__ .......

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P9

__E§__

P9

P9

pg

P9

pg

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

0.9

3.7

6.5 ~ 8 A 

~

10.4

125

144

16.7

18.6

20.5

22.5

24.3

26.7

30.8

34.3

0.8

2.5

4.6

6.6

8.5

10.5

12.0

14.2

16.6

18.5

20.6

22.2

24.7

26.8

28.5

30.5

35.5

40.4

45.7

50.4

54.8

57.6

0.7

3.0

6.3

8.5

11.6

13.9

15.7

17.3

20.1

23.2

25.9

30.3

j 35.7

26.74

26.74

26.29 

26.16

26.08

24.47

21.49

19.69

18.62

18.06

17.35

16.99

16.18

14.41

13.31

27.33

26.78

26.55

26.41

25.36

24.55

23.51

2i 50

2Q7g

20.15

19.72

18.86

17.94

17.03

16.49

15.57

13.42

12.26

11.16

1Q42

9.92

j 9.70

27.07

26.79

26.07

25.37

24.23

21.45

20.53

20.08

19.54

18.36

16.66

15.12

12.84

8.55

8.56

8.55 i

18.48 f 1

8.45 i

7.57

7.56

7.55

7.62

7.66

7.74

7.70

7.58

7.46

7.44

8.67

8.69

8.69

8.69

8.68

8.55

8.40

7.97

7.83

7.80

7.82

8.05

7.98

8.00

8.03

8.05

8.02

8.02

8.00

7.97

7.92

7.88

8.68

8.69

8.70

8.57

8.23

7.77

7.76

7.77

7.79

7.80

7.84

7.92

i 8.02

492

493

494 

496

498

540

480

503

559

586

614

629

658

664

647

592

593

594

593

559

553

566

528

503

500

535

648

658

652

645

637

637

643

632 622

617

622

531

531

533

540

506

464

461

464

478

530

558

582

656

8.11 |

8.18

 

7.99 y;55 - "" - -" ~~~

7.33

0.64

0.28

0.62

2.47

3.15

3.95

3.83

2.47

6.93

0.71

8.79

8.92

8.98

8.94

9.15

8.35

7.70

5.62

5.07

5.01

4.98

6.08

5.93

6.25

6.51

7.08

7.32

7.56

7.56

7.38

7.04

6.59

8.50

I 8.67

i 8.76

7.40

6.02

5.08

5.31

5.48

5.56

5.49

5.94

6.71

7.41

107.1

108.0

104.7

Toao

95.7

8.2

3.3

7.1

28.0

35.2

43.5

41.9

26.6

9.6

7.2

117.3

117.9

118.3

117.4

117.9

106.0

95.9

67.3

59.8

58.4

57.6

69.1

66.2

68.5

70.5

75.3

74.1

74.7

72.9

69.8

65.9

61.3

113.6

114.6

114.3

95.4

76.6

60.8

62.4

63.8

64.1

61.8

646

70.6

i 74.2

158
PI 

0

Pi 6 ;

P10

P10

P10

P10

P10

P10

P10

PH

PH

PH

PH

pii

PH

PH

PH

PH

PH

PH

PH

PH

PH

PH

pn

PH

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

406

45.8

50.5

55.7

61.1

69.4

81.2

88.5

97.8

0.9

3.6

5.4 \

7.5 !

9.4 !

11.4 !

13.6 j

15.6

16.9

18.8

20.5

22.8

25.6

29.2

34.0

39.3

41.2

1.4

3.3

5.4

7.3

9.1

10.4

11.5

12.6

13.3

15.4

17.4

19.3

22.4

25.6

30.6

35.5

40.9

46.2

51.5

56.7

63.9

70.1

78.9

I 90.4

11 gQ j

11.00

10.51

10.01

9.62

9.30

8.38

8.00

7.74

26.70

26.50

26.21

26.03

25.61

24.88

23.13

21.38

20.71

20.26

19.89

18.98

17.21

15.79

13.69

12.35

11.96

26.24

26.08

25.99

25.90

25.39

25.19

25.10

24.84

24.62

21.82

20.52

19.87

19.04

17.07

14.29

12.36

11.45

10.79

10.50

10.35 ._

9.94

924

8.39

"8.05""

8.06

8.06

8.07

8.08

8.09

8.06

8.00

7.87

8.76

8.77

8.74

8.71

8.53

8.16

7.80

7.73

7.73

7.73

7.71

7.66

7.75

7.79

7.85

7.83

7.83

8.71

8.70

8.67

8.63

8.48

8.40

8.38

8.30

8.25

7.79

7.74

7.75

7.77

7.79

7.96

8.07

8.09

8.11

8.11

8.10

8.05

8.00

7.89

7.76

653 1

647 i

644 1

649

669

713

772

796

843

515

515

508

502

508

498

492

494

496

498

513

557

613

627

658

673

679

504

505

506

506

508

508

507

506

503

470

451

447

452

486

614

683

684

691

701

732

774

797

; 811

! 801

'yes""""""""""""]

7.91

8.01

8.12

8.17

8.25

8.28

7.61

7.27

8.15

8.33

8.18

8.00

6.42

4.85

3.46

3.35

3.55

3.76

3.26

2.57

3.67

4.36

5.13

5.19

5.20

8.57

8.50

8.25

7.99

6.81

6.26

6.17

5.85

5.59

4.55

4.95

5.40

5.77

6.08

7.05

7.61

7.88

8.05

8.11

8.13

7.77

7.30

6.28

5.14

""""""""""""75.2"'" """

75.9

76.0

76.1

75.9

76.1

74.7

68.0

64.6

107.6

109.6

107.1

104.3

83.1

61.9

42.7

40.0

41.8

43.9

37.9

29.3

40.3

46.5

52.3

51.4

51.0

112.2

110.9

107.5

103.9

87.8

80.4

79.1

746

71.0

54.9

58.2

65.8

66.6

72.8

75.4

76.4

76.9

76.9

76.9

73.2

68.3

57.9

| 464

159
P13

P13

P13

pi 3

P13

P13

P13

P13

PI 3

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

...............__..,... ...,.^

2.3 i

4.7 |

6.7

8.5

10.6

12.8

14.4

16.5

18.6

20.7

22.4

24.4

26.4

28.7

31.2

35.8

40.6

45.7

50.5

55.3

60.8

65.4

71.8

75.3

80.3

1.6

3.5

5.5

7.3

9.6

11.5

13.5

15.6

17.3

19.4

22.4

26.4

30.8

35.4

40.5

45.3

50.8

57.2

27.79 :

26.02

25.80

25.57

25.48

2528

25.23

24.80

22.42

20.08

19.50

19.07

17.49

16.72

15.80

14.74

12.88

11.98

11.29

10.85

10.58

1042 

9.63

9.30

9.08

27.16

25.91

25.65

25.56

25.43

25.39

24.81

24.07

21.82

19.83

18.59

16.21

14.74

12.83

11.98

11.54

11.07

10.86

I 10.86

8.69

8.72

8.69

8.65 \

8.57

8.42

8.39

8.26

7.79

7.74

7.73

7.74

7.76

7.78

7.81

7.85

8.01

8.07

8.09

8.09

8.07

8.03

8.00

7.85

7.79

7.78

8.77

8.69

8.50

8.37

8.37

8.33

8.13

8.04

7.87

7.75

7.78

7.80

7.81

7.90

7.95

7.91

7.85

7.77

7.74

503 \

507

511 ]

511

516

516

541

514

494

448

445

449

471

482

502

552

697

710

708

716

745

771

786

817

817

814

652

647

655

689

693

717

77^

796

614

450

451

475

535

687

732

753

775

790

791

8.41

8.73

8.56

8.17

7.50

6.40

6.21

5.32

4.16

5.11

5.32

5.47

5.76

5.95

6.38

6.60

7.27

7.78

8.02

8.03

7.90

7.65

7.27

6.40

5.10

5.00

10.97

9.72

7.48

6.54

6.48

6.09

4.54

3.90

4.13

5.08

5.75

6.20

6.46

_ *zz__ 7.02

6.56

5.81

: 4.74

! 4.48

113.3

113.8

111.1

105.6

96.8

82.3

79.8

67.8

50.8

59.5

61.3

62.4

63.6

64.7

68.1

68.8

72.8

76.3

77.5

76.8

75.1

72.5

68.6

59.5

47.0

45.9

1460

126.6

96.9

84.7

83.6

78.6

57.9

49.1

49.7

58.9

65.0

66.7

67.4

67.8

68.9

63.8

; 55.8

453

! 42.9

160
Table e. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for 

November 1996.

Station Depth Temperature pH Conductance 

____(m) (Centigrade)_________(us/cm)

Dissolved Oxygen 

(mg/L)

P1 !

P1

___

P1

P1

P1

P1

P1

P1

P1

P1

P1p=j

pi

P1p-j

pi

P1

P1

P1

P1

P1

P1

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

0.4

2.1

4.1 _

7.9

10.1

11.8

13.9

16.9

20.0

23.0

26.0

30.1

35.0

40.0

44.6

50.4

55.5

60.2

654

70.2

79.9

90.3

96.7

0.3

22

3.9

6.4

8.3

10.2

12.3

14.0

16.3

17.7

20.6

21.9

24.3

25.9

27.9

30.3

35.6

40.2

; 45.4

16.71

16.44

16.38 ___ _

16.34

16.34

16.34

16.34

16.33

16.33

16.33

16.22

16.11

15.98

13.98

13.01

12.17

11.39

10.61

9.75

9.16

8.27

7.93

7.85

16.95

16.85

16.71

16.63

16.57

16.54

16.54

16.53

16.52

16.52

16.52

16.52

16.51

16.50

16.49

16.49

15.52

13.55

I 12.63

8.01

8.01

8.00 _g.^__

8.00

8.00

8.00

8.00

7.99

7.99

7.99

7.96

7.94

7.87

7.61

7.57

7.56

7.57

7.58

7.59

7.58

7.56

7.50

7.46

8.04

8.05

8.05

! 8.05

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.04

7.91

I 7.72

I 7.63

655 ;

659 I

660 I , ____

660

661

661

661

661

661

661

661

662

663

668

675

657

650

643

648

674

742

803

840

652

654

655

653

654

654

654

655

655

656

656

656

657

656

656

657

661

667

664

7.21

7.12

7.09 __

7.06

7.05

7.04

7.03

7.03

7.03

7.01

6.84

6.68

6.29

4.72

4.56

5.35

5.70

6.08

6.44

6.51

6.47

5.95

5.42

7.54

7.49

7.44

7.43

7.40

7.39

7.36

7.35

7.33

7.32

7.33

7.34

7.35

7.34

7.33

7.32

7.19

6.07

i 4.99

161
P2 J 50.5 j 11.71

P2 ! 55.1 ! 10.86

P2 i 60.1 i 10.21

P2 | 64.8 1 9.68

P2 \ 70.1 i 9.22

P2 ! 74.5 i 8.83

P2 i 80.1 ; 8.46

P2 i 84.6 1 8.19

P2 ! 90.4 i 7.97

P2 j 95.0 1 7.99

P3 l 0.6 I 16.07

P3 I 2.1 I 16.12

P3 ! 2.7 | 16.14

P3 i 3.8 i 16.15

P3 i 5.9 ! 16.15

P3 I 8.1 | 16.15

P3 | 10.0 ! 16.16

P3 i 12.1 | 16.16

P3 i 15.0 i 16.15

P3 i 16.9 i 16.14

P3 j 19.2 | 16.13

P3 i 22.1 i 16.11

P3 ! 24.1 ( 16.11

P3 | 26.2 | 16.09

P3 | 29.0 I 16.05

P3 i 31.0 ; 16.03

P3 | 33.5 | 15.92

P3 1 35.4 j 15.91

P3 i 37.8 j 15.59

P3 1 40.2 ) 13.81

p^ | 428 j 13.14

P3 ! 43.0 \ 13.10

P4 i 0.3 \ 17.10

P4 I 2.2 j 17.06 P4 I 4^ j ^Q_Q3

P4 i 5.9 i 16.76

P4 | 8.4 I 16.74

P4 10.0 j 16.71

P4 12.1 I 16.71

P4 14.1 16.69

P4 16.4 16.68

P4 18.1 16.68

P4 20.0 16.66

P4 22.0 16.66

P4 24.3 16.66

P4 26.1 16.66

P4 I 28.3 16.64

P4 ! 30.1 16.65

P4 | 35.1 14.87

P4 i 40.1 13.28

7.61 I

7.61

7.61 i

7.62

7.61

7.59

7.55

7.52

7.51

7.46

8.04

8.04

8.04

8.04

8.04

8.04

8.03

8.03

8.03

8.03

8.03

8.03

8.03

8.03

8.04

8.05

8.04

8.04

7.95

7.56

7.50

7.48

7.95

7.95

7.96

7.96

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.94

7.94

7.94

7.65

7.62

645 I

637

629

634

657

696

741

773

794

826

640

642

643

642

643

643

643

644

644

544

645

645

646

646

646

646

647

647

650

671

678

679

609

610

610

611

611

612

611

611

611

610

610

611

611

611

611

611

643

1 647

5.86

6.24

6.49

6.71

6.79

6.67

6.21

5.94

5.96

5.20

7.38

7.32

7.30

7.29

7.29

7.28

7.28

7.27

7.27

7.29

7.30

7.30

7.32

7.33

7.40

7.45

7.43

7.44

6.51

2.72

2.37

2.30

7.09

7.07

7.06

7.08

7.07

7.06

7.05

7.05

7.06

7.06

7.06

7.04

7.04

7.03

7.02

7.00

5.21

! 5.32

162
 . , .,.... ... . r.^_.^............,^..,...........^.._.........

P4 | 50.2 | 11.50

P4 i 54.9 | 10.80

P4 i 61.0 10.24

R4 j 652 973

P4 | 70.1 9.25

P4 | 7gQ g71

P4 | 80.2 8.38

P4 J 85.3 8.10

P4 i 91.3 7.85

P4 | gg^ 7 g;j

P5 i 6.7 15.51

P5 ! 1.8 15.52

P5 I 4.4 15.54

P5 1 7.3 15.56

P5 ! 8.5 15.55

P5 i 10.3 15.55

P5 i 13.6 i 15.54

P5 i 14.1 j 15.55

P5 I 17.0 \ 15.54

P5 i 18.3 ! 15.54

P5 j 20.3 | 15.54

P5 i 22.5 ) 15.54

P5 j 24.2 j 15.54

P5 i 26.2 I 15.54

P5 | 28.7 1 15.54

R5 | 3Qg j 1554

P5 ! 35.3 i 15.53

P5 | 40.7 | 13.27

P5 \ 46.1 I 12.34

P5 i 50.6 [ 11.41

P5 i 55.3 | 10.60

P5 | 60.4 I 10.11

P5 I 64.8 i 9.81

P5 i 70.2 i 9.55

P5 1 75.7 i 9.19

P5 | 80.2 [ 8.77

P5 I 85.1 I 8.42

P5 j 89.9 1 8.07

P5 i 95.5 | 7.81

P6 ) 0.4 s 16.87

P6 j 2.1 ! 16.87

j5g | 42 I 16.73

P6 | 6.4 16.69

P6 1 8.2 ; 16.68

P6 1 10.4 S 16.66

P6 11.4 1 16.63

P6 1 14.9 i 16.63

P6 l 17.2 ! 16.63

P6 18.5 i 16.62

7.60

7.60

7.61

7.60

7.61

7.60

7.58

7.56

7.53

7.49

7.44

7.96

7.96

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.95

7.74

7.70

7.68

7.68

7.66

7.65

7.64

7.64

7.62

7.60

7.58

7.54

7.88

7.86

7.85

7.85

7.84

7.84

7.84

7.83

7.83

7.83

644 1

642

631

630

630

657

700

731

763 i

810

844

545

545

546

547

546

548

549

549

548

549

548

549

549

549

549

549

550

620

622

615

598

603

612

638

689

722

743

767

798

559

560

562

561

561

561

560

560

560

i 560

5.68

5.97

6.26

6.40

6.68

6.73

6.66

6.54

6.34

5.93

4.89

7.48

7.45

7.46

7.44

7.44

7.43

7.42

7.42

7.40

7.39

7.39

7.38

7.38

7.38

7.38

7.39

7.39

7.10

6.38

6.57

6.69

6.87

6.89

6.94

7.02

7.04

6.85

6.70

6.53

6.72

6.61

6.58

6.55

6.53

6.51

6.49

6.48

6.48

6.49

163
P6

P6

P6

P6

P6

P6

P6

P6

P6

pg

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P8

P8

P8

P8

P8

P8

P8

P8

20.4 !

21.9 ;

24.3

26.6 [

27.6 I

30-4

35.2

40.0

40.1

44.8

49.9

55.4

60.6

65.5

70.1

75.1

80.5

85.4

90.3

95.7

0.2

2.1

4.5

6.3

8.4

10.4

12.2

14.9

17.8

18.3

20.3

22.4

24.7

27.1

28.7

31.5

35.4

40.2

46.0

51.0

55.4

60.4

0.2

2.3

4.3

6.0

8.8

11.2

12.2

! 14.5

16.61

16.61

16.61

16.61

16.61

16.56

14.78

12.99

13.00

11.76

10.80

10.14

9.67

9.36

9.05

8.75

8.31

8.08

7.94

7.76

16.74

16.74

16.58

16.56

16.56

16.54

16.53

16.53

16.53

16.53

16.52

16.52

16.51

16.50

16.48

16.30

15.58

13.53

11.83

10.86

10.51

9.97

16.40

16.40

16.39

16.39

16.39

16.37

16.37

16.38

7.83 \

7.83

7.83

7.83 ;

7.83 i

7.83 i

7.63 j

7.59 i

7.60 I

7.59 )

7.57 |

7.55 !

7.52 |

7.49 \

747 i

7.45 i

7.40 l

7.36 <

7.35 i

7.34

7.97 !

7.96 ;

7.95

7.95

7.93

7.93

7.92

7.92

7.92

7.92

7.92

7.92

7.92

792

7.92

7.90

7.83

7.55

7.51

7.44

7.40

7.35

7.98

7.97

7.97

7.97

7.96

7.97

7.96

7.96

559

560

560

560

560

559

563

549

548

540

531

529

539

554

580

613

687

739

775

816

576

578

578

579

579

579

579

579

579

579

579

579

579

579

579

583

603

596

558

557

556

556

601

602

603

603

603

603

603

603

6.49

6.50

6.49

6.49

6.47

6.47

5.41

5.94

5.85

6.24

6.46

6.38

6.28

5.84

5.69

5.30

4.93

4.17

3.99

4.21

7.44

7.43

7.38

7.32

7.22

7.17

7.15

7.14

7.13

7.14

7.15

7.14

7.13

7.14

7.14

7.22

6.69

4.15

4.19

3.50

3.12

2.85

7.23

7.21

7.17

7.15

7.13

7.13

7.12

i 7.12

164
P8

P8

P8

P8

P8

P8

P8

P8

pg

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

17.1 ;

18.3

20.9

22.2

24.1

26.5

28.5

31.0

31.4

0.4

2.2

4.2

8.0

9.8

12.9

14.8

16.9

18.9

21.0

22.2

24.7

2gg

27.4

30.9

32.8

35.1

41.1

45.3

50.8

55.3

59.8

65.0

0.3

2.5

4.5

6.3

8.6

10.2

12.1

14.2

16.2

18.4

19.8

22.6

24.9

26.7

28.5

30.7

35.1

40.4

16.38 ;

16.38 I

16.36 \

16.34

16.18

15.20

13.79

13.39

13.37

16.90

16.89

16.67

16.64

16.62

16.60

16.60

16.61

16.60

16.60

16.59

16.59

16.43

16.17

15.65

15.31

14.37

^2jg

11.87

11.17

10.54

10.22

10.14

16.45

16.51

16.51

16.50

16.50

16.50

16.51

16.49

16.50

16.49

16.46

16.44

16.44

16.30

16.05

15.11

13.92

12.52

7.96 I

7.96 i

7.96

7.96

7.96

7.99

7.98

7.98

7.98

7.84

7.84

7.83

7.83

7.82

7.81

7.81

7.81

7.81

7.81

7.81

7.81

7.74

7.61

7.49

7.46

7.51

7.53

7.44

7.43

7.46

7.47

7.46

7.89

7.87

7.87

7.86

7.85

7.85

7.85

7.85

7.84

7.84

7.84

7.84

7.83

7.83

7.80

7.68

7.65

7.67

603 I

603

604

604

603

606

621

623

623

572

572

576

576

576

574

575

576

575

577

580

581

600

615

618

615

603

612

631

631

626

627

629

512

516

515

515

515

514

515

515

515

515

515

517

517

518

529

571

599

j 621

7.12

7.12

7.12

7.11

7.13

7.34

7.53

7.59

7.75

6.49

6.49

6.38

6.31

6.28

6.28

6.28

6.27

6.25

6.24

6.21

6.18

6.15

3.98

3.40

3.05

3.63

5.13

4.25

2.98

3.34

4.57

4.74

7.03

7.02

7.00

6.98

6.96

6.95

6.96

6.96

6.95

6.95

6.96

6.94

6.93

6.95

6.86

6.50

5.79

6.20

165
P10

P10

P10 

P10

P10

P10

P10

P10

P10

P10

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

50.6 ! 11.21

56.2 \ 10.73

59.9 i 10.41 

65:0 I lo:i4

71.1 i 9.89

76.6 \ 9.57

79.6 S 9.31

85.0 | 8.95

90.6 1 8.43

95.5 ! 8.11

6.2 i 15.93

1.9 i 15.93

3.9 | 15.84

6.3 f 15.82

9.2 i 15.81

9.4 i 15.81

12.9 i 15.77

15.2 I 15.75

16.2 I 15.75

17.7 I 15.74

17.9 I 15.72

20.7 i 15.70

22.4 ! 15.70

25.2 ; 15.65

26.1 I 15.63

29.1 l 15.58

3^2 ( 1541

33.2 I 15.18

35.0 1 13.86

37.0 1 13.28

37.7 i 13.06

0.3 I 16.26

2.3 ! 16.13

39 | 1612

i 6.3 I 16.10

: 8.1 i 16.10

] 10.4 i 16.11

i 11.8 ! 16.11

i 14.3 I 16.10

I 16.1 I 16.10

I 18.4 [ 16.10

I 20.3 i 16.11

i 22.3 i 16.10

I 24.3 ! 16.11

; 26.6 I 16.10

| 28.1 | 16.09

i 30.5 i 16.09

i 31.9 i 16.02

1 34.1 i 15.75

j 36.6 I 14.50

7.67

7.68

7.69 

7:68

7.67

7.64

7.61

7.59

7.55

7.51

7.95

7.94

7.93

7.91

7.91

7.91

7.90

7.90

7.90

7.90

7.90

7.90

7.91

7.91

7.92

7.93

7.94

7.79

7.60

7.55

7.95

7.94

7.94

7.93

7.93

7.93

7.93

7.93

7.93

7.92

7.92

7.92

7.92

7.92

7.92

7.92

7.91

7.87

7.77

641

656

669 

685

704

732

749

766

789

810

567

568

568

568

568

568

567

567

567

567

567

566

565

564

564

563

560

561 __

659

665

679

680

681

683

682

682

683

684

685

684

685

685

685

685

685

687

694

701

740

6.70

6.76

6.91 " g;gg~- ----

7.00

6.92

6.52

6.29

5.97

5.48

7.54

7.57

7.57

7.48

7.43

7.46

7.42

7.42

7.39

7.41

7.39

7.39

7.40

7.44

7.45

7.50

7.55

7.69

7.98

6.33

3.80

7.30

7.27

7.22

7.20

7.18

7.17

7.17

7.17

7.18

7.18

7.18

7.18

7.17

7.17

7.17

7.16

7.09

6.79

6.45

166
P12 p 12

P12

p-,2

P12

P12

P12

P12

P12

P12

P12

P12

P13

13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P14

P14

P14

P14

P14

P14

P14

P14

38.2

39.9

45.6

50.6

55.1

60.2

65.7

69.9

75.5

79.9

85.4

87.6

0.4

2.0 i

4.2 i

6.4

8.1

10.6

13.1

13.6

16.3

184

20.6

22 i

23.9

26.2

27.8

30.2

32.8

33.5

3g_2

38.5

40.5

44.8

49.8

55.5

59.8

65.1

70.6

74.9

79.7

80.9

0.3

2.1

4.5

6.6

I 8.4

I 10.7

I 12.7

i 14.1

13.83 I

13.16 :

12.43

11.97

11.56

11.20

10.65

10.22

9.89

9.49

9.22

9.16

16.22

16.16

16.08

16.05

16.05

16.05

16.05

16.05

16.06

16.06

16.05

16.07

16.08

16.10

16.10

16.10

15.85

15.31

14.62

14.05

13.58

12.59

11.91

11.77

12.05

11.54

10.45

10.14

10.04

: 10.01

15.86

15.87

15.89

15.87

15.87

15.85

15.79

15.79

7.70 I

7.64 ;

7.60 !

7.56

7.52

7.50

7.48

7.45

7.44

7.43

7.40

7.38

7.89

7.90

7.89

7.89

7.89

7.89

7.89

7.89

7.90

7.90

7.90

7.90

7.91

7.91

7.91

7.92

7.87

7.79

7.75

7.70

7.67

7.60

7.54

7.54

7.65

7.57

7.44

7.42

7.37

7.36

8.01

8.01

8.01

8.01

8.01

8.01

! 8.00

I 8.00

717 !

746

735 !

749

749

736

747

756

758

763

766

766

718

719

721

725

727

730

731

732

733

734

733

735

742

744

746

748

756

754

785

784

111

766

772

806

888

846

759

765

766

767

802

804

805

806

805

808

812

I 811

5.66

5.09

4.93

4.72

4.22

4.19

4.22

3.98

3.97

3.93

3.76

3.18

7.24

7.23

7.20

7.15

7.13

7.13

7.13

7.14

7.15

7.15

7.15

7.16

7.17

7 Jg

7.20

7.20

7.18

6.23

6.15

564

5.42

5.09

4.60

4.68

5.47

4.84

! 3.68

3.48

3.00

2.66

7.56

7.60

7.62

7.61

7.59

7.55

7.51

7.45

167
P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

17.2

18.8

20.6

22.0

24.8

27.0

28.0

30.3

36.3

40.0

45.6

49.2

55.9

59.0

15.79

15.79

15.79

15.79

15.79

15.79

15.75

15.71

15.19

14.89

13.75 ., 

11.35

11.27

8.00

8.00

8.00

8.00

8.00

8.00

8.00

8.00

8.01

Q02

g02

8.02

8.02

8.01

814

814

817

821

823

823

826

841

866

874

902

926

959

962

7.45

7.44

7.44

7.43

7.43

7.42

7.43

74^

7.40

7.45

111

8.00

8.17

8.53

168
Table f. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for January 

1997.

Station Depth Temperature pH Conductance Dissolved Oxygen Dissolved Oxygen 

_______(m) (Centigrade)________(us/cm)_____(mg/L)_____(%satu ration)

P1

P1

pi

PI

PI

PI

PI

PI

PI

PI

pi

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

0.3

1.0 _____.

3.4

4.7

6.3

6.6

6.9

8.8

10.4

12.4

16.4

19.1

21.5

25.5

30.3

35.9

41.0

45.2

50.7

57.2

60.9

66.2

70.6

75.3

80.4

85.5

90.4

95.5

0.3

0.6

2.4

3.7

4.2

6.3

7.1

8.5

10.9

12.8

15.2

16.8

^ 7

\ 20.8

l 21.0

9.53

9.50

9.46

944

9.43

9.43

9.43

9.42

9.41

9.41

9.46

9.39

9.41

941

9.39

9.39

9.40

9.40

9.38

9.38

9.33

9.32

9.26

8.54

8.04

7.94

7.88

7.93

7.94

10.34

10.20

9.90

9.70

! 9.71

9.67

9.64

9.63

9.62

gg2

9.62

9.62

9.62

9.62

8.06 !

8.06 i

8.07

8.05

8.05

8.05

8.05

8.05

8.05

8.05

8.05

8.05

8.05

8.05

8.05

8.04

8.04

8.04

8.05

8.05

8.06

8.06

8.05

7.85 ..... __..._._ ..

7.71

7.68

7.63

7.59

8.03

8.03

8.02

8.03

8.02

8.03

8.02

8.02

8.02

8.02

8.02

8.01

gQ2

8.01

I 8.02

649 i

650 |

650

652

651

651

652

652

652

652

652

653

653

653

653

654

654

654

653

653

651

651

652

731

778

790

802

825

848

647

647

649

649

649

650

649

648

648

648

648

649

649

650

650

8.43

8.42

8.44

8.44

8.44

8.43

8.43

8.41

8.40

8.40

8.39

8.36

8.36

8.36

8.36

8.34

8.31

8.30

8.31

8.31

8.32

8.38

8.40

8.34

6.53

5.72

5.59

5.20

4.67

8.21

8.19

8.25

8.17

8.22

8.16

8.16

8.16

8.15

8.13

8.13

8.11

8.10

8.09

8.10

80.4

80.3

80.4

80.3

80.3

80.2

80.1

80.0

79.9

79.9

79.7

79.5

79.5

79.5

79.5

79.3

79.0

78.9

79.0

79.0

79.0

79.5

79.6

77.7

60.1

52.6

51.2

47.7

42.9

79.8

79.3

79.4

78.3

78.7

78.0

78.0

78.0

77.9

77.7

...-.____..__

77.5

77.4

77.4

77.4

169
P2

P2

P2

P2 ;

P2

P2

P2P2

P2

P2

P2

P2

P2

P2

P2

P2 ..............................

P2

P2

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P3

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

23.1 I

24.7

27.4

29.6

31.4

34.6

40.8

45.1

52.0

55.2

60.8

66.4

70.4 i

75.1 I

80.6 i

85.5 : ........ __ 

95.2

97.3

0.3

2.7

44

6.3

7.5

8.1

10.9

13.7

15.2

:jg_2

19.2

2^2

25.2

30.5

36.1

0.5

5.6

10.1

15.0

20.1

25.1

30.6

34.9

40.2

45.0

49.9

55.6

59.7

70.7

I 75.2

i 81.4

9.62 i

9.62

9.62

9.62

9.63

9.63

9.63

9.61

9.57

9.54

9.24

8.93

8.52

8.28

8.05

7.89 

7.82

7.80

7.80

10.28

9.85

9.67

9.61

9.60

9.59

9.55

9.51

9.50

9.50

9.50

9.50

9.49

9.47

9.48

10.64

9.85

9.78

9.77

9.75

9.75

9.74

9.72

9.62

9.59

9.49

9.47

9.55

9.12

8.77

8.62

8.02

8.02

8.02

8.02

8.02

8.02

8.02

8.02

8.01

8.02

7.91

7.76

7.72

7.70

7.67

7.65 

7 62

7.60

7.58

8.20

8.20

8.20

8.20

8.20

8.20

8.19

8.18

8.17

8.18

8.17

8.17

8.18

8.18

8.16

8.14

8.15

8.15

8.14

8.13

8.13

8.12

8.12

8.11

8.09

8.06

7.94

7.81

7.81

I 7.76

I 7.75

650

651

651

651

652

652

653

651

653

656

686

735

751

764

783

806 

828

848

855

639

641

641

641

640

641

641

642

642

642

642

642

642

643

644

636

641

641

642

642

641

641

641

646

653

666

706

gQ2

840

820

836

8.10 ;

8.09

8.08 )

8.08 !

8.08 i

8.08 j

8.07 I

8.06 i

8.05

8.03 f

7.66 !

7.15 :

5.79

5.64

5.50

5.34 

5.03

4.81

4.50

8.35

8.40

8.36

8.34

g_2g

8.32

8.29 g 2g

8.25

8.21

8.17

8.16

8.19

8.19

8.21

7.78

7.84

7.86

7.82

7.77

7.73

7.69

7.68

7.58

7.42

7.20

6.30

491

5.12

4.77

476

77.4

77.3

77.3

77.2

77.3

77.3

77.2

77.0

76.8

76.6

72.5

67.3

53.9

52.3

50.6

49.0 .... __....

44.0

41.2

81.0

80.7

79.9

79.7

79.2

79.4

79.1

79.0

78.7

78.2

77.9

77.7

78.0

78.0

78.2

76.1

75.3

75.4

75.0

74.5

74.1

73.7

73.5

72.5

70.8

68.6

60.0

46.9

48.4

44.7

44.4

170
P4

P4

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

89.2 ;

98.4

0.2

1.8

4.1

7.1

9.0

11.2

13.3

15.1

17.2

19.6

21.3

26.0

30.5

40.2

45.5

52.2

55.5

61.7

66.1

70.2

77.8

82.8

87.4

90.5

96.7

0.3

2.8

4.8

5.7

8.6

10.5

12.4

14.6

17.6

20.0

21.3

22.9

25.2

27.4

29.0

29.3

35.9

40.9

48.2

52.3

56.9

60.9

65.8

8.11

7.84

9.40

9.37

9.30

9.29

9.29

9.29

9.28

9.29

g_2g

9.28

9.28

9.27

9.25

9.24

9.24

9.21

9.19

8.92

8.87

8.70

8.52

8.32

8.16

8.08

7.99

10.29

9.45

9.32

9.28

9.26

9.25

9.24

9.24

9.23

9.22

9.21

9.19

9.18

9.17

9.15

9.14

9.18

9.19

9.16

9.04

8.76

8.58

8.56

7.72

7.64

8.21

8.21

8.21

8.20

8.20

Q20

8.20

8.20

8.20

8.20

8.19

8.19

8.19

8.18

8.18

8.18

8.17

8.03

8.05

8.08

8.08

8.08

8.09

8.11

8.12

8.07

8.07

8.06

8.05

8.05

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.04

8.05

8.07

8.07

8.06

7.99

7.97

7.87

) 7.75

819

857

633

635

635

636

636

636

637

637

637

637

638

638

638

639

639

639

640

744

807

822

826

824

823

822

821

599

600

602

601

601

601

601

603

602

603

604

606

608

612

616

618

633

636

637

640

659

683

750

4.65 !

3.63 i

8.26

8.24

8.24

8.23

8.21 8 2Q

8.20

8.19

8.19

8.19

8.18

8.16

8.15

8.11

8.10

8.08

8.07

7.92

7.12

6.96

7.09

7.14

7.20

7.33

7.50

7.96

8.03

7.98

7.86

7.83

7.83

7.81

7.80

7.80

7.80

7.81

7.80

7.79

7.79

7.79

7.90

7.90

7.93

7.96

7.93

7.45

7.12

6.39

42.9

33.3

78.5

78.3

78.2

78.0

77.9

77.7

77.8

77.7

77.7

77.6

77.5

77.3

77.2

76.9

76.7

76.5

76.3

74.5

66.8

65.1

66.1

66.2

66.5

67.6

69.0

77.2

76.4

75.7

74.5

74.2

74.2

74.0

73.9

73.9

73.9

73.9

73.8

73.7

73.6

73.6

74.7

74.7

75.0

75.3

74.7

69.8

66.4

59.6

171
P6

P6 !

P6 j

P6 i

P6

P6

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7 P7~" '

P7

P7

P7

P7

P7 ..,......__ ..............

P7

P7

P7

P7

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P9

P9

P9

P9

P9

70.4

76.5

81.2

86.4

91.4

95.7

6.4

2.5

3.3

6.7

8.5

11.1

12.6

14.7

16.9

19.2

20.9

23.2

25.0

27.1

29.0

31.0

35.8

40.8 ., ....,.___ ,..,..

50.4

55.4

57.7

60.0

0.3

2.4 £5 

5.5

8.2

10.3

12.8

14.0

17.0

18.8

20.9

23.1

25.1

27.0

28.2

29.4

0.3

3.1

3.7

6.5

! 8.4

8.77 |

8.72

847

8.22

8.10

8.00

10.04

9.39

9.32

9.26

9.25

9.24

9.24

9.23

9.22

9.22

9.21

9.21

9.21

9.21

9.21

9.21

9.21

871 8739 

7.87

7.69

7.64

7.59

9.07

8.96

8.90

8.88

8.85

8.83

8.80

8.78

8.70

8.51

8.12

7.75

7.02

6.32

6.09

5.66

10.08

9.82

9.90

9.65

9.60

7.81 I

7.93

7.96

8.03

8.03

8.03

8.16

8.16

8.16

8.15

8.15

8.14

8.14

8.14

8.14

8.13

8.13

8.13

8.13

8.13

8.13

8.13

8.13

8.13 ..

8.13

8.13

8.12

8.13

8.22

8.21

8.21

8.21

8.21

8.21

8.21

8.21

8.21

8.21

8.20

8.20

8.18

8.16

8.16

8.14

7.90

7.91

7.90

i 7.91

i 7.91

829 |

844 I

836

823

823

823

598

599

599

601

601

601

601

601

601

601

601

601

602

602

602

602

602

613 

620

633

638

639

642

602

603

604

604

605

605

605

605

605

610

618

627

661

696

708

735

640

642

643

644

643

5.41

5.61

6.30

6.76

7.36

7.50

8.48

8.45

8.43

8.42

8.38

8.36

8.34

8.34

8.32

8.30

8.29

8.28

8.26

8.26

8.25

8.25

8.24

8.31 " " g;24 "" -

8.34

8.37

8.36

8.36

8.60

8.63

8.61

8.60

8.60

8.61

8.61

8.60

8.60

8.64

8.70

882

8.87

8.99

8.98

9.13

6.80

6.68

6.79

6.69

6.67

50.7

52.5

58.7

62.5

67.9

69.0

81.9

80.3

79.9

79.7

79.4

79.2

79.0

78.9

78.7

78.6

78.5

78.3

78.2

78.2

78.1

78.0

78.0

77.7 - "" yg;"g-~- - 

76.4

76.4

76.1

76.1

81.1

81.2

80.8

80.7

80.7

80.7

80.6

80.5

80.4

80.4

80.2

80.5

79.6

79.3

78.7

79.2

65.7

64.2

65.3

63.9

! 63.7

172
~ pQ 

P9

pg

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P10

PIC

PI 6

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10 _.__,,.,

P10

P10

pid

P10

PH

PH

pn

PH

PH

""9.9"""""";

9.9 i

12.1

14.7

17.0

18.5

20.4

25.9

30.5

34.9

40.5

46.7

50.9

56.8

61.0

66.3

66.9

0.5

2.9

5.6

7.7

8.8

11.6

13.6

15.5

17.8

21.0

23.2

25.3

27.6

29.0

30.6

36.3

41.8

46.4

50.4

57.1

60.4

65.9

70.7 """"""75.5"""""""

81.5

86.7 .........,__......,,

95.0

0.4

2.0

3.8

6.3

8.7

9:57 "I

9.57 I

9.57 I

9.56 I

9.55 i

9.55

9.55

9.53

9.55

9.50

9.79

10.23

10.23

10.11

9.72

9.28

9.25

9.44

9.45

9.46

9.46

9.46

9.45

9.45

9.46

9.46

946

9.45

9.42

9.41

9.41

g.41

9.40

9.67

9.21

9.04

8.65

8.59

8.09

7.73 ......., .... __............

7.32

7.27 """"""""""7;26"""""""'"""""'

7.24

9.61

9.08

8.98

8.95

8.92

7M :

7.90 i

7.90

7.91

7.91

7.91

7.91

7.93

7.98

7.99

7j2

7.84

7.78

7.89

7.86

7.80

7.80

8.14

8.14

8.14

8.14

8.14

8.14

8.14

8.14

8.14

8.14

8.14

8.13

8.13

8.12

8.12

8.12

8.10

8.15

8.16

8.18

8.19

8.18

8.19 

320

8.20

Q2Q

8.20

8.20

8.18

8.17

8.17

8.17

! 8.16

642 1

642

642

644

644

645

645

645

664

665

710

793

812

847

852

846

847

646

646

647

648

647

648

648

648

648

648

648

646

645

645

645

644

704

699

695

688

696

784

801 """""""""807"""""""""

807

807 

807

808

630

632

632

632

633

6.62

6.65 I

6.57

6.56

6.63

6.66

6.67

6.69

7.14

7.26

6.96

6.61

5.86

5.05

5.85

5.52

5.36

7.81

7.82

7.80

7.79

7.79

7.79

7.78

' 7.79

7.79

7.78

7.76

7.75

7.70

7.68

7.67

7.66

7.57

7.52

7.73

7.83

7.95

8.07

8.16 """""""""""""""""8.24"""""""""""""""""

8.33

8.34 """""""""""""""8:34"""""""""""""""""

8.34

8.54

8.47

8.41

8.40

8.40

63.2

63.5

62.7

62.6

63.2

63.5

63.6

63.8

68.1

69.2

66.8

64.1

56.9

48.9

56.0

52.3

50.8

74.3

74.4

74.3

74.2

74.2

74.2

74.1

74.2

74.2

74.1

73.9

73.7

73.2

73.1

72.9

72.8

72.5

71.2

72.9

73.2

74.1

74.4

74.5 """""""""'""""'""""'"'"74:7"""""'""'""""""""""""

75.4

754 '"""""""""""""75:3""""""""""""

75.3

81.6

79.9

79.2

I 79.1

I 79.0

173
PIT

P11

P11

P11

P11

pii

PH

PH

PH

PH

P12

P12

P12

p^2

P12

P12

P12

P12

Pi2

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

las

12.5

15.2

17.3

19.6

2Qg

26.7

31.0

36.0

37.3

0.2

2.2

4.5

6.6

9.1

10.7

14.3

14.4

16.9

19.3

21.0

25.6

31.6

35.2

41.4

46.3

50.9

56.3

60.1

65.5

71.9

76.9

80.7

85.6

0.4

2.5

4.7

8.0

9.5

10.4

13.8

14.8

18.1

19.6

21.3

26.1

30.7

36.6

40.8

! 47.6

8.92 1

8.90

8.90

8.89

8.89

8.88

8.87

8.81

8.56

9.70

9.20

9.02

9.00

8.94

8.92

8.90

8.90

8.89

8.89

8.89

8.89

8.86

8.83

8.70

8.52

8.01

7.33

6.72

6.11

5.97

5.92

5.88

5.90

10.04

9.20

9.06

9.01

8.99

8.98

8.95

8.95

8.94

8.93

! 8.93

8.93

8.88

8.58

8.10

6.93

81 6 !

8.16 I

8.16

8.16

8.15

8.15

8.15

8.16

8.15

8.15

8.18

8.18

8.18

8.18

8.17

8.17

8.17

8.17

8.16

8.16

8.16

8.16

8.16

8.15

8.16

8.18

8.19

8.19

8.19

8.19

8.19

8.18

8.18

8.17

8.19

8.19

8.19

8.19

8.19

8.19

8.18

8.18

8.18

8.18

8.18

8.18

8.18

8.19

8.19

8.20

633 1

633 ;

633

632

632

632

633

632

630

629

641

644

644

644

643

644

645

645

645

646

646

647

656

657

673

689

713

742

767

791

796

798

799

799

654

653

656

657

657

658

657

657

658

657

658

658

664

688

712

756

"""""""""""""""""" "8. 39 " - 

8.38 i

8.36 !

8.37

8.35

8.32 [

8.32 \

8.35 I

8.34 !

8.25

8.33

8.40

8.38

8.38

8.37

8.33

8.30

8.29

8.26

8.25

8.25

8.24

8.24

8.16

8.17

8.21

8.40

8.53

8.61

874

8.81

8.83

8.81

8.80

8.39

8.45

8.41

8.41

8.40

8.39

8.40

8.38

8.38

8.37

8.36

8.35

8.34

8.33

8.42

I 8.63

__,..... ....,.. ...

78.8

78.6

78.6

78.4

78.2

78.1

78.3

77.8

76.9

79.7

79.5

79.0

78.9

78.7

78.3

78.0

77.8

77.6

77.5

77.5

77.4

77.3

76.5

76.4

76.4

77.2

77.1

76.7

76.7

77.1

77.1

76.9

76.9

81.0

80.0

79.3

79.3

79.1

79.0

79.0

78.8

78.8

78.7

78.6

78.5

i 78.3

77.6

77.6

j 77.3

174
P13

P13

P13

P13

P13

P13

PI 3

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

50.9

56.0

60.0

67.2

71.1

76.3

77.0

0.4

2.3

4.6

7.2

9.3

11.5

13.2

15.3

17.5

19.3

21.2

26.3

31.6

35.9

40.3

45.6

51.8

56.5

6.53

5.98

5.84

5.72

5.61

5.56

5.56

8.90

8.75

8.62

8.59

8.58

8.57

8.56

8.56

8.53

8.50

8.44

7.98

7.58

7.54

7.31

6.82

4.89

4.71

8.20

8.20

8.20

8.19

8.19

8.19

8.18

8.23

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

8.24

773

794

798

804

808

809

810

673

676

676

676

676

677

678

678

679

681

683

707

726

728

739

763

862

870

8.67

8.79

8.91

9.00

8.96

8.93

8.90

8.67

8.67

8.70

8.69

8.68

8.66

8.66

8.65

8.65

8.65

8.67

8.70

8.73

8.74

8.76

8.93

9.26

9.40

 - - --yg;g 

76.9

77.7

78.2

77.6

77.3

77.0

81.4

81.2

81.2

81.0

80.9

80.7

80.7

80.6

80.6

80.5

80.6

79.9

79.4

79.4

79.2

79.8

78.8

79.6

175
Table g. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for May 

1997.

Station Depth Temperature pH Conductance Dissolved Oxygen Dissolved Oxygen 

_______(m) (Centigrade)_________(us/cm)_____(mg/L)_____(%satu ration)

P1 I

P1

PI

P1

P1

PI

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P3

P3

P3

0.4 \

5.2

10.3

15.2

20.5

25.1

30.2

35.4

401

45.4

50.2

55.3

60.1

64.0

70.7

75.5

80.1

85.1

90.2

95.7

99.1

6.3

5.1

10.1

15.1

20.3

25.3

30.1

35.1

40.4

45.2

50.6

60.0

65.1

69.5

74.9

80.1

85.4

90.5

94.6

98.6

0.8

4.9

9.9

18.50

14.93 \

13.56

11.78

10.89

^2g

9.91

9.76

9.61

9.37

9.18

8.93

8.48

7.85

7.61

7.26

7.25

7.21

7.19

7.26

7.26

18.12

15.48

13.47

11.46

10.75

10.10

9.89

9.55

9.31

9.23

9.06

8.43

8.02

7.76

7.47

7.34

7.19

7.08

7.04

7.06

20.38

15.55

13.68

8.60 675

8.65 | 678

8.59 I 679

8.40 I 683

8.24 ! 685

8.11 I 693

8.04 | 698

8.01 I 700

7.99 j 701

7.97 ! 704

7.95 \ 717

7.90 ! 751

7.83 810

7.80 I 842

7.77 I 855

7.82 | 845

7.81 S 848

7.81 | 849

7.80 ! 850

7.76 1 861

7.75 : 864

8.63 ! 676

8.68 ! 678

8.58 | 680

8.33 i 685

8.16 I 687

8.06 I 692

8.01 I 694

7.97 i 697

7.94 j 704

7.93 I 706

7.91 \ 725

7.83 i 793

7.79 i 829

7.80 I 835

7.82 i 838

7.82 ! 837

7.83 i 836

7.83 I 838

782 | 840

7.79 j 846

8.58 I 677

8.63 ; 679

8.50 ! 684

9.62

10.28

10.22

9.78

9.01

8.41

8.03

7.90

7.80

7.77

7.62

7.34

6.67

6.58

6.51

6.68

6.81

6.80

6.74

6.44

6.22

9.88

10.57

10.43

9.52

8.75

8.28

8.02

7.89

7.78

7.76

7.73

6.96

6.77

6.69

6.97

7.06

7.18 

7.13

6.95

9.16

10.35

i 10.18

113.3

112.4

108.4

99.8

90.0

82.8

78.4

76.9

75.6

74.9

73.1

70.1

63.0

61.2

60.2

61.3

62.4

62.3

61.7

59.0

57.0

115.5

117.0

110.4

96.4

87.1

81.2

78.3

76.4

74.9

746

73.9

65.6

63.2

62.6

64.2

64.8

65.7

65.8

65.0

63.4

112.1

114.7

! 108.2

176
P3

P3

pg

P3

P3

P3

P4

P4

P4

P4

P4

P4

.... J*_._

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P6

P6

P6

15.2 i

20.4 I

25.4 i

30.4 i

36.2 :

39.1 !

0.4 i

4.8

10.1

15.1

20.9

25.4

30.0

34.8

40.4

45.1

50.8

55.2

60.3

64.3

69.6

76.1

81.4

90.1

93.7

98.0

6.4

5.5

10.5

15.0

15.1

20.4

24.9

30.2

35.1

40.2

45.1

50.1

54.7

60.2

65.1

70.2

75.1

80.0

85.3

90.0

99.1

0.5

4.5

10.5

11.44 [

10.84

10.36

9.85

9.63

9.45

21.70

15.73

14.30

11.72

10.77

10.10

9.47

9.23

9.10

8.92

8.76

8.64

8.43

8.21

7.87

7.33

7.21

6.92

6.88

6.87

19.53

17.22

14.42

12.03

11.89

10.93

10.37

9.90

9.43

9.11

8.79

8.57

8.28

7.91

7.71

7.42

7.21

6.98

6.78

6.60

6.52

18.72

16.37

14.81

8.27

8.12 ;

7.99 I

7.91 i

7.84

7.79

8.61

8.66

8.60

8.35

8.13

8.01

7.94

7.93

7.91

7.92

7.88

7.86

7.81

7.79

7.78

7.80

7.80

7.83

_ 

7Q2

8.58

8.60

8.52

8.32

8.27

8.18

8.11

8.06

8.02

8.01

7.99

8.00

8.01

8.01

8.01

8.01

7.99

7.97

7.96

7.96

7.95

8.48

i 8.51

i 8.48

688

687

697

704

712

723

674

680

679

683

684

687

694

699

707

707

731

745

779

803

828

833

831

830

830

832

670

671

670

671

672

679

681

681

683

683

687

695

706

723

733

750

772

787

797

804

808

652

651

\ 662

9.19

8.42

7.70

7.21

6.81

6.48

9.41

10.53

10.52

9.81

8.73

8.18

7.87

7.87

7.86

7.86

7.72

7.35

7.02

6.85

6.79

704

7.12

7.39

7.44

7.43

9.54

10.04

10.37

9.51

9.25

8.97

8.68

8.48

8.40

8.34

8.34

8.41

8.54

8.63

8.70

8.72

8.60

8.52

8.43

8.51

8.45

8.95

9.53

9.67

92.9

84.1

76.0

70.3

66.1

62.6

118.2

117.2

113.5

99.9

87.0

80.2

76.1

75.6

75.3

75.0

73.4

69.6

66.2

64.3

63.2

64.7

65.1

67.2

67.5

67.4

114.7

115.2

112.1

97.5

94.5

89.7

85.7

82.7

81.1

79.8

79.3

79.6

80.2

80.3

80.6

80.2

78.7

77.6

76.3

I 76.7

I 76.0

i 105.9

} 107.4

] 105.4

177
P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

jpg

P6

P6

P6

P6

P6

P6

P7

P7

P7

P7

P7

P7 ____ .

P7

P7

P7

P7

P7

P7

P8

P8

P8

P8

P8

P8

P8

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

15.4 i

20.2 :

25.1 |

30.1 t

35.1

44.5

50.2

55.9

60.3

65.4

70.3

75.3

80.8

85.5

90.2

95.1

98.7

6.2

4.3

10.7

14.9

20.5

.^^ 25.5

35.6

40.5

45.3

50.8

55.5

58.2

0.2

44

10.2

15.1

20.7

25.3

27.4

0.2

5.3

9.9

15.1

20.2

24.7

29.5

30.3

35.1

40.0

44.7

50.5

55.2

11.84

11.22

10.43

9.64

9.06

8.65

8.48

8.31

8.12

7.87

7.61

7.30

7.07

6.87

6.75

6.70

6.66

18.23

16.92

1534

12.32

11.71

10.86 ^ff -'

9.19

8.90

8.83

8.78

8.65

8.60

20.67

16.93

15.14

12.59 __

11.21

10.84

19.20

15.82

14.53

12.18

11.21

10.53

9.93

9.92

9.14

_______

8.74 

9.01

i 9.08

8.31

8.23

8.14

8.08

8.01

7.98

7.97

7.96

7.95

7.93

7.92

7.92

7.92

7.92

7.92

7.93

7.93

8.52

8.56

8.49

8.07

8.01

^.___ 7.90

7.92

7.91

7.89

7.85

7.76

7.67

8.55

8.64

8.35

8.06

7.96

7.90

7.77

8.47

8.50

8.44

8.30

8.16

8.07

8.66

7.99

7.91

7.83

7.81

7.82

7.73

646

652

661

662

652

660

674

687

708

734

758

781

797

805

808

809

810

653

645

657

672

675

694 g,^_ _.

662

663

672

698

723

732

669

675

662

633

653

689

718

673

674

677

676

679

678

672

673

649

641

678

747

812

9.36 i 95.5

8.96 : 90.1

8.57 \ 84.7

8.31 i 80.6

8.10 i 77.5

8.03 I 76.1

8.00 \ 75.5

7.97 | 74.9

7.93 | 74.2

7.87 i 73.2

7.83 ! 72.4

7.81 ! 71.7

7.77 ! 70.9

7.81 ! 70.9

7.84 ! 71.0

7.90 71.3

7.92 71.5

9.66 113.2

10.05 i 114.5

9.89 I 109.0

8.29 i 85.6

8.18 i 83.3

7.66 | 76.4 ,^,,,^ ___

7.91 ! 75.9

8.01 I 76.3

7.83 | 74.5

7.73 I 73.4

6.93 1 65.7

5.94 1 56.3

9.57 ! 117.8

9.60 I 109.5

8.10 | 89.0

7.72 ; 80.2

7.67 | 77.9

724 i 729

6.29 i 62.8

8.75 ) 104.5

9.62 | 107.2

9.66 ! 104.7

9.37 i 96.4

8.63 1 86.9

8.24 1 81.6

7.93 1 77.4

7.83 1 76.5

752 j 72.1

6.55 1 62.2

6.43 | 61.1

6.46 | 61.8

! 5.28 1 50.6

178
P9 i

P9 :

P9 i ..,.......__.,.........j

P10 ;

P10 I

P10 I

P10

P10

__P10

P10

P10

P10

P10

P10

pio

P10

P10

P10

P1Q

P10

P10

P10

P11

P11

P11

P11

P11

P11

P11

P11

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

60.6 j

65.0 i

66.1 .. , ..__,.... .....,

5.1

10.3

15.1

20.4

25.5

30.9 _____

40.6

45.2

50.4

55.5

60.5 

65:5

70.4

75.0

80.1

85.4

90.4

95.0

97.9

0.8

5.0

10.7

15.0

19.6

24.6

30.2

34.2

6.4

5.4

10.5

15.2

20.4

251

29.6

34.9

40.1

457

50.3

55.4

60.5

654

65.5

69.8

75.9

80.6

9.03

8.95

8.91 

18:65

17.56

15.09

12.13

11.01

10.39

 __ 

9.89 .

QQ2

8.79

8.46

8.17

7.91 

7.72

7.48

7.22

7.06

6.69

6.56

6.49

6.48

18.91

16.24

1425

13.66

13.05

10.31

9.73

9.55

16.62

16.10

14.08

13.50

12.47

10.83

10.39

10.15

9.75

9.35

9.19

8.80

8.41

824

8.26

8.14

7.68

7.43

7.73

7.73

7.72 ! 

8750

8.51

8.47

8.33

8.25

82C)

8.17 _g^__

8.12

8.11

8.09

8.08

8.07 

8.06

8.05

8.04

8.03

7 gg ; 7.97 ;

7.96

7.96

8.47

8.47

8.38

8.33

82g

814

8.09

8.05

8.33

8.31

8.18

8.15

8.13

8.09

8.05

8.02

7.99

7.97

7.96

7.95

7.94

7.92

7.92

7.90

7.88

7.86

846 I

851 I

852

677

678

680

682

685

690

692 _ __

688

689

699

712

728 

741

755

770

779

802

807

812

812

685

682

697

699

688

686

688

690

644

646

653

673

697

717

716

715

715

727

734

748

776

782

782

788

806

814

5.20 :

5.22 !

5.04 .................,.........^__.... ..........,_

9.25

9.39

9.30

9.05

8.92

8.84 __

8.72

8.70

8.70

8.70

8.71 

8.68

8.65

8.62

8.59

8.42

8.32

8.24

8.20

8.91

9.24

9.11

8.93

8.71

8.36

8.23

8.04

8.98

8.93

8.42

8.33

8.41

8.50

8.50

8.44

8.38

8.33

8.25

8.16

8.06

7.88

7.85

j 7.77

! 7.63

i 7- 39

49.7

49.8

48.1 .......... .... __.,._.....,. ..

107.0

103.0

95.5

90.7

88.0

86.3 g^^^^

83.3

82.7

82.0

81.5

81.1 

80.4

79.7

78.8

78.3

76.1

75.0

74.1

73.7

105.9

103.8

98.2

95.0

91.4

82.4

80.0

77.8

101.7

100.1

90.4

88.3

87.1

84.7

84.0

82.9

81.5

80.3

79.2

77.6

75.9

1 74.0

i 73.7

1 72.8

i 70.6

\ 68.0

179
P12 i

p>12

P13

P13

P13

P13

P13

P13

P13

P13 __

P13

P13

P13

Pi" 3

P13 

PI 3

P13

P13

P13

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

85.1 ! 7.25 !

85.3 i 7.25

0.6 | 18.31

4.8 I 15.91

8.9 14.98

10.0 | 14.37

15.2 1 13.56

20.0 | 13.48

24.9 | 12.69

30.6 | 10.42

35.3 | 10.19

39.8 1 9.86

45.1 I 9.58

49.9 ! 9.41

50.2 i 9.38

55.4 I 8.98 " ^- -^ QjQ 

64.8 [ 8.40

70.6 i 8.13

73.6 | 7.92

6.6 ! 15.89

4.8 \ 14.53

10.2 i 14.32

15.1 I 13.88

20.2 ! 13.56

25.2 i 12.96

30.2 i 10.83

35.3 I 10.07

40.4 | g.83

45.6 i 9.65

50.6 | 9.48

55.0 | 9.06

55.6 ! 9.14

7.80 !

7.78 i

8.40 j

8.28

8.19 :

8.14 !

8.07 i

8.09

8.06

8.01

7.98

7.96

7.95

7.94

794

7.91 

7.88

7.85

7.83

7.80

8.16

8.09

8.08

8.06

8.06

8.04

8.00

8.66

7.97

7_94

7.89

7.79

i 7.75

820

821

653

628

613

615

638

665

688

718

715

714

721

729

729

744 

759

782

800

808

544

548

553

566

588

603

705

717

726

733

739

760

753

7.06 :

6.59

9.86

9.25

8.72

8.60

8.34

8.36

8.39

8.50

8.46

8.42

8.46

8.37

8.38

8.22 

7.90

7.67

7.49

7.22

8.82

8.54

8.51

8.45

8.36

8.28

8.37

8.54

8.29

! 7.94

i 7.45

\ 6.36

I 5.86

64.7

60.4

115.8

103.3

95.4

92.9

88.5

88.5

87.3

84.0

83.1

82.1

81.9

80.8

80.8

78.5 75^ 

72.2

70.1

67.2

98.4

92.5

91.8

90.3

88.6

86.7

83.5

83.7

80.7

77.1

72.0

60.9

56.1

180
Table h. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for August 

1997.

Station Depth Temperature pH Conductance Dissolved Oxygen Dissolved Oxygen 

_______(m) (Centigrade)________(us/cm)_____(mg/L)____(%saturation)

P1 \

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

PI

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P1

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

0.0

2.1

4.1

6.0

8.1

10.0

12.1

14.0

15.9

18.0

20.1

25.2

30.0

35.1

40.6

45.1

50.0

55.4

60.1

65.3

70.0

75.3

80.2

85.3

90.2

95.0

97.8

0.2

2.3

4.2

5.7

8.7

10.3

11.7

13.1

14.6

16.2

18.5

21.6

25.5

31.2

36.2

40.9

45.6

26.45

26.08

25.99

25.34

25.16

24.71

22.69

20.82

19.77

18.87

18.26

17.19

15.98

14.68

13.44

12.33

11.76

10.72

10.31

9.32

8.88

8.66

7.60

7.46

7.36

7.30

7.31

27.07

26.47

26.21

25.83

25.18

23.47

21.92

21.05

20.20

19.33

18.56

17.81

16.93

15.98

14.64

) 13.31

12.13

8.37

8.37

8.37

8.36

8.34

8.29

8.12

8.02

7.94

7.79

7.76

7.79

7.82

7.84

7.85

7.76

7.73

7.64

7.62

7.58

7.57

7.53

7.48

7.46

7.46

7.45

7.45

8.36

8.37

8.38

8.37

8.29

7.98

7.78

7.69

__-

7.54

7.52

7.52

7.54

7.63

7.79

7.87

i 7.79

668

670

669

667

666

660

644

641

639

623

624

642

658

673

681

685

686

689

688

704

719

771

808

822

829

837

837

657

658

658

655

651

598

559

545

530

512

511

531

570

612

660

680

i 688

7.37

7.39

7.41

7.51

7.42

7.26

7.15

6.82

6.38

5.77

6.06

6.22

6.62

6.99

7.35

6.95

6.99

6.78

6.74

6.69

6.64

6.53

g2o

6.06

6.04

5.97

5.99

7.33

7.41

7.49

7.45

7.50

6.02

4.98

5.11

4.61

4.30

4.29

4.42

4.76

5.14

5.95

6.84

I 7.45

100.2

99.8

99.9

100.1

98.6

95.7

90.7

83.4

76.4

67.9

70.4

70.7

73.4

75.3

77.1

71.1

70.6

66.9

65.8

63.8

62.7

60.4

56.8

55.3

55.0

54.3

544

100.8

100.8

101.4

100.2

99.6

77.5

62.2

62.7

55.6

51.1

50.2

50.8

53.8

56.9

64.1

71.5

I 75.9

181
P2 1

P2

P2 j

P2 1

P2 I

P2 i

P2 :

P2 j

P3 |

P3 i

P3 ;

P3 !

P3 1

P3

P3

P3

P3

P3

P3

P3

p^

P3

P3

P3

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

51.2 !

59.0 !

62.1

65.8

70.7

80.9

90.5

96.8

0.3

2.1

5.0

7.5

8.4

10.1

12.7

14.0

16.0

18.3

20.8

25.8

30.7

35.6

39.9

41.5

2.4

4.3

6.4

8.2

10.0

12.3

14.3

16.1

18.5

20.7

25.6

30.1

35.5

40.6

45.5

50.3

55.1

60.6

64.9

69.9

75.5

80.3

85.0

89.8

94.9

98.9

10.98

10.11

9.72

9.27

8.74

7.71

7.34

7.23

26.87

26.62

25.98

25.63

25.42

24.91

21.20

20.44

19.80

18.91

18.14

17.09

16.25

15.09

13.65

12.87

26.82

26.41

26.07

25.79

23.57

20.94

20.50

19.40

18.48

18.00

16.91

16.10

15.03

13.33

12.02

11.11

10.35

9.85

9.60

9.07

8.53

8.04

7.66

7.42

7.16

I 7.05

7.67

7.61

7.60

7.58 i

7.57

7.55

7.46

7.46

8.37

8.37

8.36

8.35

8.32

8.24

7.77

7.71

7.67

7.60

7.57

7.57

7.61

7.61

7.60

7.52

8.42

8.42

8.42

8.39

7.91

7.57

7.55

7.51

7.49

7.49

7.52

7.56

7.64

7.77

7.74

7.66

7.61

7.57

7.57

7.58

7.58

7.59

7.57

7.56

7.53

7.52

687

690

694

705

721

777

824

832

660

663

667

664

662

652

570

570

588

577

579

606

633

671

692

700

632

632

629

630

542

449

476

464

466

486

534

572

626

676

685

687

688

691

694

703

722

745

769

782

803

809

6.91

6.93 !

6.91 !

6.75 I

6.70

6.79

6.34

6.06

7.62

7.52

7g2

7.57

7.49

7.18

6.71

4.98

4.81

4.59

4.57

4.61

484

5.25

5.32

4.77

7.57

7.59

7.68

7.45

5.11

420

4.13

4.28

4.64

4.78

5.17

5.49

6.05

7.07

7.19

6.94

6.85

6.77

6.68

6.81

6.92

7.12

7.11

7.07

i 6.95

i 6.88

68.6

67.3

66.5

64.3

63.1

62.3

57.7

55.0

104.4

102.6

102.8

101.4

99.9

94.9

82.7

60.4

57.6

54.0

52.9

52.3

54.0

57.1

56.1

49.4

103.6

103.1

103.7

100.1

65.9

51.4

50.2

50.8

54.1

55.2

58.3

61.0

65.7

73.9

73.0

69.1

67.0

65.4

64.2

64.6

64.8

65.8

65.2

64.4

63.0

i 62.1

182
P5 """""'"""i

P5

P5 

P5

P5

P5

P5

pg

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

pg

P5

P5

P5

pg

P5

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

 " Q~^ I

2.2 1

4.4 """"""""6.3"""""""""""

7.3

10.8

12.7

15.0

16.8

19.0

20.8

26.8

30.5

35.8

41.0

47.7

51.2

56.2

61.1

65.2

71.4

/ O. O

81.5

88.2

92.4

96.0

0.2

2.6

4.8

5.8

8.0

10.2

12.1

14.1

:jg_2

18.3

20.5

23.9

25.4

30.0

35.5

40.8

46.1

50.6

55.1

60.6

66.1

71.6

76.0

81.4

26.28

25.24

25.05 

24:84

24.57

23.94

23.16

21.38

19.50

19.17

18.61

16.96

16.19

1496

13.56

11.44

10.72

10.14

9.54

9.17

8.79

8.50

8.08

7.55

7.25

7.01

25.38

25.32

24.83

24.64

24.42

24.18

2393

21.58

20.62

19.79

19.08

18.03

17.52

16.17

14.79

12.81

11.42

10.58

9.99

9.46

9.07

8.72

8.51

8.21

8.53 453 I 7.68

8.54 454 I 7.71

8.52 455 | 7.69 "'""""8.49""" ' ^ -- " - T""---"----y;-4~3"------"~---

8.42 463 1 7.03

8.31 ! 466 ! 7.01

8.15 : 450 I 6.43

7.73 ! 416 I 6.03

7.59 I 409 I 5.24

7.56 | 413 | 5.01

7.54 i 424 \ 4.97

7.54 i 482 i 4.99

7.58 1 520 i 5.50

7.64 : 592 ! 5.82

7.71 ! 650 ( 6.49

7.71 679 : 7.07

7.68 683 I 7.03

7.67 I 684 | 7.06

7.64 : 686 1 7.14

7.64 | 691 1 7.15

764 i 699 [ 7.24

7.64 | 712 ; 7.28

7.64 ! 733 7.38

7.61 i 763 i 7.49

7.59 | 778 I 7.47

7.57 i 791 ) 7.31

8.48 ! 473 ! 7.36

8.48 j 472 1 7.32

8.47 j 471 I 7.36

8.47 | 470 | 7.22

8.44 j 467 1 7.05

8.41 | 465 I 7.03

8.33 1 462 I 6.49

7.76 | 426 I 4.86

7.62 i 431 i 4.47

7.53 ) 438 | 4.12

7.49 I 452 I 3.97

7.47 I 450 3.96

7.47 ; 441 ; 4.08

7.55 ; 499 ! 4.60

7.67 i 614 I 6.07

7.67 | 644 I 6.63

7.64 \ 668 I 6.85

7.62 j 670 I 6.86

7.60 | 665 | 6.91

7.57 i 662 i 6.90

7.53 1 667 1 6.74

7.52 i 684 I 6.67

7.52 1 698 ! 6.60

7.50 i 722 j 6.61

104.0

102.5

101.8 """"""""""'"""98:0"""'""""""""""""

92.3

90.9

82.2

74.5

62.4

59.2

58.1

56.4

61.2

63.1

68.2

70.9

69.3

68.7

68.4

68.0

68.3

68.2

68.3

68.5

67.8

66.0

98.0

97.4

97.1

94.9

92.3

91.6

84.2

60.2

54.4

49.4

46.9

45.7

46.7

51.2

65.6

68.5

68.6

67.4

67.0

66.6

63.9

62.7

61.8

I 61.4

183
P6 """"""]

P6

P6

P6

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

86.8

90.1

95.8

97.0

0.5

2.8

4.6

7.0

8.3

10.2

12.5

14.7

16.5

20.3

25.6

31.0

35.4

40.8

45.4

52.3

56.2

61.1

65.0

0.2

2.5

48

6.9

8.6

10.6

13.5

14.9

17.9

21.0

26.0

31.0

35.2

35.6

0.1

2.1

4.5

6.7

8.3

11.0

12.6

15.1

16.6

18.3

20.5

25.1

30.5

7.91

7.79

7.46

7.45

26.32

25.98

25.44

24.92

24.73

24.44

23.93

22.19

20.63

18.84

16.99

15.74

14.69

12.85

11.48

10.55

10.09

9.81

9.66

25.97

25.97

25.56

24.98

24.71

24.34

23.86

2337

20.87

18.37

16.91

15.77

14.32

14.32

26.58

26.22

25.61

24.59

24.05

23.17

22.07

2^8

20.51

19.88

19.23

17.95

16.61

7.46 I

7.44

7.40

7.40

8.58

8.60

8.56

8.39

8.17

7.95

7.61

7.40

7.41

7.44

7.50

7.51

7.57

7.48

7.44

7.42

7.37

72g

7.06

8.58

8.58

8.52

8.31

8.17

7.94

7.68

7.55

7.41

7.41

7.45

7.36

7.20

7.18

8.51

8.52

8.51

8.43

8.27

7.96

7.67

7:57

7.56

7.55

7.51

7.47

7.66

748

760

781

783

411

404

411

422

433

449

477

438

349

345

353

405

589

654

675

692

698

703

709

394

396

399

432

461

519

538

535

416

351

354

395

541

546

507

506

507

449

439

430

417

402

404

411

428

491

619

6.57

6.35

6.02

5.86

7.41

7.42

7.46

6.96

6.24

5.06

3.84

2.27

2.04

3.86

4.66

5.55

5.75

5.90

5.59

5.61

5.60

5.17

3.90

8.43

8.01

7.93

7.54

6.40

5.68

4.89

4.02

3.13

1.71

448

3.89

2.05

1.46

7.59

7.47

7.42

7.23

6.50

5.91

5.01

4.31

4.26

4.40

454

4.33

! 5.36

60.6

58.4

54.9

53.5

100.4

99.9

99.6

91.9

82.1

66.3

49.8

28.5

24.9

45.4

52.7

61.2

62.0

61.1

56.1

55.1

54.4

49.9

37.5

113.5

107.8

106.1

99.8

84.3

74.3

63.3

51.6

38.3

19.9

50.5

42.8

22.0

15.6

103.4

101.2

99.3

94.9

84.5

75.6

62.7

53.0

51.8

52.8

53.8

I 49.9

i 60.2

184
P9 I

P9 \

P9

P9

P9

P9

P9

P9

P9

P9

P9 !

P9 i

P10

P10

P10

P10

P10

P10

P10

P10

pjO

p-jO

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10 

P10

P10

P10

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

36.0

40.2

45.7

50.8

56.3

61.4

66.2

70.3

76.0

80.6

85.6

86.6

0.0

2.4

4.1

7.0

9.9

11.5

12.4

14.7

16.3

18.5

21.1

26.1

31.6

35.8

40.8

45.8

51.5

56.7

60.7

66.9

70.1

76.2

83.3 

861

90.5

95.4

0.1

1.9

4.6

7.0

9.2

10.8

13.1

15.2

16.9

19.2

I 21.0

\ 22.9

14.72

13.11

11.49

10.65

9.76

9.28

9.12

8.95

8.58

8.46

8.31

8.33

27.27

26.68

25.77

25.42

24.39

23.66

22.08

2^ 22

20.95

20.06

19.24

17.77

16.14

14.77

12.89

11.39

10.33

9.83

9.53

9.11

8.95

8.56

8.17 

8.01

7.64

7.28

25.87

25.77

25.71

24.74

24.06

23.67

23.09

2222

21.18

20.36

19.88

19.50

7.66

7.69

7.62

7.59

7.50

7.41

7.34

7.25

7.20

7.22

7.16

7.15

8.62

8.62

8.64

8.58

8.22

7.82

7.61

7.52

7.49

7.49

7.49

7.49

7.54

7.60

7.65

7.66

7.66

7.66

7.65

7.65

7.64

7.63

7.61 

7:60

7.55

7.50

8.63

8.63

8.62

8.38

8.16

7.99

7.76

7.54

7.47

7.44

7.44

i 7.43

605 |

648 i

664 |

673 j

672 !

681 I

694 j

735 i

808 i

822 1

831

832

427

427

427

428

429

427

423

413

409

404

410

433

527

581

i 642

I 676

I 686

i 689

\ 692 __

! 711

! 727

\ r ygg 747 - 

I 773

I 791

i 445

446

1 447

1 476

1 489

j 495

| 4§7

j 423

i 409

i 412

i 417

i 419

6.17 i

6.44 !

6.63 I

6.61

6.62

5.93

5.06

3.95

3.08

2.66 i

2.59

2.32

7.46

7.55

7.62

7.47

7.35

6.58

5.07

4.42

4.40

4.61

4.80

5.15

5.58

5.85

6.52

6.79

7.04

7.18

7.26

7.34

7.36

7.49

7.52 , ...........,.,.......^_......

7.15

7.03

7.41

7.36

7.35

7.16

6.60

5.75

5.33

4.40

3.55

3.29

3.23

3.21

66.6

67.0

66.5

65.1

63.8

56.5

48.1

37.4

28.9

24.9

24.1

21.6

102.9

103.0

102.3

99.6

96.1

83.9

63.4

54.5

53.9

55.5

56.8

59.2

62.0

63.1

67.5

68.0

68.8

69.4

69.7

69.7

69.6

70.2

69.8 ,...... .......... ___.,_........,....

65.5

63.9

99.6

98.8

98.5

94.3

85.9

74.2

68.0

55.2

43.7

39.8

38.7

38.2

185
P11 25.0

Pii | 27.3

P11 I 28.5

P11 i 36.6

P11 | 35.1

P11 j 40.0

pil i 440

p^J2 j o.Q

P12 i 2.0

P12 I 4.0

P12 i 6.2

P12 8.3

P12 J 10.3

p^2 ; 120

P12 I 14.1

P12 | 16.6

P12 \ 18.1

P12 i 20.5

P12 j 25.6

P12 ) 30.5

p;j2 j 354-

P12 i 40.9

P12 i 45.6

P12 I 50.1

P12 I 55.4

P12 j 60.2

P12 i 65.8

P12 I 70.0

P12 I 75.7

P12 ! 80.3

P12 I 85.3

P12 i 96.6

P12 I 91.7

P13 | 0.1

p^3 i 2.6

P13 1 4.5 p^3 | 71

P13 \ 9.2

P13 i 10.7

P13 I 13.3

P13 15.2

P13 ] 16.6

P13 I 18.2

P13 ! 21.0

P13 \ 23.1

P13 j 25.3

P13 I 27.1

Pi3 i 29.1

P13 | 31.4

P13 I 35.5

18.81

18.03

17.53

17.07

15.08

12.87

10.87

27.40

25.86

25.64

25.06

24.67

24.39

23.80

23.33

21.98 2Q 72

1994

18.20

16.66

15.13

12.39

11.13

10.46

10.05

9.87

9.57

9.35

8.96

8.88

8.50

8.11

8.05

26.56

25.74

25.26

24.60

24.22

24.08

23.61

22.89

22.24

21.38

20^7

18.82

18.37

17.98

17.26

16.44

14.85

7.42

7.41

7.41

7.41

7.44

7.47

7.41

8.64

8.66

8.65

8.53

8.33

8.19

7.94

7.84

7.67

7.55

7.51

7.48

7.51

7.53

7.64

7.67

7.66

7.62

7.58

7.54

7.51

7.43

7.39

7.34

7.26

7.19

8.66

8.66

8.56

8.27

8.09

8.03

7.91

7.74

7.67

7.58

7.53

7.51

_L§1_.

7.51

7.51

7.50

7.52

434

464

469

481

562

644

700

559

496

505

547

576

592

611

645

605

484

414

403

433

534

657

686

699

714

722

733

742

762

768

784

798

800

i 559

563

i 568

i 583

i 581

! 611

! 668

593

594

516

410

394

393

396

405

428

j 501

3.43 j

3.38

3.22 i

3.54

3.85

4.50

4.64

9.02

8.27

8.40

7.89

6.87

6.07

5.13

4.87

4.64

4.58

4.81

5.21

5.74

5.77

6.24

6.72

7.06

7.08

6.98

6.77

6.59

6.04

5.58

5.27

4.82

3.28

9.09

9.03

9.06

8.24

6.42

5.48

5.40

5.02

4.62

4.52

4.60

4.91

5.19

5.47

5.67

5.81

6.05

40.3

39.1

36.8

40.1

41.8

46.6

45.9

124.8

111.2

112.5

104.5

90.4

79.4

66.4

62.6

58.0

55.9

57.8

60.4

64.4

62.8

64.0

66.9

69.2

68.8

67.5

65.0

63.0

57.1

52.7

49.4

44.7

30.3

123.8

121.2

120.5

108.3

83.8

71.3

69.7

63.9

58.1

55.8

55.5

57.6

60.4

63.1

64.5

I 64.9

! 65.4

186
P13

P13

p^3

P13

P13

P13

P13

P13

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

41.0

45.6

50.2

55.7

60.4

65.7

70.6

75.3

0.2

3.0

4.6

6.4

9.1

11.0

13.2

14.5

17.4

19.0

20.5

23.5

24.6

27 i

28.7

30.9

35.5

41.0

45.3

52.0

55.9

12.70

11.34

10.59

10.10

9.85

9.57

9.29

8.97

26.29

25.66

25.32

24.60

2433

24.21

23.74

23.51

23.17

22.90

22.15

20.18

19.20

17.73

17.30

16.65

14.82

12.86

11.76

10.77

10.30

7.61

7.65

7.65

7.61

7.58

7.51

7.43

7.35

8.48

8.43

8.36

8.20

8.03

7.97

7.98

7.98

7.95

7.92

7.83

7.67

7.63

7.58

7.56

7.54

7.51

7.52

7.51

| 7.51

i 7.36

!

632

684

706

715

723

735

749

768

686

697

718

727

756

786

804

807

808

801

744

541

475

403

405

418

482

586

654

701

721

6.33

6.58

6.96

7.11

7.04

6.86

6.36

5.48

9.65

9.66

9.53

8.71

6.90

5.89

5.65

5.98

6.17

6.13

5.53

5.63

5.20

5.34

5.48

5.65

5.80

6.09

6.25

6.44

6.12

65.3

65.8

68.4

69.1

68.1

65.9

60.6

51.8

130.9

129.5

127.0

114.5

90.2

76.9

73.2

77.0

79.0

78.1

69.4

67.9

61.5

61.4

62.3

63.4

62.6

63.0

63.1

63.6

59.8

187
Table f. Water quality profiles for Hydroacoustic sampling stations on Lake Powell for January 

1998.

Station Depth Temperature 

_______(m) (Centigrade)

pH Conductance Dissolved Oxygen 

______(us/cm)_____(mg/L)

P1

P1

P1

pi

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

PI

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

0.5

1.0

2.2

4.0

6.1

8.3

9.9

12.1

14.1

16.9

18.0

20.6

22.5

24.4

2gj

28.1

31.3

35.1

39.4

45.5

51.0

55.5

60.8

65.2

70.5

80.4

91.1

100.8

109.9

119.9

130.1

143.0

0.5

3.0

4.0

6.1

8.2

10.3

12.2

16.0

18.2

20.5

24.9

30.0

10.24

10.16

9.98

9.85

9.81

9.78

9.78

9.77

9.76

9.76

9.76

9.75

9.75

9.75

9.74

9.74

9.74

9.74

9.72

9.70

9.62

9.60

9.49

9.14

8.64

7.61

7.43

7.41

7.52

7.57

754

7.46

10.37

10.26

10.08

10.02

10.01

10.00

9.99

9.98

9.98

9.98

9.98

9.97

7.57

7.57

7.56

7.56

7.56

7.56

7.56

7.56

7.56

7.56

7.56

7.56

7.56

7.56

7.56

7.56

7.55

7.55

7.56

7.56

7.55

7.55

7.50

7.24

7.18

7.14

7.12

7.09

7.04

6.99

6.96

6.91

7.54

7.54

7.54

7.53

7.53

7.53

7.53

7.53

7.52

7.52

7.52

! 7.52

618

619

619

619

619

620

620

619

619

619

619

619

619

619

618

618

618

618

617

617

618

619

636

759

111

795

814

834

853

886

882

887

613

616

617

617

617

618

618

618

619

619

619

620

8.45

8.46

8.45

8.45

8.44

8.43

8.41

8.38

8.37

8.36

8.36

8.35

8.35

8.34

8.34

8.33

8.33

8.32

8.33

8.32

8.32

8.26

7.95

5.75

5.45

5.44

5.26

4.98

4.35

3.41

3.05

2.44

8.39

8.39

8.37

8.33

8.30

8.29

8.28

8.24

g22

8.21

8.19

g|7

188
 . ........._...

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P2

P3 .....,.....,_,........,....

P3

P3

P3

P3

P3

P3

P3 pg 

P3

P3

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

P4

35.6 :

39.7

45.1

50.1

55.4

60.3

64.9

71.1

80.3

90.1

100.3

109.8

119.7

129.3

139.2

1.3 ,....., ..__......., 

4.4

7.6

9.1

12.5

14.9

18.7

21.3 ... __.

29.2

302

1.2

2.0

3.8

6.9

8.2

10.0

12.0

15.0

20.6

24.8

30.2

35.1

40.9

45.7

50.3

55.3

60.3

69.9

80.2

90.4

99.9

110.7

120.3

................. __.._....

9.91 ;

9.88 !

9.80 i

9.79 !

9.55

9.27

8.80

8.01

7.46

7.28

7.29

7.42

7.41

7.38

10.29 

16:26

10.05

9.96

9.95

9.94

9.90

9.89

9.90 .._..^__.,..

9.89

9.89

10.38

10.36

10.38

10.36

10.36

10.35

10.35

10.35

10.35

10.35

10.35

10.34

10.35

10.38

16.61

9.52

9.40

8.65

8.20

1 7.58

! 7.16

I 7.15

! 7.12

7.52 ;

7.53

7.53

7.52 : 7.32 ;

7.23

7.21 \

7.20 :

7.15 i

7.12 i

7.10 \

7.08 !

7.02 i

6.98

6.94

7.56 """"""7.56"""""""";

7.56

7.55

7.55

7.55

7.55

7.55

7.55 """'""T56 """"""""

7.56

7.56

7.57

7.58

7.57

7.57

7.57

7.57

7.57

7.57

7.57

7.57

7.56

7.56

7.56

7.32

7.25

7.25

7.29

7.30

7.29

7.21

7.17

7.15

I 7.14

621

622

622

623

733

778

788

791

793

799

820

836

857

870

876

611 ............... ....^_...... ..............

612

612

612

612

611

611

611 ""'"'""""""611""""""""""

611

611

613

615

616

617

617

616

616

617

616

616

616

616

617

702

746

771

789

798

866

803

808

822

831

8.1 7

8.18

8.18

8.15

6.60

5.57

5.62

5.59

5.40

5.36

5.21

4.90

3.89

3.38

2.88

8.62 """""""""""""""8.54""""""""""""""""""

8.52

8.45

8.40

8.38

8.39

8.41

8.40 """"""""""""""""""8:41'"'""'""'""""""""""""""""""

8.41

8.41

7.88

7.89

7.89

7.90

7.90

7.90

7.90

7.89

7.88

7.88

7.87

7.86

7.82

5.62

5.27

5.36

5.74

5.91

5.84

5.24

5.24

5.02

4.92

189
 '- "-p^ "

P4

P5 

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5

P5 

P5

P5

P5

P5

P5

__L_P5___

P5

P5

P5

P5

P5

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

P6

TsaT 1

140.4

0.9 

2.0

3.8

6.4

8.0

10.0

10.4

15.5

20.5

25.5

31.8

35.4

40.6

47.4 

503

54.7

61.0

65.9

70.0

81.3

90.4

1Q27

110.4

117.6

130.1

0.5

1.9

5.0

7.0

9.7

13.2

16.4

19.9

! 25.0

! 30.4

35.0

40.0

45.3

49.9

56.3

60.0

65.2

70.8

80.1

90.5

99.4

109.0

115.4

7:18

7.19

10.03 

10:02

10.03

10.04

10.04

9.82

9.98

9.75

9.73

9.72

9.72

9.72

9.71

9.61 

9.10

8.61

8.73

8.14

8.02

7.61

7.53

7.44

7.41

7.38

6.95

9.86

9.87

9.83

9.79

9.77

9.74

9.74

9.74

9.74

9.74

9.76

9.79

9.73

8.78

8.25

8.22

8.32

8.13

7.79

7.66

7.59

7.53

7.52

7.10 850

7.04 858

7.60 585 

760 584

7.60 1 584

7.60 584

7.60 584

7.59 i 585

7.59 i 584

7.58 j 585

7.58 I 585

7.57 I 585

7.57 I 585

7.57 1 585

7.57 j 585

7.56 j 587

7.48 T 597

7.39 j 646

7.49 1 776

7.54 i 783

7.55 I 780

7.56 i 773

7.55 ) 771

7.55 769

7.54 I 769

747 777

7.14 | 814

7.51 ! 588

7.50 i 590

7.50 1 590

7.50 i 590

7.48 I 592

7.48 i 591

7.49 I 590

7.49 i 591

7.49 i 591

7.48 i 591

7.47 ! 592

7.45 ; 596

7.45 i 594

7.39 I 586

7.35 ! 597

7.26 I 653

7.40 | 792

7.48 i 792

7.52 ! 783

7.52 i 778

7.52 i 777

7.50 | 777

7.49 ! 777

.....,....^..._.. ...... ............

3.39

8.43 ..... ................._ ............., .................

8.44

8.43

8.43

8.40

8.42

8.27

8.24

8.23

8.21

8.20

8.18

8.08 ................... .._.,... .....................

6.97

7.53

7.99

8.07

8.21

8.20

8.21

8.13

7.52

4.46

8.05

8.05

8.06

8.01

7.90 ..

7.95

7.94

7.92

7.92

7.84

7.63

7.67

7.37

7.20

6.30

7.38

7.80

8.07

8.16

8.10

8.03

7.92

190
P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P7

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P8

P9 pg 

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

P9

0.7 !

2.1

4.2

6.1

8.0

10.9

13.3

17.4

20.7

25.7

30.5 I

35.0 !

40.4

45.2

50.7

55.3

61.5

62.0

6.9

3.6

5.0

7.1

9.9

12.1

15.6

18.1

21.0

23.9

2gj

28.2

29.1

30.3

31.6

32.4

0.6 273 

4.2

6.6

8.3

10.6

15.3

20.9

25.1

30.0

34.8

40.5

45.9

50.0

1 55.4

: 60.1

10.02 I

9.96 I

9.64 j

9.61

9.61

9.61

9.59

9.59

9.59

9.58

9.58

9.57

8.88

8.53

7.90

7.50

7.23

7.22

9.70

9.25

9.16

9.09

9.07

9.06

9.06

9.04

9.03

8.34

8.04

7.80

6.07

6.01

5.96

5.93

10.09 

16.00

9.81

9^

9.70

9.69

9.69

9.67

9.67

9.68

9.65

9.59

9.61

10.06

9.91

9.02

7.55 :

7.54

7.53

7.52

7.52

7.52

7.51

7.51

7.51

7.51

7.51

7.51

7.49

7.49

7.48

7.48

7.47

7.31

7.58

7.58

7.58

7.56

7.55

7.55

7.56

7.55

7.55

7.56

7.55

7.55

7.47

7.45

7.44

7.42

7.44 

7:46

7.39

7.37

7.36

7.36

7.35

7.35

7.35

7.35

7.35

7.35

7.25

7.19

7.22

7.41

546

547

548

548

548

548

548

548

548

548

548

548

558

563

577

583

589

591

545

546

546

546

546

546

546

546

546

555

561

566

627

625

626

628

611 ....................__.......................,

613

608

607

607

607

607

606

607

605

599

651

775

; 797

786

8.34

8.35

8.29

8.25

8.23

8.23

8.22

8.22

8.21

8.19

8.18

8.18

8.21

8.34

8.51

8.66

8.71

8.67

8.72

8.78

8.77

8.68

8.61

8.59

8.63

8.57

8.60

8.73

8.84

8.59

9.16

g_22

9.20

9.20

6.66 .......,,........,,__...,........, 

6.58

6.48

6.44

6.42

6.37

6.38

6.39

6.39

6.37

6.26

5.15

4.53

4.88

6.94

191
 pg------

P9

P9

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10

P10 

PI 10

P10

P10

P10

P10

P10

P10

P10

P10

P10

 P11 p-ff - -

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P11

P12

P12

P12

P12

P12

P12

P12

P12

P12

66:5

69.9

74.8

0.8

2.4

4.2

5.9

8.1

10.6

14.9

20.4

24.9

30.6

35.1

40.0

44.8 

50 6

55.5

60.5

65.3

69.9

80.4

89.7

100.2

110.3

112.4

0.8 ...___.,....

4.1

6.6

8.0

10.0

12.3 _2

16.7

18.6

20.1

25.0

30.6

35.3

37.4

0.7

2.1

4.0

6.2

9.3

! 12.0

\ 15.0

I 20.1

! 25.4

 8J5"-"---]

8.03

8.06

9.85

9.80

9.78

9.78

9.76

9.76

9.75

9.75

9.74

9.74

9.74

9.74 I

9.73 | 

9.42

8.89

8.05

7.37

7.25

7.05

7.03

7.66

7.66

6.99

9.66 

9 g2

9.49

9.47

9.43

9.43

9.42

9.42

9.42

9.42

9.42

9.38

9.27

9.06

9.07

9.93

9.88

9.55

9.51

9.49

9.48

9.47

9.47

9.47

~~-y45 

7.47

7.42

7.52

7.51

7.51

7.52

7.51

7.51

7.51

7.51

7.51

7.51

7.51

7.51

7.51 """"7.54""' "

7.56

7.57

7.56

7.55

7.54

7.54

7.54

7.53

7.52

7.66 

7.66

7.65

7.65

7.64

7.64

7.64

7.63

7.63

7.63

7.64

7.64

7.65

7.68

7.68

7.62

7.62

7.62

7.62

7.61

7.61

7.61

7.61

7.61

791

790

789

611

613

614

615

615

616

616

616

617

617

617

617

620 

684

709

740

756

757

766

759

759

760

760

618 

620

621

622

622

623

623

623

623

623

624

624

623

623

623

626

630

630

630

630

630

631

631

631

,...,.,.,...............__... .....,., ..........

7.50

7.10

8.09

8.09

8.09

8.07

8.06

8.05

8.04

8.02

8.00

7.98

7.97

7.96

7.94 

7.91

8.15

8.41

8.54

8.57

8.57

8.55

8.52

8.49

8.46

8.65 

8762

8.61

8.58

8.53

8.50

8.47

8.44

8.45

8.45

8.44

8.44

8.49

8.62

8.63

8.42

8.38

8.40

8.38

8.37

8.35

8.34

8.30

8.29

192
P12 i

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

P12

pi 2

pi 3

P13

P13

P13

P13

pi 3

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P13

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

P14

30.0 I

35.0

40.6

45.4

49.9

54.7

60.0

64.9

69.9

74.7

79.3

85.1

89.9

0.5

3.1

5.8

10.3

15.2

20.1

25.4

30.1

35.1

39.6

46.0

50.4

54.7

60.5

64.8

70.7

74.7

78.7

0.8

3.0

5.2

8.1

^Q

16.1

20.0

25.8

30.0

36.1

40.5

44.7

50.3

54.7

59.5

9.45 j

9.39 I

9.30

8.88

8.41

7.83

7.20

6.52

6.37

6.33

6.30

6.29

6.28

9.56

9.49

9.43

9.42

9.39

y .0 /

9.23

9.22

9.20

8.87

8.08

7.77

6.75

6.66

g2g

6.10

6.06

6.06

9.15

9.14

9.13

9.05

9.01

9.00

8.96

8.93

8.79

8.38

8.15

7.41

644

5.31

5.16

7.61

7.61

7.61

7.62

7.63

7.63

7.63

7.62

7.62

7.61

7.61

7.61

7.60

7.61

7.61

7.61

7.60

7.60

7.60

7.61

7.61

7.61

7.62

7.63

7.63

7.62

7.62

7.62

7.61

7.61

7.61

7.65

7.65

7.65

7.65

7.64

7.63

7.64

7.64

7.64

7.65

7.65

764

7.64

7.62

7.62

632 i

642

662

685

706

728

748

770

774

775

776

776

777

632

633

634

635

636

638

649

649

653

680

716

726

762

765

778

784

785

785

652

653

653

655

656

657

658

659

671

693

702

731

767

| 813

i 817

8.28

8.25

8.27

8.38

8.54

8.72

8.89

9.10

9.14

9.13

9.13

9.12

9.05

8.56

8.51

8.44

8.40

8.37

8.36

8.43

8.44

8.45

8.51

8.74

8.82

9.09

9.17

9.25

9.28

9.27

9.25

8.78

8.79

8.80

8.76

8.69

8.66

8.67

8.66

8.68

8.77

8.82

9.08

9.46

9.86

: 9.92

193
Table a. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for November 

1995.

Station Depth 

(m)

Temperature 

(Centigrade)

PH Conductance 

(us/cm)

Dissolved Oxygen 

(mg/L)

M1

M1

M1

Ml

M1

M1

Ml

.........,.....,., .....,... ..

M1

M1

M1

M1

M1

M1

Ml

M1

M1

M1

M1

M1

M1

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2 

M2

M2

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

0.3

2.9

5.4

6.8

9.1

11.6

14.8 ......,. ...._.............,.,...

23.9

28.9

34.2

40.5

46.9

52.5

57.6

62.5

67.7

75.2

80.1

84.9

90.1

0

0.3

2

5

10.2

15.1

19.8

25.1

30.1

35.7 """"""""41

41.3

0.6

2

5.1

8.1

10.1

15

20

24.9

30

35.1

40

18.49

18.49

18.51

18.51

18.51

18.51

18.51 """""""""""""18.51"" '""""""""

18.5

18.49

18.45

18.25

16.38

14.19

13.57

13.25

12.91

12.67

12.49

12.35

12.25

13.55

17.71

17.62

17.57

17.54

17.52

17.53

17.5

17.49

17.47 

17:48

17.48

18.28

18.3

18.31

18.31

18.3

18.29

18.31

18.3

18.29

17.49

16.21

7.73

7.73

7.74

7.73

7.74

7.73 

7.73

7.74

7.76

7.75

7.69

7.5

7.47

7.46

7.46

7.49

7.47

7.46

7.45

7.44

7.96

8.05

8.06

8.06

8.05

8.05

8.05

8.05

8.05

8.05 

8:02

8.02

7.95

7.95

7.95

7.95

7.95

7.94

7.94

7.93

7.92

7.62

I 7.57

1068

1068

1068

1068

1068

1068

1068 

1068

1068

1067

1067

1063

1059

1073

1066

1058

1043

1045

1046

1048

1050

1123

1067

1070

1071

1072

1072

1076

1072

1072

1078 

1090

1090

1031

1033

1035

1036

1037

1041

1040

1042

1042

1009

: 1023

6.88

6.97

6.93

6.9

6.9

6.84

6.82 """"6."84""""'""""""""""""

6.85

6.82

6.66

6.09

4.36

4.7

5.04

5.24

5.55

5.48

5.51

5.37

5.26

9.73

8.38

8.37

8.36

8.29

8.27

8.24

8.25

8.27

8.23 

8;09

8.07

7.51

7.55

7.45

7.31

7.5

7.43

7.76

7.78

7.76

5.22

4.9

194
M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5 

M5

M5

M5

M5

M5

M6

M6

M6 

M6

M6

45.1

50

54.8

60.2

65

66.8

70.7

80

90.6

99.6

0.5

5

10.4

15

20.3

25.8

30.3

35.7

40.3

45

50.5

55.3

60.2

64.7

69.9

80.1

QQ^

100.9

0.5

0

5.1

10

15.1

20.3

24.7

30.2

35.7

40.1

45.2

50.1 

60

70.1

80.6

90.4

100.7

0.4

2

5.1 _..__ .

15.1

15.53

14.48

14.02 __

13.26

13.22

13.03

12.42

12.25

^2.14

18.08

18.09

18.02

17.99

17.97

17.96

17.95

16.68

16.03

15.44

14.65

13.82

13.4

13.07

12.94

12.64

^224

12.15

17.93

17.64

17.56

17.4

17.36

17.35

17.34

17.33

17.29

16.22

14.97

14.37 - ' ^5f-""-""-~ -

12.93

12.45

12.16

12.05

17.96

17.74

17.68 ... ,...___...... .........

17.65

7.55

7.55

7.56

7.55

7.58

7.58

7.58

7.57

7.54

7.52

8.07

8.08

8.08

8.08

8.08

8.08

8.07

7.88

7.79

7.72

7.67

7.66

7.66

7.66

7.66

7.67

7.66

7.61

8.13

8.13

8.14

8.14

8.13

8.13

8.13

gJ2

8.12

7.94

7.91

7.78 

7.66

7.66

7.67

7.66

7.64

8.08

8.09

8.1 .......... .,_..........

8.09

1034 |

1044

1044

1048

1033

1030

1032

1030

1033

1041

992

1005

1006

1004

1004

1004

1004

950

963

992

^22

 __

1031

^29

1026

1023

1019

1031

964

972

971

973

974

974

973

974

976

956

926

956 

1018

1013

1005

1004

1013

957

959

958 "957 

958

4.94

5.15

5.48

5.59

5.91

5.94

6.01

5.92

5.73

5.5

8.33

8.29

8.3

8.27

8.25

8.23

8.22

6.98

6.32

5.75

54

5.59

5.77

5.92

5.98

6.06

6.05

5.58

8.56

8.59

8.59

8.61

8.56

8.55

8.53

8.52

8.5

7.47

7.55

6.49 ............................ _,.............. . ..

5.9

6.09

6.09

5.89

8.37

8.18

7.94 ................... .._... ..,.. ...__

i 8.15

195
1/16

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M7

M7 

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

20

25.3 i

30.1 i

35 !

40.1 !

45 !

50

55.4

60.2

65

69.9

80.6

90.4

100.3

0.3

1.8 .,.... __,........,......

9.9

15.1

20.1

25.1

30.2

35

40

44.7

50.2

55

59.9

65.1

70.2

75.3

80.1

84.6

90

95.1

0.3

2

5

5.1

10.1

15

19.9

24.8

30.1

35.1

39.7

44.9

49.7

55.3

61.5

17.65 j

17.65

17.63

16.75

15.62

14.83

14.22

13.44

12.98

12.51

12.39

12.07

11.97

11.93

17.7

17.73 """""""""" 1 7. 71 """'"""""""""""

17.7

17.72

17.71

17.72

17.51

16.21

15.03

14.47

13.91 , 

12.84

12.59

^243

^227

12.11

12.05

11.95

11.87

17.66

17.7

17.72

17.71

17.71

17.71

17.7

17.69

17.05

16.24

15.72

15.25

14.73

14.46

i 14.21

8.09

8.09

8.09

8.03

7.98

7.93

7.82

7.65

7.65

7.65

7.63

7.58

7.56

7.54

8.12

8.13 

 ...,..__

8.13

8.13

8.12

8.12

8.11

8.1

8.07

8.03

7.91

7.71

7.67

7.64

7.61

7.59

7.55

7.54

7.53

7.52

8.14

8.15

8.15

8.15

8.15

8.14

8.14

8.14

i 8.1

I 8.08

j 8.05

I 8.06

I 8.05

I 8.01

I 7.98

958

958

958

915

905

907

920

967

963

949

951

952

980

987

945

947 

948

949

950

950

950

942

907

895

891

902

929

933

936

937

939

945

948

953

966

934

938

941

940

941

941

942

941

924

912

902

898

892

890

891

8.17

8.11

8.18

7.51

7.49

7.42

6.84

5.43

5.5

5.83

5.65

5.11

5.01

5.01

8.55

8.56 .................... ..__ .........................

8.57

8.58

8.56

8.56

8.57

8.79

9.04

8.91

8.05

6.36

6.02

5.74

5.48

5.27

4.93

4.84

4.75

4.6

8.86

8.85

8.86

8.86

8.84

8.83

8.83

8.82

8.8

8.97

9.01

9.19

9.31

9.11

I 8.92

196
M8 I 70.2 I

M8 | 79.8

M9 j 0.3

M9 ! 2

M9 i 4

M9 ! 6.2

M9 i 9.1

M9 I 13.4

M9 | 15.7

M10 1 0.3

M10 i 0.3

M10 ! 5.4

M10 \ 10.1

M10 | 15.2

M10 i 20

M10 ; 25.1

M10 i 30.1

M10 J 40.2

M10 i 44.9

M10 1 49.8

M10 1 60.8

Mil I 0.2

M11 ! 2

M11 I 4.9

M11 ! 9.9

M11 i 15.5

M11 I 20.1

M11 | 25

M11 ! 30.3

Mil i 34.9

M11 i 40

12.42

12.04

13.29

13.19

13.02

13

12.94

12.86

12.79

17.19

17.19

17.17

17.13

17.13

17.11

17.1

17.1

16.83

15.8

15.23

12.98

17.46

17.36

17.19

17.15

17.15

17.15

17.14

17.14

16.92

16.66

7.54 932

7.47 935

8.01 i 859

7.99 861

7.97 ; 864

7.97 : 863

7.98 \ 864

7.99 \ 864

7.97 I 865

8.14 i 966

8.14 961

8.15 979

8.14 i 980

8.14 i 980

8.13 : 981

8.12 1 983

8.11 i 985

8.05 987

7.76 l 976

7.65 i 998

7.6 I 1017

8.03 1 1030

8.04 i 1032

8.04 \ 1035

8.04 1 1037

8.03 ! 1037

8.03 i 1037

8.03 i 1038

8.03 \ 1038

7.97 I 1043

7.8 ! 1054

5.04

4.42

9.81

9.68

9.51

9.42

9.51

9.6

9.57

8.59

8.59

8.6

8.61

8.6

8.57

8.48

8.42

7.75

5.82

4.9

4.88

8.61

8.56

8.59

8.53

8.49

8.46

8.44

8.42

7.9

6.47

197
Table b. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for January 

1996.

Station Depth 

(m)

Temperature 

(Centigrade)

pH Conductance 

(us/cm)

Dissolved Oxygen 

(mg/L)

Dissolved Oxygen 

(%satu ration)

M1

M1

Ml

M1

M1

Ml

M1

M1

M1

M2

M2

M2

M2

M2

M2

M2

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M5

M5

M5

M5

M5

0.6 I

10.5

19.9

29.6

40.1

54.3

69.9

85.3

97.2

0.5

5

10.2

20.2

30.1

39.8

40.2

0.3

4.9

10.4

19.8

30.5

40

55.2

70

85.2

85-2

98.4

0.4

5.3

10.4

20.3

30.2

39.5

52.2

61.9

70.9

77.9

90.8

97.9

0.5

5

9.8

20.4

30.2

13.7 |

13.39

13.36

13.27

13.27

13.25

13.24

12.94

12.38

13.62

13.32

13.27

13.24

13.22

13.24

13.24

14.27

13.52

13.41

13.3

13.3

13.29

13.26

13.13

^266

^266

12.45

13.1

13.11

13.11

13.1

12.98

12.94

12.87

12.76

12.58

12.5

12.41

^237

14.53

13.07

12.94

12.89

i ^2.87

8.09

8.08

8.08

8.07

8.06

8.06

8.03

7.86

7.69

8.1

8.09

8.09

8.09

8.1 1

8.09

8.08

8.11

8.1

8.08

8.06

8.06

8.05

8.06

7.97

7.78

7.78

7.71

8.16

8.16

8.16

8.14

8.15

8.17

8.17

8.14

8.08

8.07

8.05

7.98

8.2

8.19

8.18

8.17

\ 8.16

1034

1038

1038

1039

1039

1039

1039

1033

1029

1034

1038

1039

1042

1047

1054

1059

1027

1031

1034

1034

1035

1034

1038

1033

1008

1008

1016

997

1001

1001

1002

990

987

985

986

989

993

996

999

970

975

976

977

975

9.18 \ 91.8

9.1 i 90.4

9.04 I 89.8

8.95 I 88.7

8.91 j 88.3

8.84 i 87.6

8.75 86.6

7.13 [ 70.1

5.46 | 53

9.17 [ 91.6

9.15 ! 90.7

9.14 ! 90.6

9.14 ! 90.5

9.12 | 90.3

9.15 j 90.6

8.96 ! 88.7

9.18 i 93

9.11 ? 90.8

9.02 89.6

8.91 ; 88.4

8.89 I 88.1

8.82 I 87.5

8.88 I 87.9

8.25 I 81.5

g_;j2 | 598

6.14 I 60.1

5.61 I 54.6

8.29 I 81.8

8.48 i 83.8

8.42 | 83.1

8.42 ! 83.1

8.34 i 82.1

8.47 i 83.3

8.61 ; 84.5

8.61 1 84.3

8.08 i 78.8

7.93 ! 77.2

7.89 1 76.7

727 j yog

9.41 | 95.9

9.43 I 93.1

[ 9.28 ! 91.3

9.21 1 90.5

f 9.21 i 90.5

198
M5

M5

M5

M5

M5

M5

M5

M6

M6

M6

M6

M6

M6

M6

M6

M6 

M7

M7

M7

M7

M7

M7

M7

M7 

M7

M7

M7

M7

M7

M8

M8 

M8

M8

M8

M8

M8

M8

M8

M8

M9

M9

M9

M9

M9

M10

M10

M10

M10

M10

M10

39.9

49.8

59.6

70

81

90

97.7

6.6

4.9

10

20.1

29.9

39.9

50.3

60

69 """"""""6.6"" """""'

5.3

JJQ_2

20.1

29g

39.7

40.1

50 ,......_£__..._.

69.9

79.5

89.5

90.8

0.3

"10"

20.4

30.3

40.5

50.5

59.6

70.2

78.4

0.4

4.9

10.3

15.4

17

0.5

5.2

^Q2

20.3

I 29.4

i 41

12.87 |

12.85

12.81

12.76

12.54

12.31

12.3

13.42

12.99

12.95

12.95

12.91

12.86

12.79

12.73

12.4 ....... ..........__

12.85

12.77

12.68

1254

12.26

12.26

12.18 """"""""'""TiTsl"""'""""""""

11.66

11.28

11.09

10.99

15.07

12.97 """""""""""12.79""""""""""""

12.66

12.58

12.15

11.88

11.42

11.19

10.95

11.76

10.74

10.21

9.87

9.84

13.43

13.01

12.95

12.84

12.84

12.82

8.15 ! 978 I

8.15 i 980 !

8.15 ! 980 )

8.14 I 984 ;

8.02 ; 979 !

7.81 993 I

7.75 ! 1002 !

8.26 [ 919 \

8.26 i 925 :

8.25 925 i

8.17 ; 963

8.16 976 I

8.15 ! 976 !

8.15 ! 980 i

8.12 I 973 \

8.09 j 926 i """""""'8.3"""""""]"'""""""""""" 898""" """"""""""""""1

8.29 j 898 j

8.28 i 898 \

8.27 I 894 \

8.26 \ 879 |

8.25 ! 860 !

8.25 i 860 i

8.25 I 861 ;

''''"""8:'25"'"'"''"''"""t""""""""""""""8"49"""""""""""]

8.25 i 842 1

8.24 i 825 !

8.22 : 816

g22 j 812 ;

8.31 i 886

8.31 I 891 """"""""""8T3""""""""""f" """ 893

8.27 i 891

8.26 j 892

8.25 I 869

8.24 I 850

8.22 I 819

8.21 i 810

8.16 ! 802

8.29 i 761

8.24 i 761

8.24 | 774

8.16 j 782

g^4 j yg2

8.23 i 964

8.22 i 965

8.21 I 965

8.18 1 967

8.18 l 970

8.17 1 976

9.14 i

9.04

9.07

9.08

8.21

6.49

5.81

9.14

9.29

9.3

8.97

8.86

8.79

8.81

8.58

8.38 ..... .............,... ....._.._..... .. ..................

9.9

9.7

9.62

9.58

9.55

9.68

9.57 """"""""""""""""""""9:67""""""""""""""""""""""""

9.84

9.88

9.89

9.96

10.02

10.16 """""""""""""""""""""""i"67l"3""""""""""""""""""""""""""""""

9.88

9.85

9.92

9.98

10.15

10.08

9.73

10.93

11.02

11.07

10.79

9.92

10.02

9.91

9.82

9.67

9.54

9.45

89.8

88.8

89

88.9

80

62.9

56.3

90.9

91.4

91.5

88.3

87.1

86.2

86.4

84

81.4 """'"" """'96'."8""""""""""""""

97.2

95

94

93.4

92.5

93.7

92.5 """'""""'""" """"92":8"""""""" """"""

93.9

93.6

93.3

93.7

103.2

100 '"""""""""'""""""99":2""""""""'"""""""'""""

96.5

96

95.8

95.8

96.4

95.3

91.4

104.6

103

102.2

98.8

90.8

I 99.6

I 97.6

96.6

94.9

93.6

! 92.7

199
M10

M10

M10

M10

M10

M11

M11

M11

M11

M11

M11

50.3

61.7

70

80.7

90.4

0.3

5.3

10.2

20

30.3

39.5

12.56

^2.48

12.28

12.14

12.08

13.01

12.55

12.51

12.38

12.29

11.9

8.19 ) 990

8.2 ; 995

8.2 i 1006

8.2 I 1016

8.2 ; 1019

8.26 985

8.25 987

8.25 993

8.22 1002

8.24 \ 1004

8.2 I 1068

9.53

9.56

9.71

9.74

9.7

9.96

10

9.92

9.86

9.9

9.85

92.9

93.1

94.1

94.1

93.6

98.2

97.5

96.6

95.7

96

94.7

200
Table c. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for May 1996

Station Depth Temperature pH 

_______(m) (Centigrade)____

Conductance Dissolved Oxygen Dissolved Oxygen 

(us/cm)_____(mg/L)_____(%saturation)

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

0.6

1

2.1

3.2

4

5

5.3

6.1

6.7

7.1

8

9

10.2

15

20

25.2

30

35.1

40.4

45.1

50

55.1

60

65

70.3 .......... v ..,....,., ............

74.8

80.2

85

89.9

95.5

99.6

6.4

1

2

3

4

4.9

6

7

8

9

10

11.1

{ 11.9

! 13.1

20.15 j

20.28 !

19.9

19.82

19.1

19.06

19.06

18.93

18.98

18.83

18.84

18.81

18.8

18.18

16.85

16.11

15.71

15.44

14.48

13.94

13.55

13.4

13.33

13.2

13.12

13.06

13

12.98

12.94

12.89

12.85

21.9

21.89

21.9

21.9

21 g

21.89

21.53

21.16

20.98

20.86

20.76

20.68

20.56

20.39

8.53

8.53

8.54

8.54

8.54

8.54

8.54

8.54

8.54

8.54

8.55

8.54

8.55

8.52

8.43

8.36

8.32

8.29

8.18

8.13

8.1

8.08

8.07

8.05

8.04

8.02

8.01

8.01

7.99

7.99

7.98

8.55

8.55

8.55

8.55

8.55

8.55

8.56

8.58

8.59

8.6

8.6

8.62

8.6

8.57

1038

1037

1039

1040

1039

1639

1039

1040

1040

1041

1041

1041

1041

1042

1041

1041

1040

1039

1040

1039

1039

1041

1043

1046

1048

1047

1047

1046

1046

1046

1044

1649

1062

1063

1066

1065

1068

1077

1091

1101

1108

1113

1131

1129

1169

9.85 !

9.84 ;

9.89 !

9.88

10.01

10.03

10.03

10.04

10.05

10.08

10.08

10.08

10.11

10.16

10.01

9.79

9.65

9.51

g

8.78

8.64

8.53

8.49

8.32

8.11

7Q2

7.76

7.68

7.5

7.44

7.33

£27

9.28

9.3

9.32

9.33

9.39

9.52

9.83

10.06

10.17

10.23

10.41

iQ2g

1014

112.8

113

112.6

112.4

112.3

112.4

112.4

112.2

112.4

112.3

112.5

112.3

112.6

111.8

107.2

103.2

100.8

98.8

91.6

88.3

86.2

84.8

84.2

82.3

80.1

78.1

76.4

75.6

73.8

73.1

71.9

109.8

109.9

110.2

110.5

110.6

111.2

112

114.9

117.1

118.1

118.6

120.4

118.8

116.7

201
M2 i

M2 i

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M3

M3 

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

14.1 \

15 !

16.1 i

17.1 I

18 i

... Jl. ............... I

20.1 i

21 !

25 i

29.9 i

35 I

40 !

45 |

47.3 i

0.5

1 !

.......... ^ ....

3.14567o9

10

11

12

13

13.8

15

16

17.1

18.8

19.9

25.1

30.1

35.2

40.1

45.1

49.9

55.3

60.1

65

70.1

75

80

85.1

90

95.2

99

20.59

20.3

18.53

18.36

17.9

17.26

16.71

16.71

16.2

15.59

14.76

14.27

13.68

13.6

23.01

23.02 

22:23

21.89

21.63

21.47

21.41

21.33

21.28

20.46

19.67

19.11

17.61

17

16.8

16.69

16.49

16.42

16.17

15.95

15.22

14.85

14.47

13.92

13.61

13.4

13.25

13.09

12.99

12.87

12.81

12.79

12.75

12.71

12.68

12.67

8.56

8.4

8.38

8.39

8.39

8.37

8.3

8.3

8.21

8.16

8.048

7.95

7.94

8.51

8.51 

8.52

8.52

8.52

8.52

8.52

8.52

8.52

8.53

8.54

8.53

8.47

8.46

8.46

345

8.43

8.42

8.38

8.36

8.28

8.25

8.21

8.2

8.13

8.12

8.1

8.11

8.09

8.05

8.04

8.028

7.97

7.95

\ 7.93

1264 I

1468

1242

1216

1149

1103

1103

1101

1112

1101

1095

1084

1072

1068

1037

1036 

1040

1037

1037

1038

1038

1039

1039

1038

1041

1033

1014

1026

1028

1028

1029

1030

1029

1027

1018

1015

1011

994

1021

1014

1017

1008

1009

1010

1014

1017

1019

^026

1026

1029

9.92

9.24

9.36

9.42

9.5

9.439

8.97

8.34

8.23

7.68

7.51

7.26

7.1

9.02

9.02 

9:13

9.14

9.2

9.23

9.22

9.25

9.26

9.55

9.83

10.04

10.19

10.31

10.31

10.21

10.12

10.1

9.87

9.69

9.35

9.25

9.12

9.19

8.85

8.81

8.71

8.74

8.67

8.35

8.21

7.97

7.77

7.31

7.03

6.72

114.6

106.3

103.9

104.1

104

101.8

96.1

95.8

88

85.8

78.6

76.1

72.6

70.9

109.1

109.2 

108:8

108.2

108.5

108.5

108.2

108.3

108.4

110

111.5

112.6

110.8

110.7

110.3

\ 108.9

; 107.5

! 107.1

104.1

i 101.7

f 96.7

I 94.9

I 92.8

I 92.4

! 88.4

i 87.5

I 86.3

I 86.3

i 85.4

( 82

; 80.5

\ 78.2

! 76.2

I 71.5

! 68.8

i 65.7

202
M4 )

M4 ;

M4 1

M4 |

M4 |

M4 !

M4 i

M4 1

M4 I

M4 \

M4 i

M4 1

M4 i

M4 !

M4 !

M4 I

M4 ;

M4

M4 !

M4 .^.,,,,,^,,

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

0.6 ! 21.49 I

2 21.27

2.9 ! 21.24

3.9 I 21.21

5.1 ! 21.23

gg j 21.22

6.9 I 21.22

8.1 i 21.08

9 i 20.98

9.9 1 20.37

12 i 19.54

13.9 \ 19.25

16.1 i 18.73

18 i 17.87

19.9 i 16.04

21.8 | 15.6

24.2 I 15.23

26 | 14.84

27.9 I 14.83

30.1 ) 14.72 ,.,.,.^^

40 ! 13.98

45.2 | 13.57

50.1 \ 13.36

54.8 i 13.16

60.1 | 13.07

65.2 ! 12.96

69.8 i 12.89

75.3 I 12.79

79.7 i 12.72

85 I 12.67

90 i 12.66

96.2 ! 12.64

99.1 ! 12.63

0.5 I 23.11

6.9 i 22.19

1 ! 22.24

2.1 \ 21.16

3 | 21

3.9 I 20.88

5 i 20.8

6 I 20.76

j I 2Qj

8 I 20.65

8.9 I 20.61

9.7 I 20.46

12.1 | 19.99

14 \ 19.84

15.6 | 19.16

16.2 i 18.91

8.57

8.57

8.57

8.57

8.57

8.57

8.57

8.57

8.56

8.56

8.55

8.54

8.52

8.49

8.41

8.39

8.36

8.33

8.33

8.31

___

8.25

8.22

8.2

8.19

8.18

8.16

8.14

8.12

8.08

8.06

8.04

8.03

8.02

8.53

8.54

8.54

8.54

8.54

8.55

8.55

8.55

8.55

8.55

8.56

8.55

8.54

8.53

8.52

8.51

951 i

951 ;

951

951

951

951

951

953

955

964

979

977

977

977

980

981

981

982

982

981 

980 "

980

982

983

983

984

987

989

992

997

1001

1003

1005

1008

947

950

948

945

946

950

952

952

953

953

953

956

962

964

\ 981

! 981

8.18 I 96.1

8.28 i 96.8

8.28 I 96.8

8.32 i 97.2

8.36 I 97.7

8.36 97.7

8.42 i 98.4

8.49 ! 98.9

8.48 I 98.6

8.6 \ 98.9

8.68 | 98.2

8.83 ! 99.2

8.89 j 98.9

9 98.4

9.03 95.1

9.08 ; 94.7

8.96 I 92.7

8.92 | 91.5

8.81 \ 90.4

8.78 I 89.8

__ _| _^^___

8.69 I 87.5

8.67 ; 86.5

8.6 I 85.4

8.62 i 85.2

8.49 | 83.7

8.4 i 82.7

8.22 i 80.7

8.1 | 79.4

7.91 I 77.4

7.74 I 75.7

7.51 i 73.4

7.39 I 72.3

7.38 ! 72.1 Q 22 | ggg

8.3 I 98.8

8.29 [ 98.8

8.4 I 98

8.43 I 98.1

8.45 I 98.1

8.46 i 98.1

8.49 i 98.3

8.48 1 98.2

8.55 1 98.8

8.45 

 

i 97.6 ^ _ 

8.56 1 97.7

8.57 I 97.5

8.69 i 97.6

8.75 | 97.7

203
M5 ;

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

18.3

19.9

24.8

30

35.3

40.1

45

50

55

59.5

65.2

70

75.2

80.3

84.7

90.2

95.1

99.4

0.5

1.13

4.87

9.8

12

12.9

14.5

16.1

18

18.9

20.1

22

24.2

26.2

2g

29.8

35.2

39.4

42.7

44.6

50.7

56.5

60.5

65.2

70

74.5

79.7

84.5

90.6

i 98.2

17.39

16.86

15.7

14.68

14.11

13.91

13.65

13.43

13.22

13.1

12.92

12.76

12.63

12.58

12.55

12.54

12.54

12.54

20.67

20.67

20.62

20.52

20.29

19.72

19.43

19.18

18.26

17.99

17.78

17.33

17.2

16.92

16.54

16.12

15.57

14.99

14.11

13.68

13.43

13.23

12.85

12.61

12.5

12.46

12.37

12.29

12.31

12.33

12.36

12.36

8.44

8.43

8.38

8.29

8.24

8.22

8.2

8.18 |

8.16

8.15 i

8.14

8.14

8.12

8.12

8.11

8.1

8.1

8.09

8.61

8.61

8.61

8.6

8.6

8.57

8.56

8.54

8.49

8.47

848

846

8.45

8.43

8.42

8.39

8.35

8.33 8 27

8.24

8.23

8.21

8.19

8.19

8.18

8.17

8.17

8.17

8.16

8.16

8.15

i 8.14

979

979

980

981

976

978

975

977

978

979

975

972

963

962

963

974

977

978

873

876

878

877

875

872

870

863

857

854

869

874

869

868

875

879

891

910

927

915

912

907

897

892

888

900

903

898

914

924

i 932

! 941

8.86 ;

8.86

8.95

8.77 !

8.57

8.41

8.4

8.28

8.22

8.04

8.02

8.03

7.91

7.84

7.73

7.56

7.49

7.47

7.32

7.35

7.35

7.39

7.43

7.54

7.61

7.67

7.78

7.8

7.83

7.88

7.94

7.89

7.89

7.87

7.89

jjfi

7.71

7.66

7.66

7.65

7.61

7.62

7.6

7.54

7.58

7.49

7.43 .-....._____..._...

7.28

7.15

95.9

94.8

93.5

89.6

86.4

84.5

83.9

82.3

81.3

79.3

78.9

78.7

77.2

76.5

75.4

73.7

73

72.8

84.6

84.9

84.9

85.2

85.2

85.5

85.9

86

85.7

85.4

85.4

85.2

85.6

84.5

83.9

82.9

82.1

80.3

77.8

76.5

76.2

75.7

74.7

74.3

74

73.3

73.5

72.5

72

70.9

70.7

] 69.4

204
M7

M7

M7

M7

M7

M7

M7

M7 

M7

M7 

M7

M7 ___

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7 M7^""""

M7

M7

M7

M7

M7

M7

M7 .. _

______

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8 ..,._......,-..

0.7

2

4

5.9

6.9

8.9

10

12.1 _. __..,.,

14.1

14.8

15.7

16.9

18.1

19.9

22

24.1

26

27.9

30

35

40.2

44.8

49.7

55.1

61

65.6

70.2

75

79.8

85 _____

97.7

0.8

1.8

3.9

6.3

8

10

12.1

14.1

15.1

16.4

17.3

18.1

19.2

20.5

22.2 _... ,_.....,.

M8 i 26.1

20.63

20.57

20.35

19.37

18.88

18.71

18.58

18.24

 ^53 -

17.29

17.23 .____ . .

17.01

16.62

16.31

16.15

15.85

15.55

15.28

15

14.57

14.17

13.38

12.8

12.63

12.48

12.22

12.17

12.15

12.12

12.13

12.16

12.14

2^52

21.46

21.16

20.85

20.76

20.32

20.22

20.04

19.69

19.09

18.73

17.95

17.63

17.43

16.67 .....,,...,..__,.........,

15.89

8.47 ! 831

8.47 : 831

8.48 832

8.43 831

8.39 830

8.38

8.37

8.35 

8.29

8.28

8.28 .._._.. .

8.27

8.26

8.26

8.25

8.25

8.23

8.23 

8.21

8.19

8.15

8.13

8.12

8.12

8.11

8.1

8.1

8.09

8.09

8.09

8.08

8.54

8.54

8.55

8.55

8.55

8.53

8.52

8.5

8.48

8.44

8.4

8.34

g32

8.31

829

829

829

829

830

830 """""""""""830""""""""""""

831

836

844

845

851

856

865

870

885

885

874

861

858

858

859

864

865

862

868

869

877

832

832

833

834

833

834

833

833

831

832

829

817

8.17 ! 94.3

8.29

8.28

8.26

8.15

8.05

7.99

7.89

7.86

7.84

7.82

7.82

7.79

7.8

7.83

7.87

7.87

7.85

7.87

7.87

7 93

7.95

7.98

7.98

7.93

7.92

7.8

7.72

7.62

7.56

7.53

7.51

7.48

8.31

8.27

8.26

8.24

8.22

8.16

8.07

8.09

8.01

8.16

7.95

7.92

95.6

95.1

93

90.9

89.4

88.5

86.8

85.3

84.6

84.3

84.2

83.6

83.1

82.9

83

82.5

81.7

81.4

81

80.8

80.3

79.2

78.2

77.4

77.1

75.5

74.6

73.6

73

72.7

72.5

72.2

97.7

97.1

96.4

95.5

95.1

93.7

92.5

92.4

90.8

91.4

88.4

86.6

818 | 7.96 i 86.6

822 | 7.93 | 85.8

8.28 ! 833 i 7.92 I 84.4 "'""""""8. 27 """]"" """"838"' -"' ] " "" - ^-^ - - - ^- - - - Q4 

8.26 i 840 I 7.95 I 83.4

205
M8 

1

M8 j

M8 i

M8 \

M8

M8

M8

M8

M8

M8

M8

M8

M8

M9

M9

M9

M9

M9

M9

M9

M9

M9

M9

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M11

......._.__...,.,..^,......., ^^ ^

30 [ 14.84

35.2 I 14.07

40 \ 13.6

45.4 ! 13.14

499 | 1297

55.1 I 12.8

59.7 i 12.63

66.1 ! 12.4

69.9 i 12.24

75.1 I 12.13

79.8 I 12.08

80.5 I 12.1

0.8 \ 20.81

2.5 ( 20.73

3.7 1 19.43

4.7 \ 19.02

6.7 I 18.67

9 i 18.12

11.8 I 17.62

13.6 ! 17.16

16.2 i 16.3

17.8 | 15.81

0.6 I 21.05

1.8 [ 21.02

4 | 20.96

6.1 .1 20.93

8 j 20.9

10 I 20.9

^2 | 20.84

13.9 | 20.73

16 1 20.66

17.1 \ 20.64

18 I 20.58

18.9 j 18.97

20.1 i 18.36

22.1 I 16.51

25.7 i 15.57

29.9 1 15.11

349 j 149-j

39.7 i 14.64

44.7 I 13.86

49.4 i 13.77

54.7 j 13.62

59.7 1 13.53

63.8 13.33

69.6 13.28

76.5 13.27

77.3 13.27

I 1 21.76

8.25 844 \

8.22 851

8.18 862

8.16 868

8.13 i 859

8.12 s 857

8.12 ! 856

8.11 1 855

8.11 j 855

8.12 | 854

8.11 I 854

8.1 ( 855

8.06 | 856

8.47 | 816

8.46 ) 816

8.44 | 813

8.42 81 1

8.4 I 810

8.34 1 810

8.26 f 814

8.17 i 822

8.02 | 835

7.9 | 842

8.59 j 973

8.59 \ 973

8.59 \ 975

8.59 | 975

8.59 | 976

8.59 \ 976

8.59 i 976

8.59 | 976

8.58 | 977

8.58 j 977

8.58 | 977

8.52 ! 984

8.5 | 983

8.43 i 994

8.4 i 994

8.35 j 994

8.33 i 994

8.3 | 995

8.24 i 991

8.23 1 990

8.21 | 989

8.21 I 988

8.2 | 985

8.19 | 985

8.19 | 985

8.19 j 985

8.59 ! 991

8 ;

8.06 1

8.05

8.05

8.09

8.06

7.95

7.86

7.79

7.72

7.64

7.53

7.468

8.07

8.31

8.3

8.29

8.29

7.98

7.4

6.71

6.01

7.88

7.89

7.91

794

7.96

7.978

8.06

8.07

8.06

8.04

8.26

8.32

8.48

8.15

8.05

7.95

7.9

7.74

7.68

7.66

7.6

I 7.5 r ............ __ .._ .._-

) 7.49

j 7.42

< 7.55

83.2

82.6

81.1

80.3

79.9

79.3

77.9

76.7

75.7

74.7

73.7

72.6

71.9

92.8

93.4

93.7

g2g

92.1

91.1

86.7

79.6

71

62.9

91.8

91.9

92

92.3

92.5

92.6

92.9

93.3

93.2

93.1

92.8

92.3

91.9

90.1

84.9

83

81.6

80.7

77.7

76.9

76.5

75.8

74.5

74.5

74.2

73.5

! 89.2

206
Mil

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11 

Mil

M11

M11

M11

M11

M11

M11

M11

 27|"""-""-"

3.2

4.3

5.1

6.2

6.9

8.2

9

10.4

12

13.2

15

17.1

19

20.2

21 "22.4""""""'

24

25.2

27.2

30.3

35.1

40.8

41.9

21.74

2i 74

21.74

21.74

21.74

21.72

21.72

21.72

21.72

21.71

21.69

21.69

21.61

20.62

20.22

19.52 

19:05

17.46

16.46

15.78

15.12

14.64

14.12

14.07

8.59

8.59

8.59

8.59

8.59

8.59

8.59

8.59

8.59

8.59

8.59

8.59

8.58

8.54

8.53

8.51 

8.49

84

8.35

8.31

8.28

8.22

8.11

8.1

992

991

992

992

991

993

992

992

992

992

992

993

993

994

996

1002 

1005

1020

1027

1031

1021

1018

1012

1010

"""""""""""""7759""""" """""""

7.65

7.66

7.67

7.69

7.69

7.71

7.74

7.73

7.78

7.78

7.81

7.82

7.88

7.89

7.99

aw

8.02

8.12

7.89

7.85

7.61

7.18

7.14

 - Qg;g --- 

90.3

90.4

90.5

90.8

90.8

91

91.4

91.3

91.8

91.8

92.1

92.2

91.1

90.5

90.3 '"'""""'""""'"""""""90"""""""""'""""""""""""

86.9

86.2

82.5

81

77.8

72.5

72

207
Table d. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for August 

1996.

Station Depth Temperature pH 

_______(m) (Centigrade)_____

Conductance Dissolved Oxygen Dissolved Oxygen 

(us/cm)_____(mg/L)_____(%saturation)

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

Ml

M1

M1

M1

M1

M1

M1

M1

M2

M2

M2

M2 .__.__

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M3

M3

M3

M3

M3

1.6

3.4

5.9

7.6

9.5

12.4 

15.6

17.4

20.3

25

26.4

30.8

36.7

40.8

45.7

50.7

55.7

60.8

66.1

70.6

80.3

89.1

98.2

1.4

4

5.8

8 __....

12.5

14.9

17

19.7

22.6

25.8

30.7

35.5

40.9

45.4

1.9

_..2J__

3.8

4.8

5.8

28.36

28.15

27.64

27.45

27.28

27.21

27.1

27.05

26.26

24.18

19.83

19.49

18.06

16.8

15.49

|477

14.31

13.84

13.56

13.39

13.25

13.04

13

12.87

30.42

29.61

29.44

29.39 --27j5 -

27.56

26.96

25.85

23.68

21.99

20.33

18.28

17.11

15.96

15.33

29.87

29.44

29.26

29.17

; 29.06

8.36

8.37

8.38

8.39

8.37

8.36

8.35

8.33

8.23

8.09

7.95

7.93

7.89

7.87

7.87

7.87

7.88

7.88

7.88

7.89

7.89

7.87

7.86

7.84

8.52

8.59

8.55

8.56 "sirs'" """

8.24

8.03

7.93

7.88

7.8

7.72

7.68

7.65

7.66

7.65

8.43

8.43

8.44

8.44

8.45

1025

1028

1032

1032

1032

1033

1033

1033

1031

1023

1029

1030

1041

1048

1025

1022

1021

1023

1023

1022

1023

1027

1032

1039

1059

1081

1082

1092 

1049

1062

1121

1103

1038

1028

1050

1074

1078

1076

1076

1010

1009

1010

1011

1015

8.7

8.85

9.03

9.09

8.97

8.93

8.79

8.64

7.9

7.03

6.29

6.21

6.13

5.93

6.31

6.57

6.81

6.91

6.97

7.04

7.08

6.99

6.76

6.48

9.87

10.63

10.31

10.52 .......................,., ._.......,...._.,.........

7.78

5.97

5.22

4.86

4.06

3.03

2.52

2.64

3.25

3.33

8.71

8.92

9

! 9.01

! 9.09

114.6

116

117.3

117.7

115.9

115.1

113.1

111.1

100.2

85.8

70.5

69.2

66.4

62.5

64.7

66.3

68.1

68.4

68.6

69

69.2

68

65.7

62.8

134.7

143

138.3

141 '''^''"''"''"''''''''"l''fOJ''^'''^^^"'''''^'''

101

76.7

65.7

58.8

47.6

34.3

27.4

28

33.7

34.1

117.8

119.6

120.4

120.3

121.1

208
M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3 ,................__..........

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

6.8

7.8

9

9.9

10.9

11.8

12.8

13.7

14.8

15.7

16.8

17.8

18.8

19.9

21

22.9 

24.8

27.1

29.2

31.2

35.7

40.6

45.7

52

55.6

60.8

66.1

76.4

87.8

98.4

1.4

2_g

4.8

6.8

8.7

10.7

12.6

15

16

16.8

17.9

18.7

20.9

22.6

24.9

27

30.8

35.7

40.7

46.4

28.98 i

28.9 |

28.78 I

28.63 I

28.46 i

27.88 i

27.39

27.16

26.95

26.48

25.38

24.93

22.93

22.59

21.73

20.42 

19.84

19.35

18.38

1784

16.48

15.49

14.71

14

13.85

13.58

13.32

13.07

12.93

12.84

29.35

29.28

29.18

29.1

29

28.86

28.31

27.43

26.51

24.95

23.07

22.55

21.67

20.79

19.96

19.19

17.76

16.47

15.52

! 14.6

8.45 i

8.45 i

8.45

8.45

8.43

8.39

8.36

8.33

8.31

8.28

8.19

8.16

8.06

8.04

8.01

8 ........ ^.......... ..........

7.96

794

7.9

7.88

7.9

7.9

7.91

7.92

7.92

7.92

7.91

7.88

7.86

8.44

8.44

8.45

8.44

8.44

8.43

8.42

8.38

8.32

8.25

8.16

8.12

8.07

8.04

8.01

8

7.98

7.96

7.96

7.96

1016

1018

1023

1029

1027

1026

1025

1024

1025

1029

^QQy

1001

963

944

942

944 

952

987

1006

1022

1040

1012

1009

1005

1003

1004

1001

1007

1020

1026

972

973

974

968

971

974

997

1005

993

918

851

839

830

842

863

886

941

976

987

999

9.1

9.11

9.18

9.19

9.2

9.09

8.92

8.71

8.52

7.94 

 

7.36

6.98

7

6.79

6.73 

6.63

6.55

6.46

6.1

6.02

6.51

6.78

7.06

7.22

7.29

7.27

7.32

7.15

6.66

8.82

8.9

8.97

9.04

9.16

9.22

9.51

9.17

8.54 __ _____.

7.65

7.52

7.2

7.02

6.83

6.69

6.66

6.74

7.02

7.14

121.1

121

121.7

121.6

121.4

118.6

115.4

112.3

109.4

101.1

94.9

91

83.2

82.9

79.1

76.4 .....,.......,......,,..._,^..... ..........................

72.8

70.4

65.7

63

66.8

68.4

70.1

71.5

71.7

71.2

71.2

69.4

645

118.1

119.1

119.8

:j2o.6

122

122.5

125

118.8

108.8

100.2

91.3

88.9

83.8

80.2

76.8

74^

71.7

70.6

72

71.9

209
M4 ;

M4

M4 I

 $4 ]

M4

M4

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5 ___

M5

M5

M5

M5

M5

M5

M5

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

51.4 i

55.7

60.5 

TOT

81.9

98.7

1.3

3.8

6.8

8.7

10.8

12.9

15.6

17.8

20.7

24.9

30.5

36.6

40.6

456

51.1 

56

61.5

67.2

72.4

76.5

81.4

90.2

gg_2

1.8

2.9

3.8

4.8

5.8

6.9

7.8

8.8

9.7

10.8

11.8

12.8

13.8

14.8

15.8

16.8

17.9

18.8

19.9

20.8

I 22.8

14.16

13.95 I

13.61 .........,_ __.... .................

12.96

12.79

2939

29.23

28.77

28.66

^gg

27.21

25.66

22.91

21.45

19.96 _45

16.11

14.93

1442

14.16 

__

13.57

13.33

13.14

12.98

12.89

12.77

12.74

29.1

28.89

28.79

28.73

28.67

28.63

28.59

28.1

27.76

27.1 2g_

25.51

24

23.6

22.86

22.47

21.96

21.55

21.13

i 21.07

! 20.85

7.96 !

7.96

7.96 ; 

7.96

7.95

7.92

8.45

8.46

8.46

8.45

8.41

8.39

8.31

8.16

8.07

8.03

8

7.98

7.97

7.96

7.96 _____

7.95

7.96

7.97

7.97

7.97

7.95

7.94

8.46

8.46

8.47

8.47

8.47

8.47

8.47

8.45

8.44

8.41

8.39

8.3

8.2

8.18

8.16

8.14

8.12 _____......

8.09

8.08

8.08

1000 I

998 |

999 

992

994

1009

941

941

940

941

960

950

890

824

804

858

906

978

997

999

996

__ __

991

989

981

971

967

981

995

909

910

911

910

909

909

909

919

930

919

921

849

805

802

794

792

789

790

791

792

i 793

7.26 \ 72.4

7.32 § 72.7

7.38 ! 72.7 »......,.,.,.......^ ... .,.

7.41 | 71.9

6.93 i 67

8.4 I 112.6

8.56 ( 114.4

8.76 I 116.1

8.67 i 114.7

8.59 | 111.7

8.44 I 108.8

8.17 I 102.4

7.55 89.9

7.01 i 81.2

6.75 \ 75.9

6.61 i 72.1

6.72 I 69.8

6.79 ! 68.9

6.85 ! 68.6

__ 

7.16 1 71.4 _j «_g__m __ .

6.96 I 68.5

7.23 ; 70.7

7.33 1 71.4

7.4 j 71.9

7.41 I 71.8

7.27 i 70.3

7.16 i 69.2

8.71 I 116.1

8.81 ! 117

8.85 i 117.3

8.86 I 117.3

8.88 I 117.5

8.86 I 117.1

8.86 I 117

8.89 j 116.5

8.97 I 116.9

8.82 I 113.6

8.65 ( 110.4

8.42 \ 105.2

7.87 i 95.6

7.76 | 93.6

7.72 I 91.8

7.67 i 90.6

7.56 | 88.4

7.5 I 86.9

7.46 j 85.8

7.39 ! 85

7.35 | 84.2

210
M6 

]

M6 I

M6 !

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

24.8 1

26.9

28.8

30.7

35.8

40.7

45.8

50.9

55.9

60.7

65.8

70.9

75.7

80.9

85.8

90.8

95.7

99.8

0.9

2.23

4.1

5.87

8.39

10.1

11.1

12.1

13.1

14.9

16

17

18.2

19.6

21.9

24.4

26.3

28.7

30.1

35.1

39

44.8

51.5

56.5

^_2

66.9

70.1

75.7

86

2071"

18.97

18.04

17.25

15.88

15.05

14.45

13.99

13.65

13.24

^2g2

12.77

12.64

12.58

12.53

12.54

12.54

12.56

28.77

28.71

28.6

28.42

28.36

27.86

27.43

27.15

26.69

26.42

25.65

2455

22.7

2229

22.22

21.65

21.51

21.14

20.73

; 19.04

17.74

16.76

14.9

14.34

13.8

13.4

13.14

12.92

12.77

12.72

12.58

12.48

ads

7.99 i

7.97 !

7.96

7.95

7.96

7.97

7.97

7.99

7.98

7.98

7.98

7.97

7.96

7.95

7.94

7.94

7.94

8.46

8.47

8.46

8.46

8.46

8.45

8.43

8.41

8.39

8.37

8.36

8.3

8.18

8.15

8.13

8.13

8.12

8.11

8.09

8.01

7.96

7.94

7.96

7.97

7.97

7.97

7.96

7.96

7.95

794

7.93

i 7.9

806

844

880

909

945

954

957

946

932

917

910

904

908

914

924

948

958

964

881

882

884

886

887

880

872

865

851

845

820

798

790

787

786

786

786

786

790

816

863

894

909

899

887

882

878

878

879

881

887

! 895

6.72 I

6.47

6.36

6.42

6.51

6.87

7.04

7.29

7.52

7.56

7.56

7.52

7.4

7.27

7.22

6.99

6.86

6.82

8.92

8.89

8.86

8.94

8.98

9.12

9.08

8.96

8.81

8.71

8.63

Q32

7.8

7.71

7.65

7.65

7.65

7.66

7.55

6.76

6.41

6.45

7.06

7.36

7.51

7.57

7.53

7.44

7.24

i 7.06

i 6.75

i 6.4

........................ ...^.._...........................

71.3

68.8

68.3

67.4

69.8

70.6

72.4

74.1

73.8

73.3

72.7

71.3

70

69.4

67.2

65.9

65.6

118.2

117.7

117

117.7

118.1

118.9

117.5

115.4

112.5

110.6

108.1

102.1

92.5

90.7

89.9

89

88.6

88.1

86.2

74.6

68.9

67.9

71.5

73.6

74.3

74.2 .. ...... ^^.^^^

72.1

70

68.1

65

i 61.5

211
 " - -- -^y-"" "~1

M8 !

M8 j

M8 i

M8 ;

M8 |

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8 

M8

M8

M8

MS

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M9

M9

M9

M9

M9

M9

M9

M9

M9

M9

M10

M10

M10

96.3 |

1 |

2.1

3

4

5

6

7.1

8

9

10

11

12

13

14

14.9 ""'""""16"""""""""""""

16.9

17.9

19

20.1

22.1

24.1 _

27.9

29.8

34.7

40.5

44.5

50.2

54.9

59.9

65.4

70.2

75.5

81

83.2

0.9

1.6

2.8

4.3

5.9

6.9

7.2

9.6

12.5

14.4

1.1

i 2.7

! 4.9

12.5

28.64

28.65

28.64

28.62

28.58

28.56

28.52

28.42

28.12

27.61

26.05

25.2

24.79

24.01

23.46 .., ,___,__,..

22.69

22.48

22.3

22.11

21.79

21.31

20.29

19.92

18.66

15.43

14.31

13.79

13.47

13.2

12j7

12.69

12.56

12.48

12.4

12.39

2Q_i8

28.18

28.16

27.71

20.59

20.14

20.12

19.75

19.7

I 19.63

S 29.59

I 29.57

! 29.53

7.89 ;

8.51

8.51

8.51

8.52

8.52

8.52

8.52

8.51

8.5

8.49

8.45

8.42

8.39

8.3

8.25 

.......__

82

8.18

8.18

8.18

8.16

8.14

8.09

8.05

7.98

7.96

7.97

7.96

7.95

7.94

7.93

7.92

7.91

7.91

7.88

7.84

8.52

8.52

8.52

8.51

8.13

8.07

8.05

8.01

8

7.96

8.45

8.46

i 8.46

903 i

842

846

846

847

846

845

843

845

845

831

813

806

805

796

794 """"""794""'""""'"""'"""""

791

789

790

789

787

786

791

796

810

880

886

873

871

869

868

868

870

871

876

882

799

801

801

799

795

794

793

796

797

806

\ 944

! 944

! 945

6.23

9.24

9.34

9.37

9.42

9.45

9.47

9.52

9.53

9.58

9.61

9.33

9.25

9.12

8.34

8.18 

8718

8.07

7.96

8

8.04

7.99

7.89

7.51

7.2

6.67

7.1

7.45

7.34

7.22

7.15

7.18

6.75

6.73

6.8

6.32

5.2

9.4

9.43

9.5

9.65

8.04

7.71

7.49

7.39

7.25

6.91

8.49

8.59

8.61

59.8

122.1

123.5

123.9

124.5

124.8

125

125.6

125.5

125.5

124.7

117.8

114.9

112.5

101.4

98.4 """""""""""""""""""""9"7.3""""""""""""""""""""""

95.7

94

94.1

94.2

93.1

91.1

85

80.9

73.1

72.7

74.5

72.5

70.9

69.8

69.5

65.1

64.7

65.3

60.5

49.8

123.3

123.6

124.6

125.5

91.5

87

84.5

82.7

81.1

77.2

114.2

115.5

115.7

212
MIO :

M10 i

M10 !

M10 i

M10 f

M10

M10

M10

M10

M10

M10

M10

MIO

M10

M10

M10

M10

M11

M11

Mil

Mil

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

6.9 |

8.9

10.8

13

14.8

16.1

19.3

21.8

25.3

28.1

33.5

42

50.7

60.2

72.3

80.2

96.6

2.2

3.6

6

O

10.2

11.9

13.5

16.2

17.1

17.9

18.9

19.8

21.1

22

24.8

27.9

30.5

35.9

41

41.5

29.13

28.94

28.75

28.25

27.62

26.12

22.83

21.32

19.77

18.52

16.43

14.69

13.95

13.6

13.33

13.06

12.76

29.14

29.14

29.14

29.14

29.14

29.12

28.61

28.28

27.73

2g_Q2

23.36

22.63

22.03

21.4

20.19

18.86

18.02

16.24

15.25

! 15.19

8.46

8.46

8.45

8.43

8.39

8.3

8.12

8.06

8.01

7.97

7.94

7.91

7.89

7.88

7.88

7.9

7.91

8.43

8.43

8.43

8.43

8.43

8.42

8.31

8.25

8.12

8.04

8.05

8.03

7.98

7.93

7.94

7.91 

 ____

7.85

7.76

7.74

941

938

937

939

929

903

845

866

906

930

973

995

996

994

988

983

980

974

978

981

981

982

983

986

985

982

930

897

896

908

926

944

973

988

1015

1027

1027

8.78

8.85

8.93

8.85

8.66

8.21

7.44

7.11

6.73

6.42

6.38

6.42

6.44

6.42

6.57

6.84

7

8.2

g_2i

8.2

8.2

8.2

8.04

7.28

___§J3____

5.84

6.19

6.78

6.59

6.14

5.43

5.95

5.71

5.55

5.08

2.73

I 2.55

117.1

117.7

118.4

116.3

112.5

103.8

88.5

82.1

75.4

70.2

66.8

64.7

63.9

63.2

64.3

66.6

67.7

109.5

109.5

109.4

109.4

109.5

107.3

96.3

89.8

76

76.7

81.4

78

^ _g

62.8

67.2

62.8

60

52.9

27.9

26

213
Table e. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for November 

1996.

Station Depth Temperature pH 

_______(m) (Centigrade)____

Conductance Dissolved Oxygen Dissolved Oxygen 

(us/cm)_____(mg/L)_____(%saturation)

M1

M1

M1

M1 

Ml

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

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8.07

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7.83

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90.7

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89.8

89.7

89.7

89.5

! 89.3

214
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M3

M3

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j 61.3

215
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M4

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8.51 .......................... £.^.........,... ...............

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216
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M6

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26.1 i 17.4

27.9 17.39

29.9 17.37

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65 i 13.79

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28 i 17.35

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40 i 157

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80 I 12.67

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859

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8.33

8.32

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217
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14

16

18

20

22

24

26

28

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8.17

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8.18

8.18

8.18

8.18

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8.17

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818 I

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819

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778

776

775

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875

875

877

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8.63

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8.6

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95.4

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91.9

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218
M10 i 35.7 !

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M10 1 51.8

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7.71

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937

930

928

928

927 

928

929

929

929

935

937

937

938

938

938

939

946

959

953

8.45

8.36

8.06

6.25

5.62

5.43

5.44

547

5.55

5.59

5.68

5.7

8.65

8.64

8.63

8.6 

8.57

8.56

8.53

8.51

8.5

8.48

8.48

8.47

8.47

8.46

8.43

8.42

8.6

8.6

91.3

90.2

83.7

64.2

57.3

55

55

54.9

55.4

55.7

56.5

56.7

93.9

93.2

93

92.6 ........ _,_........,......., ,..,

92.1

91.7

91.6

91.4

91.3

91.2

91.1

91.1

91

90.6

90.4

91.2

91.1

219
Table f. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for January 

1997.

Station Depth Temperature pH 

_______(m) (Centigrade)____

Conductance Dissolved Oxygen Dissolved Oxygen 

(us/cm)_____(mg/L)_____(%saturation)

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M3

1.2

3

6.2

9.9

14.9

19.4

24.7

30.5

35.4

39.7

45.4

50.7

55

60.6

65.8

69.9

76.5

86.1

98.4

1.6

3.2

5

7.1

9.1

11

13

15.1

16.9

18.8

21

24

2g

28

30.2

32.2

34.5

36.4

39

41.8

44.5

47

49.1

| 49.6

i 1.3

13.25

13.24

13.1

13.04

12.98

12.97

12.94

12.94

12.94

12.93

12.92

=12.91

12.91

12.91

12.91

12.91 

12.91

12.9

13.42

13.37

13.08

13Q4

13

12.99

12.98

12.98

12.94

12.94

12.93

12.93

12.92

12.93

12.93

12.93

12.91

12.91

12.91

12.91

12.93

13.24

14.2

14.21

13.84

8.14

8.14

8.13

8.13

8.09

8.08

8.07

8.07

8.07

8.06

8.06

8.06

8.05

8.05

8.05

8.05

8.04

8.04

8.04

8.15

8.15

8.16

8.15

8.15

8.15

8.15

8.15

8.14

8.13

8.13

8.13

8.13

8.12

8.12

8.12

8.12

8.12

8.12

8.12

8.12

8.08

7.98

7.97

8.14

975 |

976

977

978

978

978

978

979

979

979

979

980

980

980

980

980

981

982

982

968

985

986

985

985

984

§84

984

984

984

985

984

985

985

985

985

986

986

986

986

988

1083

1386

1393

952

8.4 j 87.3

8.44 | 87.7

8.43 I 87.4

8.41 I 87.1

8.25 | 85.3

8.09 ! 83.6

8.01 82.7

7.96 ! 82.2

7.95 I 82.1

7.93 I 81.9

7.89 I 81.5

7.87 I 81.2

7.85 | 81.1

7.81 I 80.6

7.78 \ 80.2

7.77 I 80.2

7.74 | 79.9

7.69 ] 79.4

7.66 j 79

8.65 I 90.3

8.67 I 90.4

8.66 J 89.7

8.65 I 89.5

8.65 I 89.4

8.64 I 89.3

8.6 i 88.9

8.61 | 89

8.57 I 88.6

8.53 i 88

8.51 J 87.8

8.48 ! 87.5

8.47 i 87.4

8.43 | 87

8.42 ! 86.9

8.42 \ 86.9

8.41 I 86.8

8.4 ! 86.7

8.39 i 86.6

8.38 i 86.5

8.36 i 86.4

8.16 | 84.9

7.8 ! 82.9

7.48 | 79.6

8.42 \ 88.7

220
M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M5

M5

M5

M5

M5

2.1 i

4.1 !

6.2 !

8.1

10.3

12.4

14.9

20

25

30.1

35

40.3

45.1

50.3

54.9

60.1

64.9

69.8

75

79.8

86.9

92.9

98.7

1.7

3.86

8.1

11.8

14.9

20

24.9

29.9

35.2

40.3

45.2

50.1

54.9

59.8

65.6

69.3

75.4

80.1

85.1

90.2

98.3

0.9

2.2

4.4

6.7

8.3

13.33

13.08

13.05

13.02

13.02

13.01

13.01

12.99

12.98

12.91

12.91

12.91

12.91

12.88

12.88

12.88

12.86

12g8

12.86

12.84

12.79

12.66

12.53

13.27

12.92

12.89

12.87

12.86

12.86

12.86

12.86

12.85

12.82

12.63

12.6

12.53

12.5

12.47

12.43

12.42

12.4

12.38

12.32

12.24

12.1

12.94

12.92

12 g

12.83

12.78

8.14 I 959

8.14 i 960

8.14 1 961

8.13 i 962

8.12 I 962

8.12 \ 962

8.11 i 963

8.1 I 963

8.08 \ 964

8.05 966

8.04 967

8.03 968

8.03 970

8.03 972

8.03 974

8.03 974

8.03 I 974

8.04 : 977

8.03 I 977

8.04 975

8.04 970

8.04 951

8.06 935

8.16 931

8.15 937

8.15 938

8.14 938

8.1 2 938

8.12 939

8.12 939

8.12 ; 940

8.12 j 940

8.08 i 945

8.1 1 926

8.11 I 922

8.12 ; 916

8.14 ! 913

8.14 | 913

8.16 I 912

8.16 i 911

8.16 i 911

8.16 | 911

8.17 I 911

8.17 | 912

8.18 | 915

8.21 I 898

8.21 l 900

g_2i ; 903

8.21 | 905

i 8.21 1 906

8.44

8.5

8.44

8.4

8.34

8.29

8.27

8.18

8.02

7.71

7.64

7.63

7.62

7.56

7.56

7.57

7.55

7.62

7.6

7.61

7.58

7.53

7.58

8.54

8.23

8.07

8.04

7.99

7.958

7.97

7.97

7.71

7.77

 ,.

7.9

8.03

8.07

8.2

8.25

8.26

8.26

8.28

8.3

8.33

8.96

8.95

8.96

8.96

8.95

87.9

88.1

87.4

86.9

86.3

85.7

85.5

84.6

82.9

79.5

78.8

78.7

78.7

78

77.9

78

77.9

78.6

78.3

78.4

78.1

77.2

77.5

88.9

85

83.2

82.9

82.3

81.9

82.4

82.2

82.1

79.4

79.7

80

80.9

82.1

82.4

83.7

84.2

84.3

84.2

84.3

84.3

84.4

92.5

92.4

92.5

92.3

i 92.1

221
M5 i

M5 i

M5 I

M5 I

M5 I

M5 j

M5 |

M5 I

M5 )

M5 !

M5 |

M5

M5

M5

M5

M5

M5

M5

M5

M5

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M7

M7

M7

10.1 !

__. 

12.7 I

18.2

21.2

24.8

30

35.2

40.3

45.1

50

55.5

60

65.1

70.3

75.9

79.8

85.1

91.8

98.5

0.9

2.1

4.4

6.4

9.4

10.9

12.7

15.4

15.8

18.4

19.9

25.4

30.6

35.9

40.8

45.4

51

56.5

60.1

65.2

70.2

76.7

81.7

85.8

90.2

96.5

98.1

1.1

1.7

4.6

12.71

12.6

12.57

12.56

12.55

12.53

12.53

12.52

12.52

12.52

12.5

12.47

12.43

12.35

12.15

11.88

11.81

11.76

11.63

11.68

12.88

12J

12.88

12.83

12.64

12.55

12.5

1248

12.48

12.48

12.47

12.45

12.34

12.33

12.32

12.27

12.09

11.96

11.92

11.86

11.76

11.6

11.42

11

10.93

10.91

10.91

12.99

12.98

I 12.94

8.21 \

8.19 I

8.18 ;

8.17 \

8.16

8.16

8.15

8.15

8.15

8.15

8.15

8.15

8.14

8.15

8.15

8.16

8.17

8.17

8.17

8.18

8.18

8.17

8.17

8.17

8.16

8.15

8.14

8.14

8.14

8.14

8.13

8.12

8.11

8.11

8.11

8.11

8.12

8.12

8.13

8.13

8.14

8.14

8.15

8.15

8.15

8.15

8.2

8.2

I 8.2

906 |

907

908

908

908

908

908

908

908

909

909

909

909

909

909

888

882

876

862

875

861

863

866

867

868

867

865

867

869

870

871

870

862

870

877

878

858

843

842

839

830

811

799

777

775

775

775

829

845

! 847

8.94 i

8.81 j

8.73

8.68

8.62

8.58

8.55

8.54

8.53

8.52

8.51

8.47

8.41

8.4

8.43

8.52

8.54

8.54

8.56

8.56

8.91

8.9

8.91

8.9

8.93

8.89

8.81

8.72

8.64

8.63

8.62

8.57

8.53

8.39

8.34

8.32

8.36

8.38

8.43

8.46

8.48

8.52

8.56

8.64

8.76

8.84

8.85

9.04

9.04

9.04

91.8

90.2

89.4

88.8

88.2

87.8

87.4

87.3

87.2

87.1

87

86.6

85.8

85.6

85.5

85.9

85.9

85.9

85.8

85.9

91.8

91.8

91.8

91.7

91.6

91

90.1

89.1

88.3

88.1

88

87.5

86.9

85.5

85

84.7

84.6

84.6

85.1

85.2

85.2

85.3

85.4

85.4

86.3

87.1

87.2

93.4

93.4

93.3

222
M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7 

M7

M7

M7

M7

M7

M7

M7

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M9

M9

M9

. ..__ .....,.............

9.1

10.9

13.3

14.5

16.7

18.4

20.1

25

30

34.1

40

45.9

50.8

55.4

61.9 

65:T

70.4

76.5

81.1

85.5

90.4

95.7

1

2.8

4.1

6

8.2

10.7

13.2

14.1

16.2

18.8

21.8

26.4

30.1

35.8

40.5

45.5

50.5

55.2

60.1

; 65.6

I 70.4

I 75.5

80.5

83

1

2.7

4.4

"""""12.86"" """""I

12.63

12.59

12.52

12.5

12.48

12.42

12.35

12.29

12.25

12.21

12.1

12.01

11.89

11.84

11.6 

1148

11.34

11.16

11.05

10.98

10.92

10.89

13.46

13.09

12.81

12.52

12.34

12.29

12.22

12.2

12.18

12.16

12.15

12.08

12.1

12.03

11.77

11.66

11.42

11.09

10.97

10.84

10.76

10.68

10.63

10.58

12.55

11.64

10.94

8^2 846 ""]

8.2 847

8.19 848

8.17 848

8.16 848

8.16 848

8.15 846

8. 13 846

8.12 844

8.12 843

8.11 841

8.11 836

8.12 \ 827

8.13 820

8.13 816

8.16 ; 800 

8716 f 793

8.17 i 787

8.17 | 780

8.17 j 777

8.16 i 775

8.16 | 772

8.16 I 771

8.3 i 800

8.31 I 807

8.31 ! 808

8.3 ; 808

8.28 I 808

8.26 j 809

8.25 ! 808

8.24 I 807

8.24 ! 807

8.24 \ 806

8.23 i 807

8.23 i 805

8.22 i 812

8.2 : 812

8.22 ! 795

8.21 I 792

8.21 I 777

8.2 i 755

8.18 ! 762

8.18 j 761

8.17 i 757

8.17 ! 757

8.17 | 759

8.15 ! 764

8.23 ! 730

8.24 ! 733

8.24 i 733

9.03 |

9.04 ;

9 i

8.99

8.79

8.73

8.69

8.56

8.38

8.36

8.34

8.35

8.37

8.39 i

8.44

8.52 

....... ............ _74.. ............ .^

8.81

8.94

8.93

8.94

8.96

8.97

9.26

9.33

9.29

9.33

9.25

9.07

9.03

8.9

8.88

8.84

8.83

8.82

8.74

8.72

8.71

8.8

8.9

9.03

9.17

9.1

9.09

9.1

9.09

8.9

9.88

10.06

10.07

93

92.7

92.2

91.9

89.8

89.2

88.7

87.2

85.3

84.9

84.7

84.6

84.6

84.6

85

85.3 87. 3 """"""""""""

87.7

88.6

88.3

88.2

88.3

88.4

96.7

96.6

95.6

95.4

94.2

92.2

91.6

90.4

90.1

89.6

89.5

89.3

88.6

88.1

87.5

88.2

88.7

89.3

90.5

89.5

89.3

89.2

89

87

101.1

100.8

99.3

223
M9 1

M9 !

M9

M9

M9

M9

M9

M10

M10

M10

M10

M10

M10

Ml 6

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

6.3 I

8.6

10.1

12

13.9

16.4

18.1

1.1

1.94

6.4

8.3

10.6

12.6

14.4

16.5

18.6

21.6

25.7

30.3

35.8

41

45.4

51.6

54.9

61

65.3

71.4

76.7

80.8

85.8

90.9

95.7

1.1

2.6

4.2

6.5

8.6

9.3

12.7

14.5

16.5

18.7

20.5

25.2

30.9

35.3

41.4

i 43.5

10.63 I

10.55 j

10.41 j

10.17

10.09

9.93

9.88

12.45

12.45

12.43

12.43

12.43

12.43

12.42

12.42

12.43

12.43

12.43

12.42

12.42

12.35

12.28

12.27

12.19

12.01

11.97

11.96

11.91

11.85

11.84

11.79

^74

11.73

12.05

.J2Q7

12.06

12.09

12.07

12.08

12.05

12.03

12.01

11.87

11.81

11.75

11.71

11.7

^ g~7

11.66

8.23 !

8.19 !

8.19

8.18

8.17

8.16

8.15

8.25

8.25

8.25

8.25

8.25

8.25

8.25

8.25

8.25

8.25

8.25

8.24

8.21

g^

8.22

8.22

8.23

8.24

8.24

8.24

8.25

8.25

8.25

8.25

8.25

8.25

8.3

8.3

8.3

8.3

8.3

8.3

8.3

8.3

8.29

8.29

8.28

8.27

8.27

8.26

8.24

8.2

736

734

736

741

746

749

746

895

898

897

898

898

898

899

898

898

898

899

899

907

905

903

904

906

912

914

914

916

919

919

921

923

924

914

916

917

918

918

918

917

917

918

921

923

924

924

925

956

1037

10.02 i

9.81 i

9.72

9.59

9.54

9.49

9.26

8.76

8.77

8.77

8.76

8.76

8.76

8.76

8.75

8.75

8.74

8.74

8.73

8.59

8.48

8.51

8.53

8.55

8.68

8.72

8.74

8.74

8.74

8.75

8.75

8.76

8.76

9.15

9.14

9.16

9.17

9.18

; 9.18

9.18

9.16

9.15

9.15

9.1

9.02

8.97

8.9

8.88

8.46

98.1

95.8

94.7

92.9

92.2

91.4

89.1

89.5

89.5

89.5

89.4

89.4

89.4

89.4

89.3

89.3

89.3

89.2

89.1

87.7

86.4

86.6

86.8

86.8

87.8

88.1

88.3

88.2

88

88.1

88

88

88

92.6

92.5

92.8

92.9

93

92.9

92.9

92.7

92.5

92.2

91.6

90.6

90.1

89.4

89.2

84.9

224
Table g. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for May 1997.

Station Depth Temperature pH Conductance 

_______(m) (Centigrade)________(us/cm)

Dissolved Oxygen Dissolved Oxygen 

___(mg/L)_____(%satu ration)

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M3

M3

M3

M3

1.0 I ____.._

10.5

15.3

20.2

25.2

31.6

34.9

40.0

45.3

51.0

54.6

59.9

64.7

70.4

75.4

79.7

85.1

90.2

95.3

98.7

2.4

5.1

7.6

9.5

11.8

 

17.1

19.4

21.3

24.8

28.1

31.3

33.2

36.2

39.0

43.7

48.2

! 51.5

I 521

I 52.1

! 1.1

i 5.1

I 9.8

i 15.1

18.63 i

17.93 I

17.15 !

16.48

15.61

14.49

13.67

13.56

13.11

12.85

12.51

12.44

12.41 , 

12.27

^4

12.10

12.07

12.07

12.05

12Q6

19.45

18.24

17.30

16.74

16.30

16.14

15.73

15.42

15.08

14.84

14.33

14.07

14.01

13.70

13.20

12.81

12.62

12.55

12.55

12.54

20.70

17.92

17.30

16.39

8.31

8.31

8.30

8.28

8.23

8.16

8.10

8.07

8.03

8.01

8.01

8.00

8.66

8.66

8.00

8.01

8.02

8.02

8.02

8.02

8.02

8.39

8.38

8.34

8.32

8.29

8.28

8.22

8.15

8.11

8.07

8.00

7.95

7.96

7.95

7.94

7.95

7.95

7.95

7.95

7.95

8.33

8.34

8.33

8.30

1009 !

1010

1010

1011

1010

1011

1013

1011

1007

1003

996

993

989

983

980

968

965

963

963

961

961

1048

1052

1032

1043

1042

1055

1075

1109

1091

1101

1100

1101

1085

1068

1037

1015

1001

997

998

998

1002

1003

1008

999

9.02 I

9.17 |

9.31 !

9.36

9.27

9.09

8.96

8.63

8.53

8.53

8.54

8.55

8.54

8.53

8.53

8.55

8.56

8.54

8.52

8.51

8.51

9.32

9.53

9.32

9.42

9.42

9.38

9.10

8.77

8.47

8.25

7.85

7.63

7.54

7.62

7.65

7.80

7.92

8.00

7.98

7.98

8.81

9.20

9.25

9.37

106.6

106.9

106.8

105.9

103.0

98.6

95.5

91.7

89.7

89.2

88.6

88.6

88.4

88.1

88.0

88.0

88.0

87.7

87.5

87.3

87.4

112.1

111.8

107.3

107.2

106.2

105.4

101.4

97.1

93.1

90.2

84.8

82.6

80.9

81.3

80.6

81.5

82.3

83.1

82.9

82.9

108.6

107.3

! 106.4

i 105.9

225
M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M4

M4

M4

M4

M4

M4

M4 ,_ __....

M4

M4 . ...,..... ,.....,.,

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

19.9

25.2

30.0

35.4

40.4

45.2

50.6

55.0

60.8

65.0

70.1

75.5

80.3

85.2

90.6

95.0

99.1

1.4

3.5

5.7

8.3

11.1

13.5

17.3 

19.9

24.3

29.2 _ .,..

36.8

40.5

46.5

51.6

57.7

64.8

70.4

79.6

85.0

98.7

1.5

4.5

7.8

11.7

16.1

20.4

27.1

32.0

37.7

43.8

49.0

i 56.1

14.89

14.05

13.72

13.01

12.79

12.69

12.58

^252

12.48

12.41

12.39

12.34

12.33

12ji

12.23

12.22

12.14

18.59

18.09

17.89

17.62

16.42

15.77 .. 

-" - ~j4jf ~

13.21

13.01 . ...... ... _...._..

12.58

12.44

12.36

12.30

1222

12.16

12.13

12.08

12.02

11.88

19.48

15.73

15.20

15.06

14.88

14.57

14.21

13.68 __

13.02

12.72

I 12.35

8.21 !

8.13 :

8.09

8.03

8.01

8.01

8.01

8.00

8.00

8.01

8.01

8.01

8.01

8.01

8.01

8.02

8.02

8.34

8.35

ft O . 75\J\J

8.35

8.35

8.34

8.31

a 27

8.19

8.17 ____...

8.13

8.12

8.11

8.11

8.10

8.10

8.09

8.09

8.09

8.09

8.34

8.32

8.29

8.28

8.27

8.25

Q22

8.19

8.17

8.14

8.12

8.09

999

1005

1006

1003

1000

1000

996

995

994

988

987

984

983

980

977

973

965

982

987

985

978

947

935

934 .,..... ...... _ . ..................

939

938 """""""""""937"""""""""

937

936

935

936

936

938

939

938

935

931

924

931

930

928

925

929

923

921

926

921

926

926

9.26

8.92

8.69

8.53

8.48

8.49

8.53

8.53

8.52

8.51

8.52

8.52

8.52

8.51

8.52

8.51

8.52

8.99

9.13

9.15

9.19

9.30

9.44

9.49 """"""" - g^y-"----"--

9.13

9.04

 -Q-QQ -

8.96

8.94

8.89

8.89

8.89

8.87

8.85

8.84

8.84

8.84

9.20

9.56

9.56

9.46

9.46

9.46

9.42

9.35

9.29

9.21

9.12

i 9.08

101.3

95.8

92.6

89.5

88.6

88.5

88.7

88.6

88.4

88.1

88.2

88.1

88.0

87.9

87.9

87.8

87.7

106.3

106.8

106.6

106.5

105.1

105.2

~ ~-YQQJ 103.8

96.2

94.8 """"""'''"""""""93":4"""'""""" """""""

93.1

92.6

91.9

91.8

91.6

91.3

91.1

I 90.9

i 90.7

90.4

110.6

106.4

105.2

103.8

103.4

102.7

101.4

99.6

98.4

96.7

95.1

93.9

226
M5

M5

M5

M5

M5

M5

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

63.6

70.5

75.8

82.1

91.2

97.8

1.1

1.7

4.3

6.2

82

10.6

15.1

202

25.1

30.6

35.2

40.1

45.1

50.0

54.9

60.2

65.1

70.2

75.0

79.9

85.1

89.7

95.3

97.3

1.3

2.8

3.4

5.1

7.8

9.5

11.8

14.0

16.8

20.1

24.3

27.4

33.1

39.9

44.0

47.7

53.3

59.7

70.1

I 75.8

12.19

12.03

11.96

11.83

11.75

11.74

17.95

17.75

17.53

16.83

16.63

16.35

15.84

15.42

13.70

12.97

12.71

12.44

12.08

11.85

^jjg

11.66

11.61

11.55

11.49

11.47

11.45

11.42

11.40

11.41

18.32

18.24

18.1 5

17.91

17.25

17.06

16.49

15.38

14.96

14.72

14.35

13.80

13.00

12.66

12.41 1 22g

12.03

11 74

11.41

11.36

8.08

8.07

8.06

8.06

8.05

8.05

8.37

8.37

8.37

8.37

8.36

8.35

8.33

8.30

8.16

8.11

8.10

8.09

8.07

8.06

8.06

8.05

8.04

8.04

8.04

8.03

8.03

8.03

8.03

8.03

8.35

8.35

8.35

8.34

Q32

8.31

8.29

8.22

8.18

8.16

8.15

8.13

8.11

8.10

8.09

8.08

8.07

8.07

8.05

8.03

927 | 9.05

922 i 9.03

924 j 9.02

919 9.03

913 ; 9.04

913 I 9.00

863 I 9.13

862 i 9.13

862 9.21

865 ! 9.32

867 I 9.36

869 I 9.39

881 ; 9.46

892 | 9.47

852 1 9.22

845 [ 9.21

855 I 9.14

857 ! 9.10

855 ; 9.02

847 I 9.01

848 I 8.98

846 i 8.95

845 I 8.93

843 i 8.91

842 8.91

841 I 8.90

840 ! 8.89

838 ; 8.88

838 I 8.87

838 | 8.85

848 I 9.18

849 I 9.15

848 j 9.22

849 i 9.26

848 | 9.36

848 i 9.41

849 ! 9.44

860 I 9.43

851 I 9.38

851 ( 9.38

851 f 9.35

850 ; 9.33

847 i 9.35

844 i 9.35

838 | 9.31

03g ^ g2g

830 i 9.26

825 ; 9.25

817 i 9.14

815 1 9.05

93.2

92.7

92.5

92.3

92.2

91.7

106.5

106.0

106.4

106.2

106.2

105.9

105.6

104.7

98.2

96.5

95.2

94.3

92.6

92.1

91.6

91.0

90.8

90.4

90.3

90.1

90.0

89.8

89.7

89.5

107.8

107.3 

107.9

107.6

107.7

106.8

104.2

102.6

102.1

101.0

99.6

98.0

97.3

96.4

95.8

95.0

94.3

92.4

91.4

227
M7 i

M7

M7

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M9

M9

M9

M9

M9

M9

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M11

M11

81.7

87.4

95.4

1.2

1.5

3.0

6.3

10.5

13.9

17.8

21.1

24.1

28.7

33.4

38.8

44.7

49.7

55.0

61.7

66.8

72.1

77.0

82.9

85.5

1.4

4.5

8.5

12.4

17.7

2pj _Q

1.4 .._ _.___

7.8

12.0

16.3

21.7

27.7

33.7

41.1

46.9

54.3

60.7

64.8

72.1

I 78.9

! 84.9

I 92.2

98.6

1.3

L. ...3-4 _

11.31

11.30

11.29

17.93

18.18

17.90

17.59

16.93

16.19

15.03

14.45

14.11

13.83

13.49

12.98

12.72

12.22

11.83

11.58

11.44

11.35

11.27

11.23

11.23

15.32

15.31

15.19

14.64

13.56

13.15

19.23

17.64

17.23

16.91

16.61

15.83

13.09

12.86

12.57

12.54

12.50

12.45

12.44

12.19

11.88

11.86

11.82

11.80

16.81

i 16.80

8.03

8.02

8.02

8.38

8.40

8.40

8.38

8.36

8.31

8.22

8.18

8.17

8.15

8.14

8.13

8.12

8.10

8.08

8.07

8.05

8.04

8.03

8.00

7.98

8.23

8.22

8.20

8.15

8.01

7.95

8.35

8.36

8.35

8.34

8.32

8.30

8.17

8.14

8.11

8.10

8.10

8.09

8.09

8.08

8.07

8.07

8.06

8.06

8.38

8.38

815 i

815 I

814 I

864

842

844

845

847

849

850

853

853

853

852

850

847

837

828

821

819

817

815

815

816

852

852

852

854

857

858

931

Q2Q

928

928

933

941

942

936

935

934

932

932

932

925

916

915

914

914

i 957

i 957

8.99 I

8.93

8.89

8.96

9.05

9.10

9.08

9.19

9.31

9.30

9.31

9.33

9.36

9.34

9.39

9.35

9.30

9.25

9.20

9.11

9.01

8.97

8.78

8.57

9.39

9.47

9.42

9.08

8.14

7.73

9.13

9.42

9.51

9.47

9.44

9.48

9.30

9.16

9.08

9.05

9.05

9.03

9.01

9.01

9.02

9.03

9.00

8.97

9.27

9.38

90.7

90.1

89.7

104.5

106.0

106.0

105.1

104.9

104.7

101.9

100.8

100.2

99.9

99.1

98.4

97.4

95.8

94.4

93.4

92.3

91.0

90.4

88.5

86.4

103.6

104.4

103.7

98.7

86.4

81.3

109.3

109.1

109.3

108.0

:|07_Q

105.8

97.8

95.8

94.3

94.0

93.9

93.6

93.3

92.8

Q23

92.3

92.0

91.6

105.6

! 106.8

228
M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

6.3

9.4

13.3

17.3

20.3

23.0

25.5

28.3

31.2

34.3

37.5

40.6

45.4

459

16.77

16.73

16.47

15.82

15.68

14.24

14.02

13.44

13.17

12.98

12.83

12.67

12.60

12.59

8.38

8.38

8.38

8.34

8.34

8.27

8.24

8.20

8.18

8.17

8.14

8.10

8.06

8.04

957

958

959

973

969

977

982

971

968

962

962

965

964

964

9.39

9 ^Q 

. OC7

9.41

9.37

9.37

9.22

9.09

9.01

8.90

8.81

8.78

8.65

8.29

8.07

106.8

106.7

106.5

104.6

104.2

99.4

97.5

95.4

93.7

92.4

91.7

90.1

86.2

83.8

229
Table h. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for August 

1997.

Station Depth 

(m)

Temperature 

(Centigrade)

pH Conductance 

(us/cm)

Dissolved Oxygen 

(mg/L)

Dissolved Oxygen 

(%saturation)

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

M2

1.3

4.0

6.3

7.5

9.1

12.5

13.6

14.9

17.4

20.7

23.8

27.6

35.7

39.1

43.9

459

51.4

59.7

73.8

85.0

91.1

105.0

111.3

122.7

135.2

145.4

147.4

1.5

4.0

4.9

8.4

9.6

11.0

12.0

14.5

16.7

17.1

24.4

27.4

31.2

35.6

37.5

42.4

50.1

29.38 i

28.64

2322

27.69

27.45

27.22

27.05

23.05

20.22

18.65

17.66

16.79

15.83

15.22

14.39

13.57

13.02

12.69

12.41

12.25

12.14

12.10

12.05

12.00

11.99

11.99

12.00

31.95

29.74

28.84

27.76

27.59

26.92

26.31

25.00

23.15

20.96

18.91

17.67

16.42

15.32

14.75

14.18

13.71

8.27 \ 981

8.32 I 982

8.37 i 982

8.42 I 981

8.43 I 981

8.40 I 982

8.35 1 975

8.32 i 918

8.47 i 927

8.22 \ 935

8.18 1 943

8.13 ! 965

8.09 975

7.92 i 980

7.84 I 983

7.94 ; 972

7.95 \ 969

7.96 | 982

7.96 I 996

7.96 | 996

7.97 \ 999

7.95 I 1004

7.95 i 1007

7.90 I 1011

7.84 I 1014

7.81 ! 1017

7.80 | 1017

8.75 | 996

8.64 | 1000

8.71 1 992

8.49 ! 1030

8.42 j 1082

8.25 i 1251

775 | ^77

7.84 I 1053

8.01 i 965

8.14 I 970

7.70 j 985

7.63 \ 989

7.59 1 1006

7.64 | 1011

7.69 \ 1004

7.69 | 1003

7.69 j 1007

7.98 i

7.99

8.31

8.42

8.52

8.46

8.40

8.69

9.15

9.21

9.03

8.76

8.06

7.35

7.08

7.31

7.55

7.73

7.95

8.01

8.05

8.09

8.04

7.87

7.66

7.46

7.42

10.25

11.96

10.13

9.81

8.96

8.31

5.05

4.82

5.87

7.24

6.22

4.94

478

4.21

440

4.62

4.95

114.1

112.5

116.1

116.6

117.5

116.1

115.0

110.5

112.1

107.4

104.7

98.3

88.6

79.8

75.5

76.6

78.1

79.4

81.1

81.5

81.7

81.9

81.4

79.6

77.4

75.2

75.0

150.3

170.0

143.1

135.9

123.3

113.5

68.2

63.6

74.8

88.4

71.5

56.4

52.3

45.9

47.3

49.0

52.0

230
M2

M2

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

51.1 !

54.5 i

2.4

3.1

5.2

7.6

9.0

11.2

14.2

17.0

17.5

20.3

22.4

24.5

28.1

30.4

34.1

37.4

43.9

46.9

61.7

67.2

72.2

87.6

93.1

104.1

113.4

116.8

1.0

4.5

6.5

8.9

9.1

11.8

13.5

15.7

16.5

20.2

21.2

22.2

25.5

27.9

33.7

38.4

41.7

51.1

52.9

58.9

ggg

i 73.2

13.49 I

13.28

29.61

29.16

28.45

2gQ3

27.73

27.03

25.22

23.09

21.96

19.60

17.86

17.16

16.84

16.08

15.85

15.03

14.17

13.71

12.68

12.64

^240

12.22 ^ 2 Q9

11.99

11.98

12.01

29.23

28.91

28.63

28.04

27.22

26.58

25.92

24.77

21.61

18.02

19.02

17.61

16.55

16.07

15.48

14.98

14.11

13.45

13.23

12.76

12.62

12.34

7.74

7.62

8.38

8.41

8.41

8.39

8.38

8.35

8.33

8.25

8.24

8.17

8.15

8.21

8.05

8.04

7.91

7.88

7.86

7.89

7.95

7.96

7.97

7.96

7.95

7.94

7.93

7.91

8.38

8.35

8.36

8.49

8.52

8.47

846

8.17

8.22

8.05

7.93

8.06

8.03

8.05

8.13

8.20

8.11

7.91

8.05

8.04

7.97

8.07

1009 i

1064 I

966

970

975

975

973

960

958

896

872

879

884

937

926

941

954

960

963

951

965

952

957

976

974

983

990

991

919

919

936

942

961

959

936

840

845

: 828

830

I 831

858

876

905

903

911

926

928

933

I 939

i 941

4.93 [ 51.6

4.89 ! 50.9

8.16 i 116.8

8.14 I 115.6

8.41 \ 118.1

8.42 :; 116.8

8.47 i 117.3

8.56 i 117.4

8.60 \ 113.9

8.71 i 110.8

8.92 | 111.6

8.60 | 102.2

8.55 I 98.1

8.26 i 94.4

8.36 i 93.9

8.17 I 91.4

7.86 ; 85.5

7.40 \ 78.8

7.18 I 76.2

7.30 I 76.5

7.84 I 80.5

7.92 | 81.2

8.14 ] 83.1

8.24 I 83.6

8.28 I 83.8

8.24 i 83.5

8.20 | 82.9

8.09 I 81.8

8.00 i 113.7

7.97 \ 112.6

8.21 j 115.9

8.36 [ 116.5

8.64 i 118.6

8.66 | 117.6

9.05 I 119.0

8.75 | 114.8

8.61 I 105.5

7.94 \ 91.4

7.98 I 93.7

7.75 1 90.2

7.52 i 86.6

7.50 i 82.9

7.57 I 81.7

7.51 | 81.1

7.56 i 80.1

7.78 : 81.2

7_Q2 | 823

8.66 \ 82.3

8.18 I 84.6

} 8.35 i 85.1

231
M4 1 84.8

M4 ! 92.5

M4 | 100.6

M4 j 110.9

M4 I 115.9

M5 : 6.9

M5 I 2.1

M5 j 4.6

M5 ! 5.9

M5 i 8.6

M5 \ 10.0

M5 I 13.2

M5 ! 16.2

M5 16.8

M5 ! 19.9

M5 : 22.0 

M5 ] 23.7

M5 | 25.7

M5 S 26.6

M5 I 30.1

M5 ] 32.8

M5 ! 36.6

M5 | 42.6

M5 | 44.4

M5 | 52.6

M5 | 59.6

M5 | 63.3

M5 I 69.6

M5 i 75.8

M5 | 80.6

M5 i 84.5

M5 I 88.7

M5 j 94.9

M5 I 96.4

M5 j 100.8

M5 | 101.7

M6 : 2.2

M6 j 2.3

M6 j 4.0

M6 j 8.0

M6 I 8.7

M6 j 11.0

M6 I 12.5

M6 | 15.8

M6 I 18.4

M6 i 20.2

M6 | 21.0

M6 I 26.9

M6 i 28.5

M6 i 33.5

12.15

11.95

11.88

11.83

11.84

28.25

27.71

27.56

27.44

27.39

27.32

27.19

22.36

2i Q3

19.72

18.88 

17.95

17.60

17.22

16.40

16.25

14.76

13.85

13.23

12.93

12.72

12.54

12.38

12.21

12.12

11.97

11.94

11.84

11.87

11.83

11.87

27.86

27.86

27.83

27.79

27.69

26.58

25.02

23.06

2\~tf

20.40

18.55

17.43

16.44

15.64

8.04

8.04

7.98 I

7.95 i

7.90

8.71

8.46 :

8.38

8.38 i

8.38

8.38

8.37

8.19

8.17

8.05

8.00 ........,_^. ..............

7.96

7.96

794

7.93

794

7.96

7.96

7.98

7.98

7.99

8.66

7.98

7.98

7.98

7.97

7.96

7.97

794

7.87

8.38

8.38

8.39

8.38

8.38

8.36

8.37

8.18

8.09

8.66

8.00

7.90

7.89

7.89

944

949

951

959

959

906

905

907

905

905

904

843

836

811

811

804 

815

812

815

859

899

908

917

922

926

928

933

933

921

944

942

948

950

946

954

952

898

898

898

902

897

874

831

787

111

780

782

808

836

876

8.47

8.52

8.46

8.34

8.27

7.89

7.98

8.08

8.03

8.08

8.11

8.10

8.62

8.41

8.22

8.19 

8.65

7.99

7.75

7.68

7.81

7.64

7.74

7.93

8.10

8.22

8.21

8.29

8.36

8.43

8.41

8.46

8.44

8.44

8.43

8.41

8.13

8.16

8.14

8.16

8.11

8.20

8.83

8.78

8.50

8.25

8.00

7.83

7.41

j . 7.29

85.8

86.0

85.3

84.0

83.3

110.3

110.5

111.6

110.7

111.2

111.4

111.1

108.1

105.2

97.9

95.9 ................... .,.. _.........,. ......................

91.2

87.8

85.4

84.4

82.1

81.6

82.4

83.6

84.3

84.0

84.5

85.0

85.3

85.2

85.4

85.0

85.1

84.9

84.8

112.9

113.2

113.0

112.9

112.2

113.8

116.4

111.8

106.3

99.6

93.1

88.0

82.5

! 79.8

232
M6 i

M6 I

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M7

M7 

M7

M7

M7

M7

M7

M7

M7

M7 ,............__ ....,.

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M8

M8

M8

M8

M8

39.8

41.4

48.2

54.9

57.9

59.9

69.7

75.3

84.2

90.2

99.3

103.0

109.1

113.8

0.3

2.1

2:2

5.9

7.7

8.4

9.4

10.5

13.5

15.1 """""""T'5.4""^"""""

17.0

18.1

21.2

23.3

24.3

26.6

29.6

40.0

44.9

48.0

52.3

54.1

60.9

67.5

72.6

75.1

88.8

97.9

100.1

100.1

0.3

6.7

2.1

7.1

I 9.6

14.46

13.85

13.20

12.59

12.48

12.26

12.08

11.84

11.61

11.56

11.56

11.60

11.66

11.69

28.64

28.63 

28:48

27.77

27.43

27.01

25.70

24.84

23.45

20.13 ,...... _._. ......... ......

19.34

18.86

18.67

18.43

18.44

18.18

16.85

14.34

13.54

13.18

12.72

12.46

12.26

11.78

11.70

11.66

11.60

11.60

11.58

11.60

29.54

29.82

28.65

27.77

26.04

7.91

7.93

7.94

7.96

7.96

7.98

7.96 i

7.94

7.95

7.95

7.95

7.95

7.93

7.67

8.41

8.47 ... .. _... .........

8.43

8.46

8.40

8.40

8.43

8.13

8.11 

SlT

8.06

8.06

8.03

8.03

8.01

8.02

7.95

7.89

7.94

7.96

7.98

7.98

7.97

7.91

j£j

7.86

7.84

7.84

7.81

7.59

8.49

8.51

8.46

! 8.49

I 8.46

888 !

880

875 !

867

865

867

861

856

861

870

894

912

920

927

877

877 ....... .........._ .......,................

868

863

865

856

808

779

775 ............... ...._...... .......... ......

773

767

772

773

772

774

827

861

855

851

843

851

845

844

846

848

854

857

859

862

803

791

838

843

! 818

7.33 !

7.46 j

7.64 j

7.84 |

7.97

8.07

8.13

8.11

8.13

8.06

7.99

7.99

7.93

7.27

8.16

8.08 ........,..........,. __ . ... ,.

8.41

8.58

8.78

8.98

9.10

8.72

8.47 ........................... __.........,..... ,.........

8.28

8 \J 32\J^

Q -IK O. 1 vJ

8.08

8.08

7.99

7.90

7.62

7.84

8.01

8.17

8.31

8.43

8.20

8.05

7.95

7.85

7.76

7.64

7.26

9.09

8.41

8.59

i 9.11

\ 9.25

78.3

78.6

79.3

80.3

81.4

81.7

82.0

81.7

81.4

80.7

80.2

80.3

79.5

73.0

114.8

113.8 

......,..............,..... 1 ._._. .................. .._

116.5

118.2

120.6

119.9

119.8

111.6

101.6 

10471

97.8

97.4

94.9

93.7

93.8

92.2

89.5

81.1

82.0

83.1

83.9

84.9

85.7

82.5

81.5

79.7

78.6

111

76.4

72.7

129.9

121.9

120.3

i 126.2

I 124.3

233
.............,._.......,,,^

M8 I

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8 

1/18

M9

M9

M9

M9

M9

M9

M9

M9

M9

M9

M9

M9

M9

M9

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10

- - yo;-2j"""-~]

14.1 ;

14.5 |

19.6

23.8

25.5

31.9

37.2

43.3

46.6

56.4

61.5

63.9

67.8

80.2

84.2

ssTs

6.3

2.9

3.1

4.3

5.6

6.0

8.2

9.5

12.7

14.3

17.5

17.9

20.1

2i _Q

2.1

2.3

4.2

5.6

7.9

9.3

10.1

12.3

14.5

16.4

16.6

18.6

22.2

24.9

29.3

31.8

38.0

43.4

48.3

""""""""23:54""""""""""""""

21.43

 

19.03

18.51

18.37

18.19

16.30

13.88

12.80

12.51

12.27

11.94

11.76

11.63

11.54 """""""""1"1.54"""'

29.52

28.75

29.40

27.32

24.84

23.13

19.22

18.46

18.01

17.72

17.50

17.24

16.36

15.91

28.11

28.69

28.08

27.92

27.45

26.51

25.86

24.90

22.56

20.40

21.65

19.30

18.69

17.61

17.00

15.03

14.54

13.90

13.13

8.41

8.15

8.15

8.06

8.09

8.08

8.06

7.95

7.99

7.99

7.97

7.97

7.95

7.95

7.93

7.87 

7.83

8.49

8.56

8.50

8.46

8.40

8.29

7.98

7.87

7.93

7.96

7.64

7.73

7.31

7.29

g32

8.34

8.32

8.33

8.30

8.28

8.27

824

8.22

8.06

8.05

8.07

7.99

8.02

7.85

7.95

7.93

| 7.82

i 7.89

758

776

768

770

770

772

769

821

844

836

840

839

838

841

843

849 

850

002

807

801

757

771

753

769

772

772

775

785

794

806

810

924

920

920

914

911

893

885

852

804

781

787

788

800

841

895

904

912

920

916

"""""'""""" '""'9'. 32"""""""""""""""""""::

8.84 :

8.70 j

8.33

8.39

8.46

8.25

7.85

8.03

8.38

8.48

8.41

8.36

8.38

8.35

7.55 

8.31

8.40

8.66

8.37

8.59

9.02

8.93

8.89

8.69

8.11

7.92

7.20

5.88

2.42

1.62

8.19

8.06

8.13

8.09

8.25

8.16

8.47

8.56

8.60

8.43

8.49

8.18

8.00

7.77

7.54

7.32

7.34

7.42

7.35

1 23.6

108.9

104.8

98.5

97.5

98.1

95.2

87.2

84.7

86.2

86.4

85.5

84.4

84.2

83.7

75.5 '""""""""""""""""83'."l"""""""""""""""""""

120.0

122.2

119.3

123.8

118.5

113.6

104.8

100.9

93.2

91.6

82.0

66.1

26.9

17.9

114.2

113.6

113.3

113.4

112.8

110.6

111.7

110.8

108.2

101.8

105.0

96.6

92.8

88.7

85.2

80.2

78.5

! 77.7

I 76.2

234
M10

M10

M10

M10

M10

M10

M10

M10

M10

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

M11

53.4

59.0

62.6

68.6

73.7

88.4

95.5

100.7

100.7

1.3

3.6

5.1

7.2

_______

11.4

14.6

15.6

17.0

18.1

20.7

20.7

26.1

29.2

33.0

36.8

43.4

45.6

12.74

12.65

12.46

12.45

12.27

1204

11.95

11.85

11.88

31.63

29.36

28.80

28.61

28.04

23.97

20.88

20.42

19.55

19.23

18.88

18.86

18.06

16.22

15.43

14.59

13.83

13.74

7.91

7.90

7.90

7.91

7.91

7.93

7.93

7.89

7.89

8.34

8.37

8.38

8.37

8.20

8.18

8.17

8.15

8.13

8.11

8.08

8.19

8.00

7.92

7.87

7.80

7.73

7.65

919 I

918 :

925

927

928

929

931

933

935

951

948

949

946

882

852

843

836

854

858

869

867

909

936

944

948

952

955

7.60

7.66

7.80

7.85

7.95

8.12

8.22

8.22

8.17

7.67

7.94

7.97

8.08

8.05

7.37

8.16

8.16

8.13

7.95

7.87

7.69

7.54

7.15

6.50

5.99

5.97

5.29

78.2

78.7

79.5

80.0

80.7

82.2

83.0

82.8

82.4

112.6

113.2

112.6

113.6

109.7

95.4

98.5

98.5

96.2

93.7

92.2

90.0

86.9

80.3

72.6

64.2

63.9

55.6

235
Table i. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for November 

1997.

Station Depth 

(m)

Temperature 

(Centigrade)

pH Conductance 

(us/cm)

Dissolved Oxygen 

(mg/L)

M1

M1

M1

Ml

M1

M1

M1

M1

M1

M1

M1

M1 ~-g-f~ 

Ml

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

M3

0.8

1.9

4

6.1

8

10

12

14.1

15.9

17.9

20

22.1 .... .___.,..

25.9

28.1

31

34.9

39.6

44.9

49.8

55.2

60.7

69.7

79.6

89.6

99.3

109.6

120

140

0.6

1.1

2

4

6.1

8

10.1

11.8

14.1

16.3

18.1

19.9

22.1

24.1

2g

19.8

19.7

19.67

19.63

19.65

19.65

19.65

19.61

19.63

19.63

19.61

19.61 ...........,... _...,....... ,

19.56

19.34

18.70

17.41

16.5

15.52

14.72

13.93

13.40

12.99

12.66

12.46

12.36

12.30

12.23

12.23

20.38

20.31

20.03

19.92

19.89

19.87

19.87

19.86

19.84

19.84

19.82

19.82

19.73

19.39

18.69

7.8

7.8

7.8

7.8

7.8

7.79

7.79

7.79

7.79

77g

7.78

7.78 " 7777 - ""

7.73

7.6

7.4

7.3

7.28

7.26

7.28

7.31

7.35

7.4

7.44

7.42

7.43

7.43

7.39

7.39

7.8

7.8

7.8

7.8

7.8

7.79

7.79

7.79

7.78

7.78

7.78

111

7.73

7.57

7.34

951

951

952

951

951.0

952.0

952.0

952.0

953.0

953.0

953.6

953.0 

953:0

951.0

949.0

899.0

909.0

936

954.0

954.0

955.0

947.0

940.0

933.0

941.0

943.0

944.0

949.0

949.6

944.0

943.0

945.0

944.6

945.0

945.0

946.0

945.0

945.0

945.0

945.0

946.0

943.6

916.0

857.0

7.87

111

111

7.69

7.67

7.65

7.62

7.62

7.6

7.59

7.55

7.5

~ j4Q 

7.23

6.46

5.42

4.93

4.9

4.86

5.1

5.56

6.01

6.48

6.82

6.8

6.76

6.78

6.5

6.5

7.9

7.88

7.85

7.83

7.81

7.8

7.79

7.78

7.74

7.69

7.67

7.63

748

6.59

: 5.47

236
 - M3" """""""""

M3

M3

M3

M3

M3

M3

M3 ,.......... . .,...... ....,

M3

M3 ...,...... ,__..................

M3

M3

M3

M3 .,,___,..,....

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4

M4 

M4

M4

M4

M4

M4

M4

M4

M4

M4

M5

28.1

30.1

32

34.9

39.9

45.1

50.1

55.5 -"60.4""""

65.1

70.2

sol

90.2

99.9

109.9

117

 ' - -Qj 

1

2

3.2

3.9

5.9

8

10

12

14.1

16

18

20.4

22.2

24.2

26.1

28.1

30.1

32.4

35.1

40

45.3

50.1

55.3 

60.2

64.9

69.6

80

90.3

100.2

110

120

130

0.5

18.43 i

17.97 !

17.7

17.22

16.44

15.48

14.52

13.73 

13730

13.09

12.91 12761""""'"'""

12.41

12.30

12.23

12.23 --"-Jg-g-"----"

19.44

19.44

19.5

19.5

19.44

19.42

19.42

19.41

19.39

19.38

19.29

:jg_;j7

19.11

18.94

18.76

18.36

17.89

17.45

17.1

15.72

;j4jg

14.41

14.01 

13^63

13.28

13.0

12.63

,,23-j

12.17

12.2

12.1

12.08

19.5

7.29 ;

7.29

7.28 I

7.27

7.27

7.26

7.27

7.31 

7.35

7.37

7.37 

7.39

7.39

7.39

7.38

7.36 ,......,__

7.83

7.83

7.83

7.83

7.83

7.83

7.83

7.82

7.82

7.82

7.8

7.79

7.79

7.73

7.69

7.55

7.43

7.38

7.36

7.35

7.36

7.36

7.37 

7:38

7.4

7.42

7.45

7.46

7.45

7.42

7.41

I 7.4

7.78

852.0 I 5.21

850.0 5.25

859 5.2

872 5.22

905.0 5.17

927.0 5.22

936.0 5.47

933.0 5.97 

926.0 6 ^ 6

923.0 6.58

922.0 6.7 ............... ....^.^...,.....,....^.,..., ,.....,g^ ... .......,...._

921.0 I 6.82

925.0 i 6.86

927.0 6.81

930.0 ! 6.63 ^ ............,,,........p.,...,........... _.....................

886 I 8.03

888 ? 7.98

889 | 7.96

889 i 7.94

890.0 j 7.93

888.0 i 7.91

890.0 I 7.9

889.0 i 7.87

889.0 I 7.87

889.0 ! 7.85

884.0 i 7.77

882.6 : 7.7

881.6 1 7.68

872.0 7.42

866.0 ] 7.27

836.6 j 6.64

821.6 ; 6.17

826.0 \ 5.77

840 J 5.55

880.0 i 5.53

902.0 i 5.64

907.0 i 5.79

913.0 : 5.92 ""' ^^Q - p -g-Qg 

915.0 i 6.32

919 i 6.53

912 ! 6.92

905.0 I 7.13

901 I 7.06

915 1 6.82

918 I 6.66

916 ! 6.53

874 ! 8.31

237
M5

M5

M5

M5

M5

M5

M5

M5 ..,.....__.,... 

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

___

M5

M5 _^ _ 

M5

M5

M5

M5

M5

M5

M5

M6

M6

M6

M6

M6

M6 

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

....,..__....,. .......

1.9

2.8

3.9

5.1

6.1

7.2

8.1

 Q~~j 

10

11.8

13.8

16

18

20

22.1

23.6

26

28

30.1

32.1

35.1

40.1 ^3 " 

50

55.1 gjoT""" 

64.9

69.8

81.1

90.2

100

109.7 

0.7

1.3

2.2

4.1

6.3

8 

10.2

12.1

14.3

16.2

18.1

20

21.9

24

26.2

27.9

 -- ^ g-g '

19.49

19.49

19.44

19.39

19.4

19.36

19.34 , , __ ,... .

19.25

19.24

19.20

19.18

19.17

19.17

19.13

19.13

19.11

19.10

18.84

17.51

16.82

16.10 15^3~ ~

14.49

^^^^ 14.01

13.30

13.02

12.61

12.26

^13

12.1

12.1

20.27

19.73

19.54

19.44

19.39

19.39 

i9.36

19.36

19.34

19.34

19.34

19.32

19.15

19.10

18.99

! 18.53

7.81 ;

7.81 i

7.8 !

7.81

7.81

7.81

7.8

7.8 ...... ...__................,

7.78

7.78

7.78

7.78

7.78

7.79

7.78

7.78

7.78

7.77

7.69

7.41

7.33

7.31

____

7.3

7.3

____

7.34

7.36

7.39

7.38

7.39

7.37

7.36

7.83

7.84

7.84

7.84

7.84

7.84 

7^83

7.83

7.83

7.82

7.82

7.81

7.76

7.76

7.73

7.63

..,_.........,.....................,

874 I

874

874.0

875.0

874

874.0 !

874.0 i 

874.0

873.0

873.0

873.0

871.0

868.0

867.0

866.0

866.0

867.0

869.0

869.0

834.0

844.0

867.0 g ____

901.0

903.0 .^^^^

908.0

907.0

905.0

890.0

901.0

899

899

853.0

858.0

860.0

861.0

862.0

862.0 

862.0

861.0

862.0

862.0

861.0

862.0

861.0

863.0

860.0

837.0

....................£... .........................

8.26

8.21

8.2

8.17

8.14

8.13

8.11 ,..,..... . ..,....._ ,... ,.,.. 

7.93

7.94

7.95

7.97

7.99

8

8.02

8.02

7.99

7.93

7.14

6.25

5.64

5.55

_____ .

5.64

5.72 f^

6.19

6.39

6.77

6.83

6.86

6.66

6.58

8

8.07

8.09

8.1

8.09

8.08 """""""8.05""'"""""""""

8.03

8

7.96

7.95

7.87

7.66

7.67

7.58

7.23

238
M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7 

M8

M8

M8

M8

M8

M8

M8

29.7

32

34.8

46.2

45.1

50

55.4

60.9

64.9

70.2

76.3

80.1

90.3

99.7

103.3

0.9

3

3.8

6

8.2

10

12

13.8

16.1

18.1

20.2

22.4

26.4

28.1

29.7

32

35

39.6

44.7

49.1

56

61.1

66.3

69.6

80.6

90.5

100.1

103.5 ....,.. ....._.,.,...... 

2.1

4

6.2

8

9.9

12.2

17.95

17.53

17.06

15.83

15.0

14.49

13.65

13.20

12.88

12.60

12.33

12.25

12.03

11.97

11.97

19.87

19.86

19.81

19.60

19.60

19.58

19.56

19.54

19.5

19.54

18.98

18.76

18.16

17.79

17.53

17.14

16.71

16.12

15

14.6

13.9

13.22

12.87

12.61

12.18

12.08

11.97

11.99 

20.05

19.84

19.73

19.70

19.68

19.65

19.58

7.57 ;

7.59

7.61

7.61

7.5

7.36

7.36

7.37

7.38

7.38

7.36

7.36

7.34

7.33

7.32

7.86

7.86

7.85

7.86

7.86

7.85

7.85

7.85

7.84

7.84

7.66

7.64

7.66

7.67

7.69

7.72

7.7

7.68

7.63

7.61

7.46

7.37

7.36

7.35

7.29

7.25

7.27

7.23 

7.93

7.93

! 7.93

! 7.92

I 7.91

I 7.9

! 7.91

806.0 i

804.0

803.0

803.0

819

873.0

873.0

865.0

856.0

848.0

842.0

842.0

844.0

853.0

858.0

857.0

858.0

858.0

859.0

859.0

860.0

859.0

859.0

859

859.0

833.0

819.0

807.0

803.0

804.0

804.0

801.0

797.0

796

797

821

838

837

835.0

833.0

836.0

845.0

846.0 ........ ...........__..,,,., .. ..... ..

840.0

846.0

846.0

846.0

846.0

846.0

7.2

7.42

7.54

7.74

7.27

6.04

6.19

6.39

6.51

6.65

6.6

6.51

6.37

6.17

6.06

8.29

8.25

8.22

8.23

8.16

8.13

8.1

8.07

8.01

8

7.37

7.35

7.45

7.69

7.89

8.01

8.11

8.23

8.15

8.17

7.24

6.56

6.53

6.47

6.04

5.57

5.64

5.48 .......,....................,_.....,,,.. ..,.^

8.38

8.4

8.35

8.26

8.13

8.14

239
M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

___

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M9

M9

___

M9

M9

M9

M9 _____

M9

M9

M9

M9

M10

M10

M10

M10

M10

M10

M10

M10

M10

M10 

M10

M10

M10

M10

M10

M10

M10

13.9

16

18

20

21.9

24.1

25.9

28.1

29.9

33.1 ~"":35:i

40. ~i

44.8

50

55

60

64.9

69.8

80.3

87.7

90

0.6

2.1 

3;g

6.1

8

9.9

12.1 ^3-,_

16

19

2^7

23.8

0.6

1.1

1.9

2.8

4

5.9

8.1

9.8

12.1

14.1 

16:i

18

20.1

22

24.2

26

28

19.58 i

19.54 I

19.5 I

18.41 I

18.04 |

17.67

17.45

17.23

16.99

16.57 

 __

15.65

15.25 \

14.79

14.34

14.6

13.04

12.64

12.23

12.07

^2.68

18.74

18.57 __

17.9

15.38

1407

13.76 

13J61

13.50

13.37

13.17

13.69

18.88

18.9

18.9

18.89

18.89

18.9

18.9

18.9

18.8

18.8 

18:8

18.8

18.8

18.8

18.8

18.8

18.8

7.91 i

7.89

7.87

7.65

7.7

7.71

7.76

7.74

7.77

7.79

 _____

7.7

7.67

7.65

7.62

7.57

7.36

7.34

7.33

7.2

7.06

8.01

8.01 ^____

7.96

7.58

7.6

7.61

____,

7.62

7.62

7.6

7.6

7.17

7.77

7.77

7.77

7.77

7.77

7.75

7.75

7.75

7.75 "~"""7. 75

7.75

7.75

7.75

7.74

7.74

\ 7.74

845.0 \

844.0 i

840 !

803

806.0

805.0

810.0

805.0

808.0

808.0

~ 804JD

796.0

794.0

795.6

799.0

800

837.0

832.0

829.0

828.0

833.6

838.0

_ __ 

840.0

.

835

780.0

772.0

771.0

 ___

770.6

771.0

774.0

771.0

866

866

866

867

867

868

871

872

g72

872

 -872--"

872

872

872

872

874

! 875

8.17

8.16

8

7.42

7.66

7.8

8.03

8.09

8.14

8.41

, ___

8.36

8.31

8.33

8.35

7.9

6.45

6.33

6.21

5.06

3.62

9.16

9.16 

9T27 "

8.99

7.99

8.42

8.59 

_

8.93

8.97

8.68

8.64

8.26

g22

8.21

8.17

8.13

8.11

8.02

7.99

7.98

7.96 ....... ...............,^.........,....,.,,....,,..,.,......

7.93

7.92

7.91

7.9

i 7.86

i 7.87

240
Ml 6 1 30/1 ]

M10 I 30.2 |

M10 | 32.5 ;

M10 I 35.1 (

M10 I 40.4 I

M10 : 45.3 :

M10 i 50.1 !

M10 I 55.1 !

M10 I 59.8 |

M10 | 64.9 ;

M10 \ 70

M10 ; 75

M10 ! 80.1 !

M10 1 90.5 i

M10 I 100.4 i

M10 ( 102.9

M10 102.9

Mil ! 0.8

Mil ! 1.8

M11 i 3.1

M11 i 4.2

Mil [ 5

Mil ! 6

M11 i 7.1

M11 ! 8.1

Mil \ 10

Mil i 11.9

M11 ! 14.2

M11 i 16.2

Mil ! 18.2

Mil ! 18.3

Mil | 20. i

M11 | 22.1

M11 ; 23.9

M11 | 26

M11 : 28.2

M11 i 30.1

M11 ! 34.2

M11 i 39

M11 44.1

Mil j 47.4

M11 I 47.5

17.73

17.7

17.04

16.52

16.2

15.3

14.31

13.7

13.4

13.17

12.9

12.77

^58

12.25

12.1

12.15

12.3

18.95

18.98

19.0

18.98

18.95

18.9

18.9

18.9

18.89

18.88

18.9

18.85

18.86

18.9

18.8

18.82

18.74 ,

18.5

18.1

17.8

17.0

16.4

15.23

14.7

14.6

7:46

7.46

7.36

7.36

7.34

7.31

7.3 ..__.__...

7.31

7.31

7.32

7.34

7.36

7.37

7.37

7.36

7.37

7.76

7.76

7.76

7.76

7.75

7.75

7.75

7.75

7.74

7.74

7.74

7.74

7.74

7.74

7.73

7.67

7.56

7.47

7.39

7.29

7.26

7.19

7.16

7.15

849 6.32

850 i 6.61

848 I 5.9

840 i 5.99

851 i 5.82

884 | 5.53

895 ] 5.53

899 I 5.62

901 I 5.76

902 I 5.85

900 i 6.07

897 | 6.25

896 I 6.47

891 I 6.68

892 i 6.64

892 ! 6.58

889 ! 6.56

914 i 8.03

915 ! 7.98

915 | 7.94

915 I 7.92

915 i 7.88

917 I 7.83

918 i 7.82

919 | 7.82

918 I 7.76

922 S 7.66

925 I 7.62

926 ! 7.62

925 | 7.61

926 I 7.62

926 i 7.61

925 i 7.56

923 | 7.14

929 ! 6.48

909 5.92

887 : 5.46

884 I 4.86

893 \ 4.56

917 i 3.92

! 921 ! 3.46

i 922 i 3.34

241
Table j. Water quality profiles for Hydroacoustic sampling stations on Lake Mead for January 

1998.

Station Depth 

(m)

Temperature 

(Centigrade)

PH Conductance 

(us/cm)

Dissolved Oxygen 

(mg/L)

M1 \

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

M1

Ml

M1

M1

M1

M1

M1

M1

M1

M1

M1

M2

M2

M2

M2

M2

M2

M2

M2

M2 

M2

M2

M2

M2

M2

M2

M2

M2 

.._

M3

M3

M3

M3

1.8

2.8

4.7

8.2

11.1

15.1

20.7

26.1

29.5

35.3

40.2

45.9

51.0

59.8

70.3

79.2

90.2

100.6

109.4

117.2

130.9

138.7

1.4

3.1

6.1

9.0

12.0

14.9

18.3

21.0

24.4 .__..... ...

30.0

35.0

40.0

45.0

49.7

54.9

 

59.0 Q~3"'~ 

2.0

4.1

6.0

10.0

12.76

12.76

12.77

12.76

12.76

12.76

12.74

12.73

12.67

^252

12.59

12.56

12.47

12.33

12.25

12.22

12.18

12.17

12.16

12.14

12.13

12.11

12.77

12.77

 ^2_77

^77

12.77

12.77

12.77

12.76

12.76 ........,.......,__ .............

12.76

12.75

12.70

12.69

12.67

12.69

12.84

 J2775 " 

12.77

12.76

12.77

12.77

7.52

7.52

7.53

7.53

7.52

7.53

7.52

7.51

7.49

7.46

7.44

7.43

7.40

7.36

7.34

7.32

7.30

7.30

7.30

7.29

7.28

7.26

7.60

7.60

7.60

7.60

7.60

7.60

7.60

7.60

7.60

7:50

7.60

7.60

7.59

7.59

7.58

7.57

7.54 

7:58

7.57

7.57

7.57

j 7.57

948 !

948

948 i

948

948

948

948

948

950

951

950

948

938

926

924

925

933

935

937

939

945

948

949

949

949

949

949

949

949

949

949 ......,.................^_...................

949

949

955

959

962

979

1036 """"""""""947"""""""""""""

947

947

I 947

I 948

8.56

8.47

8.47

8.43

8.38

8.33

8.29

8.19

8.02

7.64

7.52

7.37

7.01

6.54

6.38

6.17

6.01

5.99

5.97

5.93

5.77

5.65

9.01

9.01

9.04

9.02

9.00

8.99

8.96

8.95

8.94 """"""""""8:95""""""""""""'""

8.93

8.94

8.90

8.86

8.81

8.74

8.64 ""'"""'"""""8:76"""""'"""""""'"

8.78

8.79

8.79

8.78

242
M3 I 15.1 i 12.77

M3 I 20.1 : 12.78

M3 I 25.6 | 12.78

M3 i 31.8 ! 12.78

M3 s 35.6 i 12.78

M3 ; 40.2 I 12.78

M3 1 45.2 I 12.78

M3 | 50.6 j 12.78

M3 i 59.9 i 12.77

M3 I 70.1 | 12.70

M3 80.1 12.41

M3 I 90.3 ! 12.31

M3 ! 99.6 ! 12.16

M3 i 109.7 { 12.11

M3 j 119.7 12.09

M3 i 120.6 S 12.09 .......^...........^

M4 j 2.1 | 12.85

M4 ! 4.2 ; 12.85 ....... ........^.........^^^

M4 i 8.1 | 12.84

M4 | 10.6 1 12.85

M4 ] 147 ; 12.84

M4 | 20.3 ! 12.84

M4 | 25.1 1 12.85

M4 ! 30.3 i 12.85

M4 1 35.3 : 12.85

M4 i 40.6 12.81

M4 : 45.0 ! 12.81

M4 | 56.1 | 12.57

M4 | 60.1 \ 12.33

M4 I 70.2 | 12.24

M4 i 81.7 | 12.10

M4 i 89.9 I 12.05

M4 I 101.3 1 11.98

M4 i 110.4 | 11.97

M4 ! 120.8 11.98

M4 \ 130.7 i 11.97

M4 139.8 i 11.97

M4 140.4 I 11.97

M5 1.2 ; 12.49

M5 2.3 | 12.49

M5 4.8 I 12.49

M5 6.6 i 12.49

M5 10.9 I 12.48

M5 14.9 I 12.46

M5 20.8 i 12.40

M5 25.9 i 12.34

M5 ! 30.4 i 12.32

M5 ! 35.9 i 12.29

7.57

7.57

7.57

7.57 ;

7.57

7.57

7.56

7.56

7.56

7.54

7.41

7.39

7.42

7.43

7.31

7.31

7:53

7.58

7.58 

T58

7.58

7.57

7.57

7.58

7.58

7.58

7.57

7.55

7.53

7.52

7.55

7.56

7.56

7.56

7.57

7.58

7.58

7.58

7.58

7.58

7.63

7.63

7.63

7.63

7.63

7.63

7.63

7.63

7.63

! 7.62

948

948

948

948

949

949

950

950

951

948

922

917

913

915

938

938 

930

931

931 " " "ggj 

932

932

932

932

932

932

933

934

941

910

901

898

896

895

897

897

897

897

899

898

899

900

966

900

898

897

892

888

886

i 886

8.77

8.74

8.72

8.71

8.71

8.66

8.62

8.59

8.56

8.36

7.13

6.99

7.12

7.29

6.13

6.09 

8.81

8.79

8.80 .,..,.................__ ,. ., ,...,_... 

8.79

8.79

8.78

8.76

8.72

8.72

8.68

8.49

8.29

8.15

8.30

8.44

8.42

8.45

8.51

8.54

8.54

8.52

8.51

8.51

9.01

9.00

9.02

9.02

9.04

9.02

9.02

9.03

! 9.01

! 8.95

243
M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M5

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M6

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

M7

40.8 !

45.2

49.9

59.8

71.7

80.0

92.0

100.6

109.8

119.3

126.0

0.6

2.1

4.0

6.0

8.5

10.0

16.2

20.1

25.3

30.3

36.3

40.4

45.3

50.6

54.5

60.7

70.7

80.9

90.6

100.8

110.8

113.4

1.1

2.2

4.3

5.5

6.1

8.7

10.3

15.1

21.2

24.8

30.5

35.2

41.2

45.2

49.8

55.2

61.1

12.29

12.30

12.28

12.08

12.05

11.99

11.99

11.90

11.92

11.92

11.93

12.66

12.50

12.39

12.35

12.32

12.32

12.29

12.28

12.27

12.26

12.25

12.25

12.18

12.23

12.04

11.76

11.29

11.12

11.12

11.12

11.12

11.11

12.44

12.37

12.20

12.20

12.18

12.17

12.17

12.14

12.13

12.12

11.99

11.89

11.77

11.72

11.60

11.49

11.30

7.62 ;

7.62 !

7.62 I

7.60

7.61

7.61

7.62

7.61

7.62

7.62

7.62

7.66

7.65

7.65

7.65

7.64

7.64

7.62

7.61

7.60

7.61

7.61

7.62

7.54

7.54

754

7.55

7.60

7.60

7.60

7.60

7.60

7.60

7.65

7.64

7.63

7.63

7.62

7.62

7.61

7.61

7.60

7.59

7.54

7.55

7.58

7.59

7.60

7.60

7.60

888

893

896

894

903

899 ;

905

895 I

902 j

909

910

860

861

861

861

861

860

859

859

859

859

859

862

858

891

866

831

769

757

756

756

755

755

831

832

833

833

833

833

833

833

832

830

820

810

796

791

783

775

: 767

8.91

8.90

8.89

8.79

8.76

8.78

8.84

8.80

8.80

8.81

8.80

9.21

9.22

9.24

9.24

9.20

9.14

9.01

8.92

8.81

8.86

8.87

8.93

8.33

8.37

8.38

8.44

8.99

9.10

9.15

9.14

9.13

9.13

9.39

9.38

9.36

9.34

9.30

9.28

9.23

9.16

9.13

9.00

8.73

8.69

8.91

9.08

9.17

9.26

9.30

244
M7 ! 70.5 I 11.04

M7 i 79.2 ! 10.92

M7 ! 91.3

M7 I 100.0

M7 | 105.4

M8 I 1.7

M8

M8 

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M8

M9

M9

M9

M9

M9

M9 j^fg '

M9

M9

M9

M9

M9

M9

M9 

Mil

M11

M11

M11

M11

M11

M11

M11

4.5

7.2

9.5

11.6

15.4

19.9

25.3

30.0

35.7

40.9

45.9

50.6

55.3

60.6

65.5

69.3

75.2

81.0

85.9

87.2

0.3

3.1

4.7

6.3

8.1

10.2 .._., ,__ .

13.8

16.7 ..

19.0

20.9

23.3

24.9 ~~~~Q75~ - 

4.1

6.7

8.6

10.1

12.0

14.3

16.3

M11 I 17.9

10.89

10.84

10.84

12.31

12.32

12.32

12.31

12.31

12.28

12.22

12 10

11.94

11.73

11.57

11.45

11.40

11.36

11.23

11.17

11.06

10.88

10.81

10.59

10.59

lOQg

10.83

10.63

10.40

10.31

1024

10.18

10.17

10.17

10.13

10.12

10.11

10.11

10.13

11.99

11.99

11.99

11.98

11.99

11.98

11.99

11.98

11.98

M11 I 19.9 ! 11.98

7.60 756 9.39

7.59 ; 752 9.41

7.59 -" "7759

7.51

7.70

7.70

7.70

7.70

7.70

7.69

7.69

7.68

7.64

7.62

7.62 

7.61

7.62

7.62

7.61

7.61

7.61

7.59

7.59

7.59

7.56

7.68

7.67

7.66

7.64

7.63

7.61

7.59

7.58

7.58

7.57

7.57

7.57

754

7.49

7.69

7.70

7.69

7.69

7.70

7.70

7.70

7.70

7.70

752 ....__..... ... ..,.....,

9.42

9.41

765 9.33

817 9.72

816 9.70

gig Q72

816 9.70

816 9.69

816 9.66

816 9.61

815 9.53

803 i 9.41

786 9.30

780 .__, .............

774

775

767

769

763

753

750

755

756

717

716

 

716

716

717

719

722

732

734

735

736

741

743

890

894

894 .......................__, ,........,... ...

894

895

895

9.36 ......... __

9.47

9.51

9.51

9.50

9.54

9.52

9.49

9.56

9.65

10.50

10.51

10.49

10.42

10.28

10.17

10.05

10.00

10.10

10.09

10.07

10.07

9.97

9.81

9.47

9.54

9.54

9.52

9.53

9.52

9.52

895 | 9.50

895 i 9.49

7.70 i 895 ! 9.48

245
M11

M11

M11

M11

M11

M11

25.9 I

] 31.3 I

I 35.3 !

\ 40.3 I

I 47.7 |

I 49.1 I

11.97

11.97

11.97

11.94

11.74

11.72

i 7.70

! 7.69

I 7.69

| 7.68

I 7.66

I 7.66 j

896

896

898

906

932

933

9.46

9.45

9.43

9.38

9.32

9.30

246
APPENDIX C

ZOOPLANKTON DATA

247
List of common zooplankton collected from Lakes Powell and Mead. 

CLADOCERA

Bosmina

Ceriodaphnia

Daphnia

Diaphanosoma

Immature

Pleuroxus

Chydorus

Leptodora

Alona

Ilyocryptus

Daphnia

Daphnia

Macrothrix

Leydigia

Daphnia

COPEPODA

Leptodiaptomus

Harpacticoid

Calanoid

Cyclop old

Diacyclops

Mesocyclops

Nauplii

Epischura

Eurytemora

Tropocyclops

Acanthocyclops

ROTIFERA

Asplanchna

Brachionus

Brachionus

Conochiloides

Conochilus

Epiphanes

Euchlanis

longirostris

pulex 

brachyurum

sphaericus

kindtii

guttata

rosea 

laevis 

laticornis

lumholtzi?

ashlandi

copepodid 

copepodid 

thomasi 

tennis

affinis

prasinus

vernalis

girodi

havenesis

quadradentatus

unicornis 

brachionus

248
Filinia

Keratella

Lecane

Polyarthra

Pompholyx

Synchaeta

Trichocerca

Brachionus

Brachionus

Hexarthra

Contracted

Brachionus

Ploesoma

Ascomorpha

Brachionus

Gastropus

Kellicottia

Keratella

Colletheca

Marcochaetus

Monostyla

Notholca

Trichotria

cochlearis

crenata

vulgaris

sulcata

pectinata

pusilla

patulus

angularis

mira

rotifer

calyciflorus

saltans

ureolaris

hypotus

longispina

quadrata

libera

acuminata

249
250

200 -

150 -

100 -

50 -

0 -

0-1 Om

P1

 - Total

 » - Cladocerans

 A Copepods

 v Rotifers

120

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

CD

100 -

80 -

60 -

CD

§ 40

£

ro 20

Q.

o

N 0

80

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

60 -

40 -

20 -

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

250
120

100

80

60

40

20

0

0-1 Om

P2

- Total

- Cladocerans 

Copepods 

Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

140

120 -

==L 100 -

80

o

in 60

40 -

1

c

Q. 20 

o 

o 

N

50

40 -

20 -

10 -

0 -

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

251
P3

180

160

140

120

100

80

60

40

20

0

120

0-1 Om - Total

- Cladocerans 

Copepods 

Rotifers

v v

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

100 -

¥

CO

E 60 

COI 40

ro 20

Q. 

O

N 0

10-20m

I-..-v v vJan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80

60 -

40 -

20 -

0 -

20-30m

^ v V

Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

252
P4

160

140

120

100

80

60

40

20

0

100

0-1 Om - Total

 - - Cladocerans

& Copepods

 v Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80 -

cn v> 60

CO

E 

o 

b 40

c 

o

1 20

-59CL

o

o o

N u

10-20m

70 -r

60 - 

50 - 

40 - 

30 - 

20 - 

10 - 

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

253
P5

700

600

500

400

300

200

100

0

500

0-10m Total

 - - Cladocerans

A Copepods

 v Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

400 -

% 300 

ro

E

m 200

c 

o

"c. 100

"a. 

o

o n 

N u

10-20m

250

200

150

100

50

0

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

Date

254
P6

250

200 -

150 -

100 -

50 -

0 -

0-10m Total

Cladocerans 

Copepods 

Rotifers

 <7

100

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80 -

CD

60

05

E 

g

in 40

c 

o

_03 

Q. 

O 

O 

N

20 -

10-20m

35

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

30 -

25 -

20 -

15 -

10 -

5 -

0 -

20-30m

v v v $

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

255
P7

400

300 -

200 -

100 -

0 -

0-1 Om Total

Cladocerans 

Copepods 

Rotifers

180 

160 - 

140 -

co 120 -|

CO

I 100 -|

o

tfj 80 -

o 60 -

g 40 -|

Q. 8 2°-J

N

0 -\

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

80

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

60 -

40 -

20 -

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

256
P8

350

300

250

200

150

100

50

0

0-1 Om - Total

 - - Cladocerans

& Copepods

 v Rotifers

 v

160

^ 140 

§> 120

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

CO

100 -

80 -

CD

c 60 

£

"c 40

CD

o N

20 - 

0 -

80

60 -

40 -

20 -

0 -

 v

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

May-96 Aug-96 Nov-96 Jan-97 Aug-97 Nov-97 Jan-98 

Date

257
P9

180

160

140

120

100

80

60

40

20

0

80

0-1 Om - Total

- Cladocerans 

Copepods 

Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

V) c/)

o

CD

60 -

40 -

20 -

Q.

0 nu

10-20m

25

20

15

10

5

0

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

258
P10

250

200 -

150 -

100 -

50 -

0 -

0-1 Om - Total

- Cladocerans

- Copepods 

Rotifers

35

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

~ 30 A 

t 25

in 

%

o

20 -

15 -

! 10

c

OJ

Q. 5

o 

o

N

16

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

14 

12 - 

10 -

8 -

6 -

4

2 -|

0

20-30m

Nov-95 Jan-96 May-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

259
P11

300

250

200

150

100

50

0

0-1 Om - Total

 » - Cladocerans

 A Copepods

 v Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

120

100 -

^ 80 -

OJ I 60

in

§ 40

_<S 20

Q. 

O

N 0

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80

60 -

40 -

20 -

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

260
P12

300

250

200

150

100

50

0

0-1 Om

- Total

- Cladocerans 

Copepods 

Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

140

120

3, 100 -

ro 80

o

m 60

I 40 -I

 Q. 20

o

o

N o

10-20m

50

40

30

20

10

0

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

261
P13

400

300 -

200 -

100

0 -

0-1 Om Total

m- - Cladocerans

 A Copepods

 v Rotifers

-v- 

-i r I r i r

100

Nov-95 Jan-96 May-96 Aug-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80 -

O)

en o> 60 OJ

E 

g in 40

c 

-I I o

-£ 20 jo

Q.

o

O n

N u

40

10-20m

-i i i i i r -\ r

Nov-95 Jan-96 May-96 Aug-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

30 -

20 -

10 -

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

262
P14

100

80

60

40

20

0

0-1 Om - Total

- Cladocerans

Copepods 

 v Rotifers

Nov-95 Jan-96 May-96 Aug-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80

o 

in

C. 

JOJ 

Q_ 

O 

O 

N

60 -

40 -

20 -

10-20m

Nov-95 Jan-96 May-96 Aug-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

40

30 -

20 -

10 -

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

263
M1

300

250

200

150

100

50

0

400

Total

Cladocerans 

Copepods 

Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

o 

in

300 -

200 -

100 -

Q.

8 o

N

250

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

200 -

150 -

100 -

50 -

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

264
M2

300

250

200

150

100

50

0

0-1 Om - Total

- Cladocerans

- Copepods 

Rotifers

180

^ 160 

0) 140 

V 120

j= 100

o

in 80

o 60 

g 40

Q.

§ 20

N o

180

160

140

120

100

80

60

40

20

0

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

265
180

160

140

120

100

80

60

40

20

0

180

^ 160 

*o> 140 

oT 120

| 100

o

in 80

o 60 - 

S 40

Q. 8 20

N

140

120

100

80

60

40

20

0

0-1 Om

M3

 - Total

m- - Cladocerans

& Copepods

 v Rotifers

V 

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

266
160

140 -

120 -

100 

80 - 

60 - 

40 - 

20 - 

0 -

0-1 Om

M4

Total

Cladocerans 

Copepods 

Rotifers

v v

250

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

O)

200 -

150 -

100 -

c 

o

c 50 

jj

Q. 

O

o n N u

100

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80 - 

60 - 

40 - 

20 - 

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

267
M5

100 

80 - 

60 - 

40 - 

20 - 

0 -

0-10m

 v

180

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

160 -

co 120 -

CO

I 100 -

o

CQ 80

o 60 - 

§ 40

Q. 8 20 

N o

10-20m Total

- Cladocerans

 Copepods 

Rotifers

70 

60 - 

50 - 

40 - 

30 

20 - 

10 - 

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

268
250

200 -

150 -

100 -

50 -

0 -

M6

Total

Cladocerans 

Copepods 

Rotifers

140

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

120 -

3 100

w

ro 80

o

CO 60

c

o 

o

N

40 -

20 -

10-20m

 

m» -___ A*-~~ ~ - __ A

 -^? v -v v -v- -v v v

60

50

40

30

20

10

0

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

269
350

300

250

200

150

100

50

0

120

100

05

80 -

60 -

CD

§ 40

32

a 20

Q.

o

N 0

0-1 Om

M7

+- Total

 - - Cladocerans

 ^ Copepods

 v Rotifers

 

 

 -f^c. .___ A__ ___ ___ A__ ___ /2s 1= -tOr- ___ A

 JfP -=-.Gc=-=-.-=£r -v- -v v 0

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

-v- -v v v

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

50

40 - 

30 - 

20 - 

10 - 

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

270
M8

500 

400 - 

300 - 

200 - 

100 - 

0 -

0-1 Om - Total

 - - Cladocerans

 ^ Copepods

 v Rotifers

A _ _A - ^0 ^

300

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

250 -

200 -

OT 

co

n

§ 100 * > _*:

J5 50 Q.

o

N 0

10-20m

60 

50 - 

40 - 

30 - 

20 - 

10 - 

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

 v

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

271
M9

400

300 -

200 -

100 -

0 -

O)

V) (/>

(TJ

O

CD

70

60

o 

o

N 50

40

30

20

10

0

0-1 Om

Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

Aug-97 Nov-97 Jan-98

Date

272
200

150 -

100 -

50 -

0 -

0-1 Om

M10

- Total

- Cladocerans

Copepods 

 v Rotifers

250

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

200 -

O)

150

05

O

CO 100

c 

g

"c 50

.25 

o. 

o

O n 

N U

10-20m

* . A- ~- 

<7 V V V140 -r

120 -

100 -

80 -

60 -

40 -

20 -

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

Date

273
M11

350

300

250

200

150

100

50

0

200

0-1 Om

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

0) 150 -

g 

in

_ o.

8

N

100 -

50 -

10-20m Total

- Cladocerans 

Copepods 

Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

50 

40 - 

30 - 

20 

10 

0

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

274
140

120

100

80

60

40

20

0

120

100 ^

I 80

s 60

Q

P1

40 -

c 

-2 20

Q. 

O 

O 

N 0

0-1 Om Total

m- - Cladocera

 A Copepods

 v Rotifers

s- J*f / ~~ ^^ ' w

^.<V-..__ _/ ^.^-^^

 ^=^-^ -y 

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

70 T 

60 - 

50 - 

40 - 

30 - 

20 - 

10 - 

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

275
Zooplankton Density (#/!_)

to

O

cb 

en

Q) 

13

cb

G)

CD 

G)

(Q

cb

O5

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 <°

D 05 

Q)

(D Q) 3

cb

Q)

^c 

cbc

(Q

cb

c 

oo

oi oI OI OI

tn o

oi

CD 

Ol

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13

CD 

O5

CD 

O5

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CD 

O5 z

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cb

Q)

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cb

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cb

c 

oo

oi oI oI

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O5 c

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cb

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cb

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oo

0000

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Zooplankton Density (#/L)

-> NJ 

000

CO O

c

CD

CQ

cb

CDo

CD 

CD

O Q)

Q) ?

CD" jg

Q) 

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CD

(Qc

CD 

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CD

Q)

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CD

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CQ

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CD 

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CD 

00

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CO

CD 

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CO

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P4

100 

80 - 

60 - 

40 - 

20 - 

0

0-1 Om - Total

 - Cladocera

A Copepods

 v Rotifers

100

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80 -

60

0)

Q 40

c 

-I o

"c 20 jo

Q.

o

o

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

35 -r

30 -

25 -

20 -

15 -

10 -

5 -

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

278
Zooplankton Density (#/L)

O 

CD

cn

CD 

O>

Q>

CD 

0>

CQ

CD 

O5

D t

& f

<° S

Q> 

*<

CD

CQ

-P». O5 00 

O O O

O 

O

N) 

O

O 

CO

cn

Q>

CD 

O5

CD 

05

CQ

CD 

O5

O

i

CD 

05

Q>

13

CD

Q> »<

CD

C 

CQ

O

i

CD 

-J

O

I

N) 

O O

I

05 

O

00 

O

N)

o

3

O 

O

o

I 

CD

cn

CD 

O5

Q>

CD 

O5

C 

CQ

CD 

05

O

CD 

O5

CQ 

CD

i 

CD

N) 

O O 

_l____I____I
P6

80

60

40

20 -

0 -

0-1 Om - Total

- Cladocera 

Copepods 

 v Rotifers

120

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

100 -

80 -

10-20m

c

- 20 -|

Q. 

O 

O

NONov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

50

20-30m

40 - 

30 - 

20 - 

10 - 

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

280
P7

140

120

100

80

60

40

20

0

0-1 Om Total

Cladocera 

Copepods 

Rotifers

140

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

120 -

:100 -

(ft "u

c

Q 60 -

c 

o 

2 40

c

JO

Q. 20

o

o

N 0 -I

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

70 T 

60 - 

50 - 

40 - 

30 - 

20 - 

10 - 

0 -

20-30m

i r "i r

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

281
P8

400

300 -

200 -

100 -

0 -

0-1 Om - Total

 - - Cladocera

 & Copepods

 v Rotifers

250

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

200 -

150 'w

c 

0)

Q100

c 

o

c 50

o. 

o

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

100

20-30m

80 - 

60 - 

40 - 

20 - 

0 -

May-96 Aug-96 Nov-96 Jan-97 Aug-97 Nov-97 Jan-98

Date

282
P9

120

100 

80 - 

60 - 

40 - 

20 - 

0 -

0-1 Om Total

m- - Cladocera

 ^ Copepods

 v Rotifers

120

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

100 -

80 -

£60

Q 

40

 §. 20 ~

o 

o 

N 0

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

60

50 - 

40 - 

30 - 

20 - 

10 - 

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

283
P10

100

80

60

40

20

0

0-1 Om *- Total

 - - Cladocera

A Copepods

 v Rotifers

-\ r ~i i i r

70

60 -

:50 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

 540

c

(D

030

c 

o 

520

c

_OJ

Q.10

o

o

N 0

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80

20-30m

60 -

40 -

20 -

0 -

 i i i i i i i \ i 

Nov-95 Jan-96 May-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

284
O

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CD 

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CD

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CD 

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CD

C 

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CD

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Zooplankton Density_[#/Lj

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I I I I I I I I I

O

CD 

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Zooplankton Density (#/L)

M ^ O> 00 O M -£> 

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CO

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Zooplankton Density (#/L)

to

oo

(D

Z 

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CD

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00
P14

500 

400 - 

300 - 

200 - 

100 - 

0 -

0-1 Om - Total

 - - Cladocera

 & Copepods

 «? Rotifers

120

Nov-95 Jan-96 May-96 Aug-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

100 -\ 

S-80 -\

£ 60 ^

Q

S 40 -\

c

JS 20 -\

Q. 

O 

O

N 0 -

10-20m

70 

60 - 

50 - 

40 - 

30 - 

20 - 

10 - 

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

288
120 -r

100 - 

80 - 

60 - 

40 - 

20 - 

0 -

M1

0-1 Om

 - Total

 - - Cladocera

A Copepods

 v Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

70 

60 - 

50 -

 ~ 40 -

0) 

Q

20 -

I 10 O

o

N 0 -

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80

60 -

40 -

20 -

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

289
200 -r

180 -

160 -

140 -

120 -

100 -

80 -

60 -

40 -

20 -

0 -

M2

0-1 Om Total

 » - Cladocera

A Copepods

 v Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

120

Q

c

100 -

80 -

60 -

40 -

ro 20

Q. 

O 

O

N 0

60

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

50 - 

40 - 

3Q - 

20 - 

10 - 

0 -

20-30m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

290
70 T 

60 - 

50 - 

40 - 

30 - 

20 - 

10 - 

0 -

M3

0-1 Om - Total

 » - Cladocera

 & Copepods

 v Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

70

10-20m

60 -

50 -

~ 40

30 -

1 20

I 10

o

o

N 0

50

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

40 - 

30 - 

20 - 

10 - 

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

291
50 

40 - 

30 - 

20 - 

10 - 

0 -

M4

0-1 Om Total

 - - Cladocera

 4 Copepods

 v Rotifers

-i r n r -| r

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

60

50 -

40 -

£ 30 -

<D 

Q

§ 20 ^

05 10 ^

Q.

O

O

N 0 -

10-20m

ff^ 

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

50

40 - 

30 - 

20 - 

10 - 

0 -

20-30m

 V

-, ! ! ! ! ! ! ,_ n r

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

292
80

60 -

40 -

20 -

0 -

M5

0-1 Om

Total

Cladocera 

Copepods 

Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

100

10-20m

80 -

60 -

& 40

c 

o

05 

Q. 

O 

O 

N

20 -

0 -

60

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

50 - 

40 - 

30 

20 - 

10 - 

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

293
70

60

50

40

30

20

10

0

M6

0-1 Om - Total

- Cladocera 

Copepods 

Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

70

10-20m

60 -

50 -

~ 40

c 

& 30

1 20

I 10

o

o

N 0

50

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

40 - 

30 - 

20 - 

10 - 

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

294
120 -r

100 - 

80 - 

60 - 

40 - 

20 - 

0 -

M7

0-1 Om

Total

Cladocera 

Copepods 

Rotifers

^ A-_. \ X

 *^ oNov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

80

60 -

w 40

c

0)

Q

o 20 

_*:

c

OJ 

Q.

8 o

N

10-20m

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

40

30

20 -

10 -

0 -

20-30m

-V-. .. - -^^ ^ 

 m ^D 

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

295
Zoopankton Density (#/!_)

oI

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Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

10-20m

60 -

40

20

0 -

Total

Cladocera 

Copepods 

Rotifers

Aug-97 Nov-97 Jan-98

297
50 T 

40 - 

30 - 

20 - 

10 - 

0 -

0-1 Om

M10

Total

Cladocera 

Copepods 

Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

60

10-20m

50 -

40 -

£ 30 

Q

o 20 ±£

c.

OJ

Q. 10

o 

o

0 -

40

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

20-30m

30 -

20 -

10 -

0 -

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97

Date 

298
M11

80

60 -

40 -

20 -

0 -

0-1 Om

 Total

 » - Cladocera

 & Copepods

 v Rotifers

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

70 

60 - 

50 - 

40 - 

30 - 

20 -

o 1<H 

o

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0 -I

10-20m

<D

40

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

20-30m

30 -

20 -

10 -

0 -

 v

Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date 

299
APPENDIX D

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Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

120 -

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£ 100

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Nov-95 Jan-96 May-96 Aug-96 Nov-96 Jan-97 May-97 Aug-97 Nov-97 Jan-98

Date

325
APPENDIX E

PHYTOPLANKTON DATA

326
Net phtyoplankton collected from Lakes Powell and Lake Mead.

Bacillariophyta

Achnanthes spp. 

Asterionella spp. 

Coelastrum spp. 

Closterium 

Cyclotella spp. 

Cymbella 

Diatoma spp. 

Eunotia spp. 

Fragilaria spp. 

Gomphonema spp. 

Gyrosigma 

Melosira 

Navicula 

Nitzschia 

Pinnularia 

Rhoicosphenia 

Synedra 

Tabellaria spp.

Chlorophyta

Ankistrodesmus spp. 

Chlamydomonas spp. 

Coelastrum spp. 

Cosmarium spp. 

Eudorina 

Gloeocystis spp. 

Mougeotia spp. 

Oocystis spp. 

Pandorina 

Pediastrum 

Rhizoclonium 

Scenedesmus 

Sphaerocystis spp. 

Staurastrun 

Tetraedron

327
Chrysophtya

Dinobryon spp. 

Malllomonas Chrysophtya

Cryptophyta

Cryptomonas 

Rhodomonas spp.

Cyanophyta

Anabaena spp. 

Aphanizomenon spp. 

Aphanocapsa spp. 

Chroococcus spp. 

Coelosphaerium 

Gleocapsa

Gomphosphaeria spp. 

Lyngbya spp. 

Merismopedia spp. 

Microcystis 

Oscillatoria

Dinophyta

Ceratium spp. 

Gymnodinium spp. 

Peridinium spp.

Euglenophyta

Trachelomonas

328
10000

8000 -

6000

4000

2000 -

0 -

M1

Bacillariophyta

& <#> <#> <#»

3000

2500 -

OJ 2000 -I o

(/>

c

Q

ID 

O

1500

1000

500 -

1000

800 -

600 -

400 -

200 -

0 -

Chrysophyta

Dinophyta

4000

3000

2000 -

1000 -

70000

60000

50000

40000

30000

20000

10000

0

80000

60000 -

40000

20000 -

0 -

Chlorophyta

C<\ (^

Cyanophyta

<#> <#» <#»

Total

^ ^P

Date

329
Cell Density (cells/L)

D

Qi 

i 

CD

\

*.,

\.

O^c

Q)

O 

 D

IT

^ 

Q)

*.,
Cell Density (cells/L)

OJ

4-*>^

0

03 -^ ro

O 

T33"

 s.

Q)

o

v*
Cell Density (cells/L)

8

^r

-^

U) 

U) 

K)

V"frCD
Cell Density (cells/L)

0

Q)

r-l0

\

e> 

^

o o o

*>-!

S. -I

**r

°* -

8 8

o

 s.

Q)

^
25000

20000 -

15000 -

10000 -

5000 -

M6

30000

25000 -

= 20000 

O

±i 15000 -

c

0)

O 10000

0)

O

5000 -

1000

800 -

600 -

400 -

200 -

0 -

Bacillariophyta

Chrysophyta

Dinophyta

2500

2000 -

1500 -

1000 -

500 -

40000 

35000 

30000 

25000 

20000 

15000 - 

10000 

5000

0

60000

50000 -

40000

30000 -

20000 -

10000 -

Chlorophyta

Cyanophyta

 i i r

r£> o\

Total

Date

 * * / ^ /

334
O

Q)

i iCD

\

1,.

Cell Density (cells/L) 

8 I 8

 *-

\

1,.
Cell Density (cells/L) 8

OJ 

OJ

ON

o

Q)

r-t-

(D

3' go

T3

\p> ^

A, 

°k

4- 

-k
D

Q)

 ?>

V.

A, 

*r\

A«> 

^

^ 

V

Cell Density (cells/L)

-» N) CO

O O O

O O O

O3"

 2

§T33- 

»<_ 

5T

A, 

*r\

A, 

*r\

A,

*r\
Cell Density (cells/L)

oo O

Q) 

i iCD

°"<? 

A*. \.
Cell Density (cells/L)

U) 

U)

D

D£ CD"

> 

V 

*v

\

1,,

V

\

'^

V

v
Cell Density (# cells/L)

\f

'«p>

3 

O 

TJ

A,"r\

TJ3-

^ 

0)

°k

\ 

1,,

o

1o

TJ

°& 

k*.

^

^
Cell Density (# cells/L)

 e>

^

O

03

0

 e>

V

3 

O 

T3

"I 

0)

O

°6-

^xe,

>e>

^

O 

T3

O

3 

O 

T3

"I 

0)
Cell Density (# cells/L)

\

D

0}

f+-

CD

\

O

O

T3
Cell Density (# cells/L)

D

O 

T3

\

**

*0

"% 

V

V

CO

o

T3

^

V

^

%

1,.

^ 

^

O

\

O

x; 

Q) 

3 

O 

T3

\

 ?>

V
Cell Density (# cells/L)

/

°s> 

*<&.

O 

"O

\.

0)

CO -L -L -L

\

O

\

1,,

\

" P*

\

^
Cell Density (# cells/L)

^

v^

V-I

D

0)

« h

CD

o

V

o

 f

w 

o a

I

 >>

V

^a,

^
\

1,.

X

0 

Q)

i i-

(D

o o o

3 

O a

Cell Density (# cells/L)

o3-

 5 

c/> 

o o

I

O»< 

fl)

3 

O o

O CD 
Cell Density (# cells/L)

\

D

0) « ^

CD

 e>

V

V

'V

O O O 

CD CD CD

V

V

o

0)

o

T3

^

5T

^
oo

O

Q) 

i iCD

"s--

^

v

^«So

~°> 

HP,

Cell Density (# cells/L)

O) oo

O

o

T3

O < 

Q) 

3 

O 

T3

^

V
D 

&>

888

o

"«p<,

\* %-

"5;

 %.

°^^

^*>~

X«P<,

Cell Density (# cells/L)

CD CD CD

^

Ul Ul Ul Ul

Q)

O 

T3
\.

>s>

V

.

D

Q)

/

O 

T3

Cell Density (# cells/L)

& §

o

03

O 

T3

 <_S"
Cell Density (# cells/L)

U)

O 

0)

\

1,.

°>

V

13 

O 

T3

"I 

0)

^>

V

^

V

%

\

\^>^

V-I

^,<J>-

O

1 

O 

T3 ^> 

V
888

V*

 *-

Cell Density (# cells/L)

\

1,.

 *-

V*

-e±

\.

O 

a> 

o

IT

5T

 *-

\,
s 

°k

1SU

O

0) »-i0

o o o

o o 

o o 8 8

Cell Density (# cells/L)

0*000

(D (D (D (D

o

o

T3

f

 e>

F

^

^n

^**r
APPENDIX F

NETTED FISH DATA

Species Composition

Individual Fish Data

Length-Weight Regressions

354
Lake Powell -- Species Composition - November 1995-January 1998

Species

AvgTL

Max

Min

Avg Wght

Max

Min

Fish #

C Catfish

285

350

155

202

330

34

4

Carp

470

575

410

1342

2100

860

36

Threadfin

103

155

86

9

32

4

57

Strip Bass

467

622

165

1259

2300

36

136

Walleye

422

503

268

961

1400

640

7

Lake Mead - Species Composition -- November 1995-January 1998

Strip Bass RB Trout 

409 252 

772 

218

765 320 

2230 

100 

93 1

Species C 

AvgTL 

Max

Min

Avg Wght 

Max

Min

Fish #

Catfish 

338 

420

285

384 

540

228

3

Carp Threadfin 

453 115 

473 195

422

1149 

1330

986

7

85

15 

60

4

105

355
Location

m03

m05

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

m08

Date

02705/96

11/30/95

11/28/95

11/28/95

11/28/95

11/28/95

11/28/95

11/28/95

11/28/95

11/28/95

11/28/95

1 1/28/95

11/28/95

11/28/95

11/28/95

11/28/95

11/28/95

1 i/28/95

11/28/95

11/28/95

11/28/95

11/28/95

11/28/95

11/28/95

1 i/28/95

1 i/28/95

11/28/95

11/28/95

ii/28/95

11/28/95

02/06/96

02/06/96

02/06/96

02/06/96

02/06/96

02/06/96

02/06/96

02/06/96

02/06/96

02/06/96

08/26/96

11/20/96

11/20/96

11/20/96

11/20/96

11/20/96

11/20/96

11/20/96

11/20/96

04/28/97

04/28/97

04/28/97

Set Depth

34

30

7

18

19

23

24

12

24

23

22

32

7

23

35

25

14

24

34

23

35

11

22

i2

24

32

32

22

24

7

24

10

30

30

30

30

30

30

30

30

25

25

25

Species

ccf

ccf

tfs

tfs

tfs

stb

stb

tfs

tfs

stb

tfs

stb

tfs

tfs

tfs

tfs

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

tfs

stb

stb

stb

tfs

stb

stb

stb

stb

stb

stb

stb

stb

stb

rbt

stb

TL (mm)

310

285

ioo

165

ioo

430

320

105

108

350 140"

385

105

95

110

150

370

520

445

485

505

470

535

375

500

335

455

475

460

425

477

376

343

447

320

316

161

385

338

430

150

500

410

473

476

218

468

350

501

448

252

772

Weight (g)

228

900

500

600

700

700

1400

900

1200

1300

1000

i400

700

1200

500

800

1100

1000

800

948

498

350

898

290

264

36

588

344

698

1180

850

1100

1150

100

1008

600

1150

365

320

i 445

Mesh

1.25

T

0.5

0.5

0.5

1.25

1 .25 0.5^

0.5

1.25

0.5

1.25

0.5

0.5

0.5

0.5

1725"

2

16

1.6

2

1 .25

2

0.5

1.6

1 .25

i:e

1.6

176

1.6

1.6

1.6

1.25

1.6

1.25

1.25

0.5

1.6

1.25

1.6

0.5

2

1.6

1.6

1.6

1

2

1.2

2

1.2

1.2

1 .6

Capt. Dep.

35

37

39

39

39

39

39

39

39

39

39

39

39

39

39;

39

39;

39

39

39

39

39

39

39

39

39

39

39

39

39

40

40

40

40

40

40

40

40

40

40

30

18

23

5

23

27

22

2

28

8

18

12

356
Location Date

m08 08/05/97

m08 08/05/97

m08 08/05/97

m08 08/05/97

m08

m08

m08

m08

m08

m08

m08

m08

m08

m10

m10

miO

m10

m10

m10

m10

m10

08/05/97

08/05/97

08/05/97

11/04/97

11/04/97

11/04/97

Set Depth Species TL (mm) Weight (g) Mesh

35 ccf ' 420 1 540 1 i.6

35 carp 470 j 1212 1.2

35 carp \ 470 i 1272

35 tfs 138 26

35 carp 460 1046

35

35

25

25

25

11/04/97 25

11/04/97 25

11/04/97 25

02/07/96 17

02/07/96 16

02/07/96 11

02/07/96

02/07/96

02/07/96

02/07/96

02/07/96

m10 02/07/96

m10 r 02/07/96

m10 02/07/96

27

28

26

32

34

11

tfs 145 26

tfs

tfs

stb

carp

carp

stb

tfs

stb

stb

tfs

tfs

stb

stb

stb

Capt. Dep.

2

4

2 6

0.7 8

1.2 33

0.7 31

155 38 0.7 33

114; 8J 0.5 24

492! 10241 T.2 9

422 986 2.5' 20

473 1330 2": 8

488 1100 2; 13

156: 38 0.5 i2

330

325

i04

146

525

391

382

tfs 100

tfs 105

27 tfs 106

25

m10 02/07/96 21

m11 11/29/95: 12

m11 il 1 729/95 1 23

mil ! 11/29/95; 20

mil" '11/29/95 29

m11 11/29/95 13

;mfl 11/29/95

: m11 11/29/95

m11 11/29/95

3

2

7

stb

tfs

stb

stb

stb

tfs

stb

282 1.25 40

274

28"8

1320

482

462

8

8

8

305 238

105 6

290

385

495

100

235

stb 355

stb 310

tfs 150

mil 11/29/95! 2;stb 315

m11 " 11/29/95 35 ; tfs ; 97

mTl

mil

m11

m11

m11

m11

m11

m11

mil

11/29/95 23 stb 420

400

1 .25 40

0.5 40

0.5 40

1 .6" 40

1.6 40

1.6 ! 40'

0.5 40

075 40

0.5 40

1 .25

0.5

1.25

1.6

1.6

500

600

400

400

11/29/95 29 tfs "TOO

11/29/95 26 tfs ! 125

11/29/95 27 stb | 315 400

11/29/95 24!tfs ! 90

11/29/95 34

11/29/95

11/29/95

11/29/95

m11 : 11/29/95

m11 il/29/95

m11 11/29/95

m11

m11

m11

m11

m11

11/29/95

24

22

23

tfs 90

0.5 "1725'

1.25

1 .25

0.5

40

40

40

40

40

40

40

40

40

40

1 .25 40 , 0.5 40

1 .6 40

0.5 40

0.5

1.25

0.5

0.5

tfs 105 0.5

tfs 105 0.5

tfs 107T 0.5

19jtfs 160 0.5

26 tfs ! 100! 0.5

23 tfs 110 1 0.5

17 tfs "" 150 0.5

11/29/95 19

i 1/29/95 19

11/29/95 12

11/29/95 21

40

40

40

40

40

40

40

40

40

40

40

tfs 145 0.5 40

tfs

tfs

tfs

155 0.5 40

162 I" 0.5 40

150 ! 0.5 40

357
Location

m11

m11

mii

m11

m11

mil

m11

m11

m11

mi 1

mii

m11

mil

m11

mil

m11

mil

m11

mil

ml 1 -- 

m11

m11

m11

m11

mil

m11

mil

ml i

m11

m11

m11

m11

m11

ml 1

mil

m11

m11

m11

m11

m11

mil

m11

m11

m11

m11

m11

m11

mil mil"

m11

mil

Date

11/29/95

11/29/95

ii/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95'

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

ii/29/95

11/29/95^

11/29/95

ii/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

ii/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

11/29/95

1 1/29/95

11/21/96

11/21/96

11/21/96

11/21/96

Set Depth

21

32

29

26

26

i7

23

29

19

23

29

22

33

9

5

17

8

30

21

29

30

32

29

23

29

4

33

10

24

34

3

30

26

30

23

36

36

3

1 i

29

27

23

11

32

28

29

5

32

28

28

28

28

Species

tfs

tfs

tfs

tfs

tfs

stb

tfs

tfs

tfs

stb

tfs

stb

tfs

stb

stb

stb

stb

tfs

tfs

tfs

tfs

stb

tfs

tfs

tfs

stb

tfs

stb

stb

tfs

stb

stb

stb

stb

tfs

tfs

stb

stb

stb

tfs

stb

stb

stb

stb

carp

stb

stb

stb

stb

tfs

stb

tfs

TL (mm)

112

95

100

105

95

450

107

100

i55

450

125

425

95

440

310

455

420

i05

160

107

90

450

95

85

97

305

95

415

455

108

285

435

275

470

100

87

400

330

285

100

365

440

250

425

285

255

420

503

185

428

i01

Weight(g)

900

400

400

700

1208

56

814

8

Mesh

0.5

675

0.5

0.5

0.5

1.6

0.5

0.5

0.5

1.6

0.5

1 .25

0.5

176

i.25

1.6

1.6

6.5

0.5

0.5

0.5

1.6

0.5

0.5

0.5

1 ~25

O.ET

1 .6

1.6

0.5

1

1.6

0.5

1.6

0.5

0.5

1.6

1

0.5

0.5

i.25

1.6

0.5

1.6

2

0.5

1

1.6

2

i

1 .6

0.5

Capt. Dep.

40

40

40

40

40

40

40

40

40

40

40

40

40 !

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

40

20

13

13

25

358
Location Date

m11 ! 11/21/96

ml 1

m11

m11

m11

m11

m11

mil

m11

mil

mil

m11

11/21/96

11/21/96

Set Depth Species TL (mm) Weight (g) Mesh

28 tfs 97; el 0-5

28

28

11/21/96 28

11/21/96 28

11/21/96 r 28

11721/96 28

11/21/96 28

11/21/96 28

11/21/96 28

04/29/97

04/29/97

mil 04/29/97

m11 ' 04/29/97

ml 1 04/29/97

m11 11/03/97

ml "1 1 i/03/97

mil I 11/03/97

35

35

tfs 100! 8! 0.5

stb

stb

stb

tfs

stb

stb

stb

tfs

tfs

stb

462; 922 1.6

385 534

366 484

102 8

401 596 4

1.6

1.6

0.5

1 .6

Capt. Dep.

15

24

3

18

3

15

is

405' 566! 1 13

450 ! 628 1.6 13

192

100

475

35 stb T 595

35 tfs 100

35 carp , 425

33 j tfs 103

33

33

m11 11/03/97 33

imil T 11/03/97 33

mil i 11/03/97 33

mil \ i 1/03/97 ! 33

m11 11/03/97 33

tfs

tfs

stb

tfs

tfs

tfs

tfs

103

ioo

68 1 11

4 0.5 18

1050 2 10

2230 2.5' i7

4

1050

6

8

6

505 1104

102 8

96

104

146

m11 ' 11/03/97 33 tfs 102

m11 11/03/97 33Jtfs 103

ml i

m'11 m11

m11

rhlT

m11

m11

1^1/03/97 33

11/03/97 33

1 i/03/97 33

11/03/97 33

11/03/97

1 1/03/97

11/03/97

m11 11/03/97

m11 i 11/03/97

m11

m 1 i

m11

m11

m11

m11

m11

m11

11/03/97

11/03/97

11/03/97

33

33

stb j 575

8

0.5 1 21

2.5 [ 7

0.5

0.5

0.5

rt

29

25

30

0.5! 25

0.5 25

8 0.5 23

28 0.5

8

8

1638

tfs j 100' 4

tfs i 96 8

tfs

stb

tfs

0.5

0.5

2

0.5

0:5

94 4 0.5

12

21

24

29|

19i

28

470 860 1.6 5

i05 8 0.5: 28

33 tfs 100 1 8 0.5 25

33 stb 322 i 322 1.2

33 tfs ! 95 6, 0.5

33 tfs 195 68 1

33^tfs 106 8 0.5

Ssltfs

11/03/97 33

11/03/97 33

11/03/97

11/03/97

11/03/97

m11 11/03/97

!m11 11/03/97

:m11 11/03/97

m11 11/03/97

33

33

33

33

33

tfs

tfs

tfs

tfs

tfs

tfs

tfs

96! 8 0.5

105 8 0.5

103 10! 0.5

144 26! 0.5

114 10 0.5

100 6T 0.5

4

25

15

25

23

24

18

12

8

20

100 8' 0.5 21

i02

33itfs 101

33 ; tfs 100

m11 i 11/03/97 33 tfs

m11 11/03/97 33

m11 11/03/97; 33

m11 11/03/97 33

m11 11/03/97! 33

m11

tfs

tfs

tfs

tfs

11/03/97 33 tfs

172

98

8 0.5 25

8 0.5 8

8 0.5 14

44

8

108 8

109 8

104

106

0.5 : 14

0.5

0.5

25

24

0.5 19

10 0.5 16

8 0.5 18

359
Location

m11

p04

p04

p04

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p05

p07

p07

p07

LP07

ip07

p07

p07

p07

p07

p07

p07

p07

p07

p07

p07

p07

p07

p07

p07

Date

1 1/03/97

01/24/96

08/08/96

08/08/96

1 1/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

1 1/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

11/03/95

01/23/96

08/12/96

05/08/97

11/02/95

01/20/96

01/20/96

01/20/96

01/20/96

01/20/96

01/20/96

01/20/96

01/20/96

01/20/96

01/20/96

01/20/96

08/09/96

08/09/96

08/09/96

1 1/03/96

11/03/96

08/21/97

10/31/97

Set Depth

33

16

11

8

12

12

12

13

16

29

20

2

17

16

17

30

13

14

14

13

A^J 17

15

14

15

25

16

15

19

15

13

25

8

30

2

13

12

6

13

23

13

8

8

8

22

12

22

15

20

35

35

35

35

Species

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

wal

tfs

wal

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

tfs

stb

ccf

stb

tfs

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

stb

carp

carp

carp

carp

tfs

carp

stb

TL (mm)

106

100

105

105

97

110

107

112

105

503

153

268

100

107

94

97

114

102

113

102

97

103

93

100

97

107

95

98 "112

108

165

350

605

95

555

525

515

560

560

540

545

545

555

570

570

480

575

480

480

105

490

260

Weight (g)

8

6

10

10

_

1400

36

330

1912

1700

1500

1260

1800

1775

1725

1580

1530

2030

1600

1750

1400

2100

1500

1400

1394

194

Mesh

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

2 0~5

1

0.5

o^

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

0.5

1.6

2

0.5

2

2.5

2

2.5

2.5

2.5

2.5

2.5

2.5

25

2

2.5

2.5

2.5

1.6

0.5

2.5

1.2

Capt. Dep.

18

30

40

403"f

31

31

31

31

31

31

31

31

31

31

31

31

31

31

31

31

31

31

31

31

31 :

31 !

31J

31

31

30

25

1

15

40

40

40

40

40

40

40

40

40

40

40

30

30

30

19

12

1

3

360
Location

p07

p07

p07

p07

p07

p07

p07

p07

p07

p07

p07

p09

p10

p10

pi 6

Date

10/31/97

10/31/97

10/31/97

10/31/97

10/31/97

10/31/97

10/31/97

10/31/97

10/31/97

01/29/98

01/29/98

11/06/96

Set Depth Species TL (mm) Weight (g) Mesh [Capt. Dep.

35 tfs 100! 6

35 ; carp 41 5 1 860"

35 stb 350! 380

35 carp 555 1680

35 carp 500

35 carp 470

1460

1224

35 carp 465 1 1320

35 stb 390 ! 580

35 tfs 100 6

33 ; stb 575 1446

337tfs 90 4

SOjCcf 290 165

1 1/05/95 2 stb 261 : 11/05/95 2.5 stb 335 \

11/05/95

piO 11/05/95

piO

p10

p10

piO

p10

p10

p10

p10

ipIO

05/06/96

08/10/96

28 ccf 297 ;

8 crp " 400

18;ccf 155

17jstb ! 585

08/10/96 16 carp i 460

08/10/96 2

11/04/96 40

08/22/97 30

08/22/97

08/22/97

08/22/97

jp 10 08/22/97

p10 08/22/97

p10 ! 08/22/97

p10 10/29/97

p10 01/29/98

p13 11/06/95

|p13 11/06/95

p13 11/06/95

p13 11/06/95

p13 11/06/95

p13 11/06/95

p13 11/06/95

i'p13 i 11/06/95

p13 11/06/95

30

30

30

30

30

30

32

40

2

13

4

stb

stb

stb

carp

tfs

stb

tfs

stb

tfs

carp

tfs

stb

stb

stb

12 stb

0.5 23

2 13

1"2'; 4

2.5 26

2.5 27

2.5 28

2.5 28

1.2 16

0.5 26

2.5 2

0.5 22

1.5 14

1 .25 33

i.25 33

1.6 33

2 33

34 0.75 40

23007

15007

315 344 |

510 1110!

380 530 |

460 1300

105 12

265 186

95

348

98

445

95

350

555

380

380

3 stb 365

5: stb 343

12 tfs ". 87

12 stb 575

15;stb 550

p13 i 11/06/95 5 stb 370

p13 11/06/95 ! 5

p13 11/06/957 2

p13 11/06/95 2

p13 11/06/95 6

p13 11/06/95 8

p13 11/06/95: 2

p13 11/06/95 [ 8

p13

p13

p13

p13

p13

11/06/95 12

11/06/95 2.5

stb 365

stb 340

stb 340

stb

stb

stb

stb

stb

stb

11/06/95 ! 2 stb

395

342

10

372^

10

1500

4

600

1800

800

700

2100

1600!

700

335 600

530 1700

512 1400

338

345

11/06/95: 23 stb 410

11/06/95 21 wal 430

700

800

2.5 30

2.5 30

1 30

2 3

1.6 2

2 24

0.7 3

0.7 1

0.7 6

1.2 1

0.7 9

1.6 18

0.5 19

1 .6" 40

2 40

1.6 40

1 40

1.6 40

1.25 40

0.5 40

2 40

2.5 40

1 40

1.25 40

1 .25 40

1725 40

1 .6 : 40

1.25 40

 

1.6 

- -

40

2 40

1.6 40

1 40

1.6 40

1 .6 ' 40

176 40

361
Location

p13

Date

11/06/95

p13 11/06/95

piS 11/06/95

p13

pTS

p13

p13

p13

p13

11/06/95

11/06/95

Set Depth Species TL (mm) Weight (g) Mesh Capt. Dep.

18 wal 410 1 900 '. 1.6 40

7 stb 365 1 700 1 .6 40

15 stb 560 1800 2 40

1 1 Tstb 530 1 500" 2 40

39 wal 430 800" 1 .6

11/06/95 20

11/06/95

11/06/95

11/06/95

pi 3 01/21/96

p13 : 01/21/96

p13 01/21/96

12

2

7

4

17

6

p13 Oi/21/96 17

piS j 01/21/96 ; 4

p13 01/21/96 6

p13 01/21/96 23

p13 01/21/96 18

p13 01/21/96 5

p13 01/21/96 11

p13 01/21/96 5

p13 01/21/96 13

wal

stb

stb

stb

stb

465 1200 2

595 2100J 2.5

365 ; 1T25

390

385

tfs 115

stb

stb

stb

stb

stb

stb

stb

stb

stb

525

40

40

40

40

800 1.6 40

690 1.6 30

6

1630

600 2060

360 ; 550

390

520 1470

545 1750

390

365

575

stb 520

p13 01/21/96 i2 stb 520

p13

pis

p13

piS

p13

; p13

pis

01/21/96 15 stb . 395

01/21/96 11 ; stb 555

650

0.5 30

2.5 30

2 : 30

i.6J 30

1.6! 30

2.5 30

2 30

1.6 30

540 1.6 30

1890 i 2 30

1620 2.5 r 30

1400

730

1600

01/21/96 7 stb 370 540

01/21/96

01/21/96

01/21/96

01/21/96

p13 05/07/96

piS " 05/07/96

pis

piS

p13

:p13

p13

17istb 590 2030 I '

8

12

17

stb 370 570

2.5

1.6

2.5

1.6

2

1.6

30

30

30

30

30

30 I

stb 560 1 1824 2 30 j

stb 540 1668 2 30

10 carp 450 1140 2.5 40

10|carp [ 445 1170 2.5 40

05/07/96 7

05/07/96 7

05/07/96 9

05/07/96

05/07/96

p13 05/07/96

|p13 08/11/96

! p13 i 08/11/96

10

7

14

carp

carp

carp

carp

carp

carp

458 1180 2

457 ' 1050 f 2

460 14401 2.5

450 ^ 1180 r 2.5

458

450

22 stb 560

11

p13 i 08/11/96 19

'piS 08/11/96 1

p13 08/11/96 17

p13 08/11/96 17

p13 08/11/96 26

stb 575

stb

stb

stb

stb

stb

piS 08/11/96 22 stb

pis

p13

p13

p13

p13

530

1160 2

40

40

40

40

40

1260 1.6 40

1550 2 35

1500

1470

330 385

550 1455

420 796

590 1830

575

08/11/96 21 stb 530

08/11/96 22 stb 575

08/11/96 22 stb 580

08/11/96, 26 1 stb 555

2.5 35

2.5 , 35

1 35

2 35

1 .25 35

2.5 : 35

1950 1.6 35

1300 1 2 35

 2 35

1980

1520

08/11/96 10 stb 554 1610

piS 08/11/96

p13 08/11/96

7 stb i 540 1480

31 stb 560 1760

2 35

1.6

2.5

2

2.5

35

35

35

35

362
Location

p13

p13

p13 p'13"

pi 3

p13

p13

p13

p13

p13

pi3

pIS

p13

p13

p13

pi 3

p13

p13

p13

p13

p13

p13

p13

p13

p13

p13

p13

p13

p13

p13

pi 3

p13

pIS

p13

p13

p13

p13

p13

'p13

! p13

p13

p13

p13

p13

p13

p13

pi3

p13

pTS

pi3

p13

p13

Date

08/11/96

08/11/96

08/11/96

08/11/96

08/11/96

Set Depth

14

Species TL (mm)

stb 535

13 stb 585

15^stb 545

19^tb 605

22 stb 500

08/11/96 13

08/11/96 6

08/1 i/96 ; 28

08/1 i/96 25

08/il/96 i7

08/11/96 28

11/05/96 30

11/05796" I 30

11/05/96! 30

11/05/96 30

11/05/96 30

11/05/96 30

stb

tfs

carp

stb

stb

stb

stb

stb

stb

stb

stb

515

i55

Weight (g) Mesh Capt. Dep.

1418 2 35

2000

1460

2004

1540

1190

32

550 1810

525 1380

61 5 "' 1990

51 O 1 i7iO

480 1304

575

430

585

540

stb 600

11/05/96 30 sib 570

11/05/96 30!stb 580

11/05/96 30 i stb i 510

11/05/96^ 30

1 1/05/96

ii/05/96

11/05/96

11/05/96

11/05/96

11/05/96

11/05/96

30

2 35

2 35

2 35

1.25 35

2 35

0.5 ! 35

2.5"! 35

! 35

2.5i 35

2.5 ! 35

1! 5

1800 2.5 18

860 1.6 29

2085 2.5 12

1680 2.5 ' 22

2240 2.5 5

1845

1910

1558

stb | 565 2000

tfs 100 8

30 stb 460 1084

2.5 7

2.5 13

2 7

2.5 22

0.5 21 !

2 24'

30 stb 520 1538 2 14

30 tfs 95

30 wal '". 410

30 tfs 97

30

11/05/96 30

ii/05/96 30

11/05/96

05/07/97

05/07/97

05/07/97

05/07/97

05/07/97

05/07/97

05/07/97

05/07/97

05/07/97

30

40

40

40

40

40

40

stb

stb

stb

wal

carp

carp

carp

stb

stb

8 0.5 20

640 1.6 29

8! 05 23

580 1 1986 2.5 27

490 1306 2 7

515' i486 2 5

460 990 1.6 15

476 1716 2.5 6

460

533

590

205

carp 454

40 carp 438

40 stb 491

40 carp 410

05/07/97 40 carp

08/23/97 30

08/23/97 30

08/23/97 30

08/23/97 30

tfs

stb

carp

stb

08/23/97 I 30 ccf

476

92

291

1234 2.5 2

1811 2.5 9

2.5 2

40 i 8

1036 2.5 2

1039 : 2.5 6

1818 2 4

976

1734

10

262

486 1060

352 420

332

08/23/97! 30 stb 350

08/23/97 30 i stb ; 495

08/23/97 ' 30 stb ' 522

08/23/97

08/23/97

08/23/97

30 stb 350

2.5 2

2.5"' 2

0.5 1

1.2 1

2.5 18

1J 1

278 1.2 12

1 ; 17

1076 2 27

1188

30Jstb i 622 1810

30 tfs ; 86 8

1.6 11

0.5 1

2 20

0.5 1

363
Location

p13

p13

p13

p13 pi~3

p13

p13

p13

p13

p13

p13

p13

pi 3

p13

p13

p13

p13

pi 3

pi3

p13 piS""

p13

piS

p13

pi3

p13

p13

pis

p13

p13

p13

p13

p13

Date !

iO/30/97

iO/30/97

iO/30/97

iO/30/97

iO/30/97

1 0/30/97 '

id/30/97"

iO/30/97

10/30/97

10/30/97

10/30/97

iO/30/97

10/30/97

10/30/97

10/30/97

iO/30/97

10/30/97

1 0/30/97

10/30/97

iO/30/97

iO/30/97

10/30/97

10/30/97

10/30/97

iO/30797

10/30/97

Oi/3i/98

01/31/98

01/31/98

01/31/98

01/31/98

01/31/98

01/31/98

Set Depth

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

32

Species

tfs

tfs

tfs

tfs

tfs

TL (mm)

100

98

100

92

104

stb ] 388

tfs 98

tfs

stb

stb

stb

tfs

stb

tfs

stb

stb

stb

stb

tfs

stb

stb

tfs

stb

tfs

tfs

stb

carp

carp

carp

carp

stb

stb

32 carp

100

390

514

390

104

390

132

380

380

382

306

102

426

Weight (g)

6

6

8

6

6

558

8

6

608

1316

556

10

640

is

596

530

574

304

6

784

41 1 756

100 6

282 206

98 4

106 8

555 1556

440 1138

422

470

472

372

426

460

1118

1475

1412

524

814

1202

Mesh Capt. Dep.

0.5 i 28

0.5! 13

0.5! 7

0.5 ! 12

0.5 1 12

1 .6 ' 2

0.5' 1

0.5 7

i.6 2

2 14

1.6" 8

0.5 13

1 .6 30

0^5 1

i.6! 2

1 .2 1

i.6 10

1 2

0.5 11

i.2 2

172] 1

0.5i 20

1 6

0.5 24

0.5 8

2 13

2.5 2

2.5 2

2.5 i 1

2.5 1

i.'e: 21

1.6 21

2.5 4

364
§

>

log(y) = 3.238(log(x))-5.612 

r2 = 0.985 

n = 132

FISH 224mm TL = 99.6g

6000 - 

5500 - 

5000 - 

4500 - 

5 4000 

T 3500 - 

~ 3000 - 

2500 - 

2000 - 

1500 - 

1000 - 

500 - 

0

e>

LJJ

100 200 300 400 500 600 700

TOTAL LENGTH (mm)

800 900

LAKE POWELL

log(y) = 3.197(log(x))-5.502 

r2 = 0.988 

n = 183

FISH 224mm TL= 102.7g

0 100 200 300 400 500 600 700

TOTAL LENGTH (mm)

800 900

6000 - 

5500 - 

5000 - 

4500 - 

3 4000 

IT 3500 

~ 3000 

2500 - 

2000 - 

1500 - 

1000 - 

500 

0

e>

LU

LAKE POWELL AND LAKE MEAD

log(y) = 3.222(log(x)) - 5.568 

r2 = 0.988 

n = 315

FISH 224mm TL = 101.0g

0 100 200 300 400 500 600

TOTAL LENGTH (mm)

700 800 900
APPENDIX G

ECHO-INTEGRATION ANALYSIS 

STANDING CROP DATA AND STATISTICS

366
DESCRIPTION OF THE DT ANALYSIS REPORT FORMAT

(Echo integration)

DT ANALYSIS REPORT,

DATAFILE INFORMATION,

Analysis Version:, Visual Analyzer Version 2.1.1,

File Name:, E:\P02A.DT4, 

Data Threshold:, -70.00, dB, 

Threshold Type:, squared, Information pertaining to equipment and conditions

Ping Rate:, 2.00, pps, 

Collection Range:, 0.98, to, 142.63, m,

Pulse Width:, 0.40, ms, 

Absorption Coefficient:, 0.036372, dB/m,

Salinity:, 0.00, ppt, 

Water Temperature:, 20.00, deg C, 

Sound Velocity:, 1522.16, m/s,

TRANSDUCER INFORMATION,

Serial Number:, 49526,

Beam Width:, 6.00, deg, Equipment specification 

Transmit Frequency:, 420000, Hz, 

Transmit Source Level:, 219.00, dB//uPa,

Receive Sensitivity:, -52.00, dBC/uPa,

Calibration Correction Narrow Beam:, -30.000, dB, A calibration setting used to amplify targets 

Beam Pattern Factor:, 0.000991,

ANALYSIS PARAMETERS,

Analyzed As: Single-Beam

Ping Range:, 10, to, 1950,

Sample Range:, 12.0, to, 42.0, m, Depth of analysis 

Data Threshold:, -60.00, dB,

Number Strata:, 3, Number of depth increments 

Number Reports:, 1, 

Density Scaling Constant:, 1.052194e-014,

BOTTOM TRACKER PARAMETERS AND RESULTS,

Bottom Threshold:, -3.00, dB,

Bottom Width:, 0.09, m, 

Blanking Threshold:, -60.00, dB, 

Blanking Zone:, 0.23, m, 

Blanking Type:, CUMULATIVE 

Alarm limit:, 05, pings, 

Tracking Window:, 1.79, m,

Number processed:, 1941, pings, Number of samples or pings examined

367
Number found:, 1941, pings, 

Find rate:, 100.00%,

VERTICAL INTEGRATION RESULTS, 

STRATA, TOP , BOTTOM, Sv (dB), Applied Sigma, FPCM,

1. 12.0, 22.0. -4.299652e+001. 6.000000e-002. 8.359816e-004. Fish Per Cubic Meter

2. 22.0, 32.0, -4.539699e+001, 6.000000e-002, 4.810048e-004,

3. 32.0, 42.0,-5.585411e+001, 6.000000e-002, 4.329502e-005,

HORIZONTAL INTEGRATION RESULTS,

REPORT, TIME AND DATE, Depth, Latitude, Longitude, Sv (dB) , Applied Sigma, 

FPUA,

, ---- ---- --, -------; - --- - - ^ . .^ - ^ ? . }

1, 08/08/9623:35:59, 136.9, 0° 0.000'N, 0° 0.000'E,-4.56534le+001, 6.000000e-002, 

1.360257e-002, Fish per unit (m2) area ( x 10.000 = fish/ha2)

VOLUME BACKSCATTERING STRENGTH (dB), 

REPORT 1,

STRATA 1, -4.300e+001,

STRATA 2, -4.540e+001,

STRATA 3, -5.585e+001,

ABSOLUTE DENSITY DISTRIBUTION MATRIX (IN NUMBER PER CUBIC METER), 

REPORT 1,

STRATA 1, 8.360e-004, Fish Per Cubic Meter

STRATA 2, 4.810e-004,

STRATA 3, 4.330e-005,

PERCENT INTEGRATED MATRIX, 

REPORT 1,

STRATA 1, 100.000, % of strata that was water versus bottom

STRATA 2, 100.000,

STRATA 3, 99.404,

368
Lake Powell - Pelagic Fish Study - ECHO-INTEGRATION 

Oct-95

P14

P13

P12

P11

P10

P09

P08

P07

P06

P05

P04

P03

P02

P01

Site# Transects

A

0

3

161

132

1197

99

597

476

3089

972

2879

B

0

43

356

90

1746

31

789

1510

5337

1468

1803

C

130

99

2

1025

340

513

4483

5791

1579

Fish/ha

Mean

1.50

205.33

101.67

46.00

1322.67

65.00

913.33

592.67

2957.33

4033.33

2045.33

11 16.70 avg.

Kg/ha

Biomass

0.10

20.53

10.17

4.60

132.27

6.50

91.33

59.27

295.73

403.33

204.53

11 1.67 avg.

Standard Standard Surface Area @ 3700 El.

Deviation Confidence Level Hectares

2.12

50.82

134.11

62.23

376.57

48.08

905.54

781.12

171.03

1488.05

2660.89

607.29 avg.

9.47

0

85.67

288.34

214.67

634.84

277.80

226.09

2508.63

4485.88

1526.62

1316.85

964.6 avg.

219.76

7175.85

3032.68

16520.51

2889.24

4353.64

4424.08

6150.90

5264.42

1583.65

2087.90

2265.72

1905.65

6019.73

63894 Total

Total Fish / Zone +/- Rang

Average Fish Weight = 0.1 kg 

Average Fish Length = 22.4 cm 

Confidence Level = .90 %

220 +7- 

1679591 +7-1470

1236049+/-1547

87660+/-167

2996800+/-1633

102937+/-107

5617820 

3120048+/-1647

+7-8998

9048704+/-7171

17559667+7-20980

8544436 +/- 8589

49993931 +/- 52314375 T

Lake Powell - Pelagic Fish Study - ECHO-INTEGRATION 

Feb-96

P14

P13

P12

P11

P10

P09

P08

P07

P06

P05

P04

P03

P02

P01

Site# Transects

A

0

1

490

85

45

236

25

1083

285

156

195

Mean

B

802

214

98

285

44

252

47

137

990

83

464

Biomass

C Fish/ha Kg/ha

1

622

114

83

35

1770

17

3499

126

67

497

57.00

72.00

638.00

66.50

244.00

633.00

137.67

29.67

1857.33

415.33

102.00

152.67

363.67 avg.

3.80

7.20

63.80

4.43

24.40

63.30

13.77

2.97

185.73

41.53

10.20

15.27

36.37 avg.

Standard Standard Surface Area @ 3700 El.

Deviation Confidence Level Hectares

122.98

80.61

156.61

44.55

984.88

129.00

15.53

11.31

1422.49

47.44

37.07

114.07

263.07 avg.

264.03

110.96

207.32

83.72

217.48

1660.37

26.19

50.51

2398.10

79.98

62.50

192.31

446. 12 avg.

219.76

7175.85

3032.68

16520.51

2889.24

4353.64

4424.08

6150.90

5264.42

1583.65

2087.90

2265.72

1905.65

6019.73

63894 Total

Average Fish Weight = 0.1 kg 

Average Fish Length = 22.4 cm 

Confidence Level = .90 %

Total Fish 7 Zone +7- Rang

15823+7-46

115242+7-345

4578192+7-2238

828716+7-1444

732409+7-1619

1206276+7-3289

386411 +7- 25

156178+7-157

11424269+7-15431

444071 

675410+7-305

+7- 387

1199998+7-612

21762995 +7- 25904576 T
Lake Powell - Pelagic Fish Study - ECHO-INTEGRATION 

May-96

P14

P13

P12

P11

P10

P09

P08

P07

P06

P05

P04

P03

P02

P01

Site# Transects

A

3

9

17

10

53

41

70

4

86

1

11

39

264

214

Mean Biomass Standard Standard Surface Area @ 3700 El.

B

301

27

12

95

26

147

11

17

13

11

290

39

60

131

C Fish/ha Kg/ha Deviation Confidence Level Hectares

416

40

155

12

71

8

7

9

90

50

14

18

26

242.00

23.00

106.67

11.67

55.33

30.67

41.33

8.33

12.67

51.50

115.67

28.33

161.67

101.00

70.7 avg.

24.20

2.30

10.67

1.27

5.15

0.83

1.17

5.53

3.07

4.13

11.57

2.83

16.17

10.10

7.07 avg.

209.82

79.39

20.74

29.50

43.68

18.68

4.51

5.03

12.58

48.79

151.34

90.96

98.02

27.47

60.04 avg.

353.72

34.97

49.74

73.65

31.49

133.84

7.60

8.49

217.82

21.21

255.14

46.30

153.35

165.24

11 0.90 avg.

219.76

7175.85

3032.68

16520.51

2889.24

4353.64

4424.08

6150.90

5264.42

1583.65

2087.90

2265.72

1905.65

6019.73

63894 Total

Total Fish / Zone +/- Range

53182+7-89

69752+7-112

765448 +7- 609

682793 +/- 974

105440+7-262

184625+7-246

26441 +7- 63

17392+7-18

66700+7-131

81558+7-109

711475+7-1673

467103+7-502

439718+7-761

125334+7-216

3796960 +7- 5773598 T

Average Fish Weight = 0.1 kg 

Average Fish Length = 22.4 cm 

Confidence Level = .90 %

Lake Powell - Pelagic Fish Study - ECHO-INTEGRATION 

Aug-96

P14

P13

P12

P11

P10

P09

P08

P07

P06

P05

P04

P03

P02

P01

Site# Transects

A

1382

136

2269

674

911

1357

588

2772

1361

1928

763

499

7632

2806

B

1139

319

1330

961

828

2078

573

2237

1296

2175

106

6864

3795

3534

C

1570

183

1566

766

607

1684

465

3160

3100

406

6794

3724

5196

Fish/ha

Mean

1363.67

212.67

1721.67

800.33

782.00

1706.33

542.00

2723.00

1328.50

2401.00

337.00

7096.67

3441.67

3164.33

1972.92 avg.

Kg/ha

Biomass

136.37

21.27

172.17

80.03

78.20

170.63

54.20

272.30

132.85

240.10

33.70

709.67

344.17

316.43

197.29 avg.

Standard Standard Surface Area @ 3700 El.

Deviation Confidence Level Hectares

216.08

95.04

361 

146.55

157.13

488.47

.02

67.10

617.82

45.96

205.39

463.45

2239.50

551 .65

464.93

437. 15 avg.

113.13

608.62

247.06

264.90

823.49

160.22

364.29

1041.56

346.25

781.30

205.20

3775.47

783.81

930.00

746.09 avg.

219.76

7175.85

3032.68

16520.51

2889.24

4353.64

4424.08

6150.90

5264.42

1583.65

2087.90

2265.72

1905.65

6019.73

63894 Total

Total Fish 7 Zone +7- Range

299679 +/- 94

644951 +7- 554

12919039+7-5021

12354424+7-6738

3251673+7-1373

4817790+7-1727

1228020+7-278

5013048+7-2446

2103879+7-102

14335016+7-4858

2072853 +7- 2425

13999262+7-19612

20503974+7-2421

14983779+7-4306

108527387 +/- 51963517 T

Average Fish Weight = 0.1 kg 

Average Fish Length = 22.4 cm 

Confidence Level = .90 %
Lake Powell - Pelagic Fish Study - ECHO-INTEGRATION 

May-97

P14

P13

P12

P11

P10

P09

P08

P07

P06

P05

P04

P03

P02

P01

Site# Transects 

A 

15

13

0

54

32

18

13

2

1

68

192

36

36

B

4

6

0

39

30

2

7

105

52

Mean Biomass Standard Standard Surface Area @ 3700 El. 

C Fish/ha Kg/ha Deviation Confidence Level Hectares 

13.00 1.30 219.76

0

24

7

5

1

0

23

2

6

182

12

72

12.00

19.50

9.67

5.50

4.67

46.50

28.33

2.00

4.67

105.33

118.33

24.00

30.27 avg.

0.20

0.47

4.65

2.83

0.97

0.55

0.47

1.20

1.95

10.53

11.83

2.40

3.03 avg.

6.36

20.78

4.73

7.37

0.71

7.23

10.61

0.00

3.21

16.97

75.72

58.16

17.65 avg.

12.20

35.04

28.41

3.16

12.43

7.97

47.35

5.42

0

98.05

127.65

75.76

37.80 avg.

7175.85

3032.68

16520.51

2889.24

4353.64

4424.08

6150.90

5264.42

1583.65

2087.90

2265.72

1905.65

6019.73

63894 Total

Total Fish / Zone +/- Range

2857 +/- 28

198246+7-5947

139929+7-1982

28112+7-782

10481 +7-19

73640 

59150+7-187

21909+7-317

+7- 237

24585+7-315

12302+7

523501 +7- 5043

458569 +7- 6094

69342+7-1040

1619767 +7- 2063167 To

Average Fish Weight = 0.1 kg 

Average Fish Length = 22.4 cm 

Confidence Level = .90 %

Lake Powell - Pelagic Fish Study - ECHO-INTEGRATION 

Aug-97

P14

P13

P12

P11

P10

P09

P08

P07

P06

P05

P04

P03

P02

P01

Site# Transects

A

4

2

30

5

1

86

28

2810

94

91

208

336

3893

1141

Mean Biomass

B

8

22

17

17

1

34

1661

2

728

158

3816

1085

66

14

39

31

C

6

15

728

206

252

390

3282

Fish/ha Kg/ha

5.00

45.00

11.67

31.00

10.67

28.67

17.50

1620.33

94.00

46.50

984.67

380.67

248.67

3663.67

51 3.43 avg. 51

4.50

1.17

3.10

1.07

2.87

1.75

0.50

162.03

9.40

4.65

98.47

38.07

24.87

366.37

.34 avg.

Standard Standard Surface Area @ 3700 El.

Deviation Confidence Level Hectares

4.24

11.06

19.09

8.50

36.76

14.36

31.48

1210.51

89.05

62.93

332.77

224.04

300.80

180.43 avg.

61.97

24.22

53.07

14.34

18.65

85.24

18.94

2040.75

561 

377.69

507.11

150.12

280.96

.00

322.62 avg.

219.76

7175.85

3032.68

16520.51

2889.24

4353.64

4424.08

6150.90

5264.42

1583.65

2087.90

2265.72

1905.65

6019.73

63894 Total

Total Fish 7 Zone +7- Range

1099+7-13

53072+7-818

186612+7-3671

176224+7-2642

205710+7-1578

22233 +7- 514

101957+7-1608

3383024 +7- 50525

73640+7-1409

494855 +7

4286899+7-17979

1684114+7-23094

1529544+7-10948

10585309+7-17656

22784293 +7-13246117 To

Average Fish Weight = 0.1 kg 

Average Fish Length = 22.4 cm 

Confidence Level = .90 %
Lake Powell - Pelagic Fish Study - ECHO-INTEGRATION 

Oct-97

P14

P13

P12

P11

P10

P09

P08

P07

P06

P05

P04

P03

P02

P01

Site# Transects 

A

2

69

0

18

7

552

587

87

16

18

970

407

365

B

0

9

50

5

27

14

515

684

6

7

65

486

123

284

C

0

218

6

5

0

1954

723

8

29

376

262

113

Fish/ha

Mean 

0.67

9.00

112.33

1.67

13.33

12.33

1075.00

596.67

60.33

10.00

12.50

610.67

264.00

254.00

216.61 avg.

Kg/ha

Biomass 

0.07

0.90

11.23

1.33

1.23

0.17

107.50

59.67

6.03

1.00

1.25

61.07

26.40

25.40

21 .66 avg.

Standard Standard Surface Area @ 3700 El. 

Deviation Confidence Level Hectares

1.15

0.00

92.00

6.66

2.89

11.85

110.96

762.78

5.29

7.78

29.28

316.01

142.01

128.65

11 5.52 avg.

1.95

155.10

4.87

19.97

11.22

1285.94

187.06

34.73

8.92

49.36

532.76

239.41

216.89

2 11. 4 avg.

219.76

7175.85

3032.68

16520.51

2889.24

4353.64

4424.08

6150.90

5264.42

1583.65

2087.90

2265.72

1905.65

6019.73

63894 Total

Average Fish Weight = 0.1 kg 

Average Fish Length = 22.4 cm 

Confidence Level = .90 %

Total Fish / Zone +/- Rang

1978+

2022 +/- 60

806087+/-12055

27535 +/- 824

74243 +/- 782

25409 +/- 400

2435649+7-30971

1245780+/-4342

52644 

19796+/-174

+/- 526

371104+/-3567

1149361 

1123716+/-11148

+/-12363

1764363+7-17161

9099686 +/- 9438059 To

Lake Powell - Pelagic Fish Study - ECHO-INTEGRATION 

Jan-98

P14

P13

P12

P11

P10

P09

P08

P07

P06

P05

P04

P03

P02

P01

Site# Transects

A

9

14

31

13

2

54

11

149

11

20

4

16

192

91

Mean

70

B

4

6

1

45

123

18

11

5

38

91

25

Biomass Standard Standard Surface Area @ 3700 El.

C Fish/ha Kg/ha Deviation Confidence Level Hectares

4

20

3

24

83

25

39

11

43

38

13

39.50

6.00

14.00

19.00

9.33

2.50

45.67

105.00

22.00

16.00

13.33

15.50

122.00

51.00

34.35 avg.

4.57

0.93

0.25

1.40

1.90

0.60

3.95

10.50

2.20

1.60

1.33

1.55

12.20

5.10

3.43 avg.

43.13

6.24

12.53

8.02

4.73

0.71

55.24

4.04

6.36

19.92

5.20

35.34

60.75

20. 17 avg.

192.57

21.12

10.53

7.97

3.16

28.41

93.13

13.52

6.81

33.59

8.76

102.42

59.58

44.74 avg.

219.76

7175.85

3032.68

16520.51

2889.24

4353.64

4424.08

6150.90

5264.42

1583.65

2087.90

2265.72

1905.65

6019.73

63894 Total

Average Fish Weight = 0.1 kg 

Average Fish Length = 22.4 cm 

Confidence Level = .90 %

Total Fish / Zone +/- Ran

8681+/-134

18196 +/- 363

.136341 +/- 1793

15049+/-60

17786+/-171

103468+7-362

219230+/-2213

70192+7-368

24547+7-142

98414+7-2152

97330+7-398

531144+/. 4745

147351 +7-1935

1487729+7-1484237 To
Lake Mead - Pelagic Fish Study - ECHO-INTEGRATION 

Oct-95

Average 

M11

M10 

M09 

M08 

M07 

M06 

M05 

M04 

M03 

M02 

M01 

Site#

Fish Weight = 0.1kg 

Average Fish Length = 22.4 cm 

Confidence Level = 0.90

Lake Mead - Pelagic Fish Study - ECHO-INTEGRATION 

Feb-96

Transects 

A

0

272

16

0

72

17

517

29

190

B

0

212

3

1

12

4

82

63

358

C

412

11

0

6

15

11

1045

83

1

519

Fish/ha

Mean 

298.67

5.50

6.00

8.33

4.00

12.00

227.33

393.33

15.00

355.67

133avg.

Kg/ha

Biomass 

29.87

1.20

0.55

0.60

0.83

0.40

22.73

39.33

1.50

35.57

13.26avg.

Deviation

Standard 

102.63

7.00

7.78

8.49

6.81

6.08

250.86

564.38

19.80

164.51

113.83avg.

Standard Surface Area @ 1210 El. Total Fish 7 Zone +7- Ra

173.02 

11.80

34.73 

37.88 

11.48 

31.57 

422.91 

951.46

88.39

277.34 

204.06 avg.

121.41

2922.74 872925 +7- 58

10329.16 41317 +7- 10

1190.22 9918 +7-1

16021.67 96130 +7- 19

5163.16 28397 +7- 5

645.90 7751 +7- 

4038.10 1588319 +7- 396

3461.00 786801 +7- 150

2983.45 44752 +7- 8

12801.47 4553057 +7- 421

59678 Total 8029366 +7- 10726790 

M11

M10

M09

M08

M07

M06

M05

M04

M03

M02

M01

Site# Transects

A

22

542

0

0

0

95

80

19

9

78

Mean

B

8

730

5

13

0

3

29

94

42

5

84

C Fish/ha

699

0

2

1

11

20

84

25

132

15

657

0

1

5

2

48

86

29

8

98

86 avg.

Biomass Standard Standard Surface Area @ 1210 El.

Kg/ha Deviation Confidence Level Hectares

15.00

657.00

1.00

5.00

2.00

48.00

86.00

28.67

8.33

98.00

94.90 avg.

9.90

100.79

0.00

1.73

7.00

2.65

11.93

7.21

40.95

3.06

29.60

19.53 avg.

44.20

169.92

4.46

11.80

0.00

2.92

69.04

12.16

20.11

5.15

49.90

35.42 avg.

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

2983.45

3461.00

4038.10

12801.47

59678 Total

1210 El. Total Fish / Zone +/- Ran

1821 +/- 

1920240 +/- 54

20658 +/-4

5951 +/- 1

16022 +/- 4

18518 +/- 1

347276 +/- 5

166128 +/- 25

24852 +/- 1

1254544 +/- 69

3776011 +/- 1693676 

Average Fish Weight = 0.1kg 

Average Fish Length = 22.4 cm 

Confidence Level = 0.90
Lake Mead - Pelagic Fish Study - ECHO-INTEGRATION 

May-96

M11

M10

M09

M08

M07

M06

M05

M04

M03

M02

M01

Site# Transects

A

12

34

10

91

71

6

23

9

272

75

18

Mean Biomass

B

9

287

40

43

9

9

46

6

223

1

70

C Fish/ha Kg/ha

105

5

36

31

9

2

21

434

31

10

40.00

161.00

19.00

35.00

19.33

5.67

12.00

26.00

309.67

9.67

58.67

63.27 avg.

4.00

16.10

1.20

2.60

0.57

1.90

3.50

1.93

30.97

5.86

0.96

6.33 avg.

Standard Standard Surface Area @ 1210 El. Total Fish 7 Zone +7- R

Deviation Confidence Level Hectares

43.84

109.34

20.65

4.58

14.80

3.51

18.68

7.94

110.43

8.50

24.09

33.31 avg.

184.34

195.73

34.81

7.73

24.95

5.92

13.38

31.49

186.17

40.61

14.34

67.22 avg.

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

2983.45

3461.00

4038.10

12801.47

59678 Total

4856 +

470561 +7- 

199663 +7- 

41658 +7- 

304412 +7- 

29275 +7- 

16793 +7- 

48457 +7- 

1071768 +7- 

28850 +7- 

751062 +7- 

2967355 +7- 2881 02

Average Fish Weight = 0.1kg 

Average Fish Length = 22.4 cm 

Confidence Level = 0.90

Lake Mead - Pelagic Fish Study - ECHO-INTEGRATION 

Aug-96

M11

M10

M09

M08

M07

M06

M05

M04

M03

M02

M01

Site# Transects

A

172

170

716

216

21

234

80

813

212

24

143

Mean Biomass

B

333

1087

114

500

67

73

28

808

296

73

100

C

616

276

457

78

155

71

845

324

72

146

Fish/ha Kg/ha

300.67

315.33

753.33

274.50

42.33

154.00

72.67

822.00

277.33

56.33

129.67

290.74 avg.

30.07

31.53

75.33

27.45

4.23

15.40

7.27

82.20

27.73

5.63

12.97

29.07 avg.

Standard Standard Surface Area @ 1210 El.

Deviation Confidence Level Hectares

82.73

274.62

168.48

316.65

80.50

31.09

6.66

25.74

28.01

20.07

58.29

99.35 avg.

462.97

284.03

533.83

369.35

52.41

135.72

43.39

47.21

33.84

98.26

11.23

188.38 avg.

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

2983.45

3461.00

4038.10

12801.47

59678 Total

Average Fish Weight = 0.1kg 

Average Fish Length = 22.4 cm 

Confidence Level = 0.90

Total Fish 7 Zone +7- 

33327 +7

3257094 

2201788+7-1

+7- 3

357863 +7- 

795127+7-

678197+7-

46938 +

2844942+7-

1119886+7-

168058+7-

1659967+7-

13163186 +7- 8929654 
Lake Mead - Pelagic Fish Study - ECHO-INTEGRATION 

May-97

M11

M10

M09

M08

M07

M06

M05

M04

M03

M02

M01

Site# Transects

A

0

11

1

1

0

25

196

19

50

Mean

11

B

139

2

0

0

7

0

13

117

7

17

Biomass Standard Standard Surface Area @ 1210 El.

C Fish/ha Kg/ha Deviation Confidence Level Hectares

108

9

9

1

0

20

5

19

5.50

86.00

4.00

0.67

0.00

7.00

0.00

15.67

111.00

18.33

20.67

24.44 avg.

1.57

0.40

0.07

0.70

8.60

0.55

11.10

1.83

2.07

2.99 avg.

7.78

66.78

8.33

4.36

0.58

0.00

0.00

0.00

25.42

88.15

1.15

18.41 avg.

34.73

112.57

0

0

7.35

0.97

14.04

148.61

42.86

1.95

36.31 avg.

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

2983.45

3461.00

4038.10

12801.47

59678 Total

Average Fish Weight = 0.1kg 

Average Fish Length = 22.4 cm 

Confidence Level = 0.90

Lake Mead - Pelagic Fish Study - ECHO-INTEGRATION 

Aug-97

M11

M10

M09

M08

M07

M06

M05

M04

M03

M02

M01

Site# Transects

A

511

3254

20

14

79

23

391

228

119

5

76

B

549

2246

43

434

79

35

26

212

1490

35

53

C

3256

47

718

58

2

5

576

215

31

26

Fish/ha

Mean

530.00

2918.67

37.67

410.33

66.67

20.00

32.67

819.00

218.33

47.33

28.00

466.24 avg.

Kg/ha

Biomass

53.00

291.87

3.77

41.03

6.67

2.00

3.27

81.90

21.83

4.73

2.80

46.62 avg.

Standard Standard Surface Area @ 1210 El.

Deviation Confidence Level Hectares

26.87

582.55

12.86

320.16

59.47

15.00

22.74

8.50

588.42

24.91

24.06

153.23 avg.

982.09

119.96

21.68

539.74

25.29

38.34

100.25

14.34

991.99

41.99

40.57

265. 11 avg.

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

2983.45

3461.00

4038.10

12801.47

59678 Total

Average Fish Weight = 0.1kg 

Average Fish Length = 22.4 cm 

Confidence Level = 0.90

Total Fish 7 Zone +7- R

668+7

251356 +7- 3

8332 +7

2584+7

3442+7

63264 +7- 

384171 +7-6

234693 

61658+7-1

+7- 

1010167 +7-122767

64347+7

8530601 +7-2

389068 +7- 2

488383 +7- 7

523380 +7- 7

103263+7-1

43060 +7- 

881638+7-

2834559 +7- 38

83537+7-1

605936+7-5

14547773 +7- 948763
Lake Mead - Pelagic Fish Study - ECHO-INTEGRATION 

Oct-97

M11

M10

M09

M08

M07

M06

M05

M04

M03

M02

M01

Site# Transects 

A

0

29

6

1

72

280

159

64

B

0

43

0

0

49

19

154

554

138

C

435

2

5

39

407

213

70

Fish/ha

Mean 

0.00

169.00

9.00

2.50

0.50

53.33

413.67

170.00

96.00

101.56avg.

Kg/ha

Biomass 

16.90

5.33

0.90

0.25

0.05

41.37

17.00

9.60

11.43avg.

Standard Standard Surface Area @ 1210 El. 

Deviation Confidence Level Hectares

230.47

8.89

3.54

0.71

38.69

16.92

137.12

50.32

60.83 avg.

0

388.54

3.16

65.23

28.53

14.98

15.78

231.17

84.83

104.03 avg.

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

2983.45

3461.00

4038.10

12801.47

59678 Total

Average Fish Weight = 0.1kg 

Average Fish Length = 22.4 cm 

Confidence Level = 0.90

Lake Mead - Pelagic Fish Study - ECHO-INTEGRATION 

Jan-98

493943+7- 12

5165+/-1

2975 +/

46468 +/- 

34448+7-2

686477 +/- 3

1431712+7-9

1228941 +7- 11

3930129 +7- 3744583 

Site # Transects 

A

M11

M10

M09

M08

M07

M06

M05

M04

M03

M02

M01

34

0

4

14

2

12

47

55

20

27

B

1

0

6

34

11

156

6

Mean Biomass 

C Fish/ha Kg/ha

27

4

0

80

43

1

29.33

2.00

7.50

5.00

94.33

44.00

11.67

6.33

25.02 avg.

0.63

9.43

4.40

1.17

0.20

0.75

0.50

2.93

2.50 avg.

Standard Standard Surface Area @ 1210 El. 

Deviation Confidence Level Hectares

8.02

9.19

1.41

4.04

55.90

10.54

5.51

13.51 avg.

6.31

6.81

94.23

17.76

13.52

41.04

9.28

26.99 avg.

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

2983.45

3461.00

4038.10

12801.47

59678 Total

1210 El. Total Fish 7 Zone +7- R

Average Fish Weight = 0.1kg 

Average Fish Length = 22.4 cm 

Confidence Level = 0.90

85734 +/- 

51646+7-2

120163+7-2

7536+7-1

177676+7-

326488 +/- 3

81076+7- 1

107580+7-123241 
APPENDIX H

FISH SIZE AND DEPTH DISTRIBUTION

Inflow Areas For: 

August 1996 and 1997

377
LakePowell May 1996 

P08A

20

Fish Size Distribution

60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB) 

Fish Depth Distribution

« 9

ra

* 13 

17

0% 20% 40% 60% 80% 100% 120%

% of total

378
LakePowell May 1996 

P08B

Fish Size Distribution

20 60

25% 

20%

| 15% + 

° 10% 2?

5% 

0%

Fish Size Frequency

nn

rf- M

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

20% 40% 60% 

% of total

80% 100%

379
LakePowell May 1996 

P08C

Fish Size Distribution

25 J

20 25 30 35 40 

size (dB)

45 50

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 30% 40% 50%

% of total

60%

380
LakePowell May 1996 

P14A

Fish Size Distribution

20

_ 10% 

o 8%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 5% 10% 15% 20% 25%

% of total

30% 35%

381
LakePowell May 1996 

P14B

Fish Size Distribution

20

20%

15% 

ra

S. 10% 

o

" x

5% 

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 5% 10% 15% 20% 25% 30%

% of total

35%

382
LakePowell May 1996 

P14C

Fish Size Distribution

20 60

30%

25%

4-1

« 20%

£ 15% 

^ 10%

5% 

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB) 

Fish Depth Distribution

0% 10% 20% 30% 40% 50% 60% 70%

% of total

383
LakePowell August 1996 

P08A

Fish Size Distribution

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

A -. ,

5

£ 9

" 13

17

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50% 60%

384
LakePowell August 1996 

P08B

Fish Size Distribution

o

5

« 10

2

w 15

20

25

30 40 

size (dB)

50 60

o 20% 

o 15%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 30% 40% 50%

% of total

60% 70%

385
LakePowell August 1996 

P08C

Fish Size Distribution

20 60

35% 

30%

n 25% 

| 20%

o 15%

^ 10%

5%

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 30% 40% 50% 60%

% of total

70%

386
Lake Powell August 1996 

P14A

Fish Size Distribution

re

20 60

30% 

25%

* »re 20%

£ 15% 

o

5? 10%

5% 

0%

Fish Size Frequency

ffl

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

20% 40% 

% of total

60% 80%

387
Lake Powell August 1996 

P14B

Fish Size Distribution

20 60

25%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

20% 40% 

% of total

60% 80%

388
Lake Powell August 1996 

P14C

Fish Size Distribution

20 60

30%

25%

« 20%

£ 15%

;£ 10%

5%

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

20% 40% 

% of total

60% 80%

389
Lake Powell May 1997 

P08A

Fish Size Distribution

60

25%

20%

15%

10%

5%

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 30% 40% 50%

% of total

60% 70%

390
LakePowell May 1997 

P08B

Fish Size Distribution

20

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

5 9 

£

* 13 

17

Fish Depth Distribution

0% 5% 10% 15% 20% 25% 30%

% of total

35%

391
LakePowell May 1997 

P08C

Fish Size Distribution

20 30 40 50 

size (dB)

60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

1

5

5 9

5

" 13 

17

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

392
Lake Powell May 1997 

P14A

Fish Size Distribution

20 60

50%

40%

 § 30% *J

° 20% 

S?

10% 

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 30% 40% 50% 60% 

% of total

70%

393
LakePowell May 1997 

P14B

Fish Size Distribution

20 25 30 35 40

size (dB)

45 50

120% 

100%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 20% 40% 60%

% of total

80% 100% 120%

394
LakePowell May 1997 

P14C

Fish Size Distribution

20

Fish Size Frequency

\J /O 

f\O/ Uvo

U /o

f\O/

no/. U /o 

no/.

no/.

«Sifo,. «.«««««» ;EEiEE",E -ii S ^-S S=

; -

^" ^^i^-^iSvM ::'- >S>S ^i S ^ '

--->

?s

?:

? : v

I

[

"

;

,

:"' "

;

iff

"zrir. i

: ____ J

r z_ji

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 30% 40%

% of total

50% 60%

395
Lake Powell August 1997 

P08A

Fish Size Distribution

20 60

25%

20%

15%

10%

5%

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

£ 9

2

* 13 

17

Fish Depth Distribution

ts i 

SO: 1 

f==>' |

1

i : 

i

i*

0% 10% 20% 30% 40% 50% 60%

% of total

70%

396
LakePowell August 1997 

P08B

Fish Size Distribution

20

25% 

20%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

* 9

5

" 13 

17

0%

Fish Depth Distribution

20% 40% 60% 

% of total

80% 100%

397
LakePowell August 1997 

P08C

Fish Size Distribution

0

5

10

15

20

25

20 30 40 

size (dB)

50 60

20%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

S 9

2

* 13 

17

Fish Depth Distribution

0% 10% 20% 30% 40% 50% 60% 

% of total

70%

398
LakePowell August 1997 

P14A

Fish Size Distribution

20

25%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB) 

Fish Depth Distribution

« 9 

S.

* 13 

17

0% 10% 20% 30% 40% 50% 60%

% of total

399
LakePowell August 1997 

P14B

Fish Size Distribution

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

5

9

13 :! 

17

0%

Fish Depth Distribution

10% 20% 30% 40% 50% 60% 

% of total

400
LakePowell August 1997 

P14C

Fish Size Distribution

25

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

20% 40% 

% of total

60% 80%

401
Lake Mead May 1996 

M02A

Fish Size Distribution

20 60

30%

25%

4->

re 20%

£. 15% 

o

5? 10% 

5% 

0%

Fish Size Frequency

JiL JLC£ l#£fgt

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

402
Lake Mead May 1996 

M02B

0 ^ 

5

m _ Af\ 10

S ^i <i c

20

OK _

^.O r

2

oejo/

20°/<

o i o/(

* »

° 10°X

5?

KO/ o / 

o°x

1 :

5 :

 9 : 

2

" 13: 

17 :

0

Fish Size Distribution

3 ..Jfe * A " A *^^B!

3 * fr fl« ft 9 * Max

^1 Average

H AMin

^H f^ Tr^ , " ~r^ir^"ijrziiJ(

D 30 40 50 60 

size (dB)

Fish Size Frequency

J p^^tMS^i^ka^^^wg^-Jgfi^K^aaS^^^ "\-^i ^^^^S£^bMs!ai^l^?^

1 J

1 - .. ..... ..... . =?; ?i 5-: I-SB<FS.t :^.-jvx-^J

=i - :V: _ I"! f:; i»^ => ;-£ " : > j1 : . :: -;' * ' : iiti^J

) ft* &*&**»* 0 :? -^ SH -:JX -^ ' -H "iS>1 ^| «" Njp ' j

S Si si ^ ^- :; ^ "ft : 1 S i. i

1 ~' n;: 'i ; !' ';i| ;

j r .. fi ; ^'^- ^ ; --> ' ^ ? ' " 1 ... , n nnin r ! i,:.. \ '-: Wgfim'&K- 'Ml &F-3&* ?£i *;^ 3SSS ^^i = ; ::j--j |-| j'ifi&&-.CWl.Saif m ":s:J ' 1" : -:-|-- ) ^S: ^ ' ' -W" ^" ";:.:"- ^V :- -ft >" -?'- : . ' -" : ==:

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

1 l! V -.' ] :l ]

i !; fi- r ; ; ;

1 M i* ;|i : ' -i 

^ !| ll !| 1 -1 j

I : : 1! ? : i

$pf j, --,-,,-:::.,::,,:! tg:,:^ ^ijS. --,;-J?-: :: . f] = :: , : j!..,..^,., .,-,..:,.,.. J BWi^ . ..... .. .,. , ?

% 10% 20% 30% 40% 50% 60% 

% of total

403
Lake Mead May 1996 

M02C

Fish Size Distribution

20 60

Fish Size Frequency

20%

15% 

n

~ 10% 

o

^ 5%

0% P r^-i

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 

% of total

30% 40%

404
Lake Mead May 1996 

M09A

Fish Size Distribution

60

35%

30%

_ 25%

o 20%

o 15%

^ 10%

5%

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

1

5

5 9

TO

* 13 

17

0%

Fish Depth Distribution

20% 40% 

% of total

60% 80%

405
Lake Mead May 1996 

M09B

Fish Size Distribution

25

20 60

30%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

1

5

9

13

17

0%

Fish Depth Distribution

20% 40% 

% of total

60% 80%

406
Lake Mead May 1996 

M09C

Fish Size Distribution

20 60

35%

30%

_ 25%

o 20%

o 15%

^ 10%

5%

0%

Fish Size Frequency

n

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB) 

Fish Depth Distribution

0% 10% 20% 30% 40% 50% 60% 70%

% of total

407
Lake Mead May 1996 

M11 A

Fish Size Distribution

20 60

20%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

re Q

S

5 13

17

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

408
Lake Mead May 1996 

M11 B

Fish Size Distribution

CQ

20 60

20%

_ 15%

re* 

£ 10% 

o

ss

5% 

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

9 i

13

17 iz

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

409
Lake Mead May 1996 

M11 C

Fish Size Distribution

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50% 60%

410
Lake Mead August 1996 

M02A

0 -,

*i H c

20

or;

^.O i

2

?n°/

P*!0/

^w /<

T= On°yi

4-1

** 1^°X

o VP -in0/!

QX 1 W /'

5°/ 

0°/

1 :

5 :

5 9 :

SS *-

w 13 : 

17 :

0

i

f

0

3

ps 

J 

a

%

Fish Size Distribution

ririp : ^ |* ^^ 4H|

 * ife:: »- j| - |

1 " 5fl

i ^^^^s^^., ..,..,. . : ...,,,, . ,,,jJH

,^_T^^, « , _ ,,.,*_, - .. ,^_«JB

30 40 50 60 

size (dB)

Fish Size Frequency

^ ««^^^2^M^*^^ ^jj

; '""""" a:ii a a *

I '" '

tr-;^__......«.n.Ji:t:

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 !

size (dB)

Fish Depth Distribution

» -i :|: !

^ t : ^ _ ; v-

* 1 

1 ^1 s 1

10% 20% 30% 40% 

% of total

 Max 

 Average

AMin

^^. ...... j|| _,j.

fl! n|

H ; !c ; I

fW s r <: ! 1

uHiii

52 54 56 58

1

50%

411
Lake Mead August 1996 

M02B

Fish Size Distribution

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 30%

% of total

40% 50% 60%

412
Lake Mead August 1996 

M02C

Fish Size Distribution

20 60

20%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

13

17

0%

Fish Depth Distribution

10% 20% 

% of total

30% 40%

413
Lake Mead August 1996 

M09A

0 m

5 !

ro 10 -I?

+ « & 

n i

 ji /) c ')

20 |

oc _|

20

35% 

30% 

_ 25% 

o 20% 

o 15% 

^ 10% 

5% 

0%

1 |

* : ^

O _|

re Q -- jz y c

re -p

** - 1

" 13 :| -i|

Fish Size Distribution

fjfa r ij* %" i;J III

 pv KE ?S ......... ... a ... ..................... .,.,. . - Jg^" -,; - .-.-U.^-.i.,.. ,.,-¥. ..^jj^j .

g *Max

 Average

^

1 AMin

j

^

30 40 50 60 

size (dB)

Fish Size Frequency

e"

: ^f ' -> :< s:s^ =-:-[ :

E

:= Kl :,..- i- V^v:

' : ' '"'" " " " """ " ':E 

..SI... . ...A..... .,..,. .,..MM;-; , ................ ., .... .....,-.. ................ :r»i ^ - ^- Mll -!ji-«LS^s» ._..-L;

_ -,,,-,.^1

5 . " ;-;"- _:

 °'"!"!"1UWS if-' ' ' -, 'A 

....f-rj^ M . ,., ;i. i

;| :y :N ::^|

; m : ;:i|

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

 1 ;, 1

i i i ! " 

0% 20% 40% 60% 

% of total

^

80%

414
Lake Mead August 1996 

M09B

0

c;

_, 4f\

2

*J j _. w 15

20

OK^O

2

^n°/

9^°/

^.\J /(

re 20°X 

*" 1S°y5

o 

>s in0/

O^ 1 w /I

5°X 

no/

1

5

5 9 

2

" 13 

17

0

Fish Size Distribution

i i^^^f v " A *;ll *i^^|

; dB

; .. , ......... .. ^^^« A Mav : .. . v: .. . ..... .... =.:-.... .... . .... .^ -?--5... ..< >.... ........ - ? - - vS-;-~s:-: s-: ^' : | ^ IVIOA

1 Average

____ag ,l5, J.«.. ____^ A Mjn

HH

.... ......................................... ~"^".^

D 30 40 50 60 

size (dB)

Fish Size Frequency

; "n*

) ;. '. '.""'"" ...,,,,,,,,,,,,,,,.,....,..................^..... ............................... ; . ....... , _

 .....,.. .,.. ,..,......,.. ._._..................A...........3!........ .....^ ss. .,.,.,., ,,..,...,...,,.3:.....,.,..,. . ........-......*...,........., ..................... .^.jt.....,... ;j. ... i ,,! 

^....-»... . . . ._.......,. ... . ......... . ...... ....................... .........w_.... ^. ^ ............... .... .K ... ..... K-.K.J.. . . -t

L ' ;! .1

Liii^niiiiiiiiiiiniiJ^ ' - vviiiiiiiMMiiiiiiii^iMiiiiiiiiiiiiiii^iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiniiimiM iiuuiiiiiiiiiiiiiiiiiiiiiiiiiiiiirniiniJSSiuiii-i................ .i-iSi'ift* ' . fr . H K

}

! ,. ... ,>,,,..,....,..,, .f-i .. ; ,''.' .,-....'. '-.',. y- ' - - - - _ ,;| i-^ ;: _^.: ^ . . , . 

: I i * --; '' ' ' ' '

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

- ----' -r ~- !.IIL!ILII.IIL!I.IUI..y I : » !

f» : | K

% 20% 40% 60% 80% 

% of total

415
Lake Mead August 1996 

M09C

Fish Size Distribution

60

35% R

_ 25% 

5

o 15%

5% Urgr ^

0% *

Fish Size Frequency

i£] I

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20%

1

30% 40% 50% 60% 

% of total

70%

416
Lake Mead August 1996 

M11 A

Fish Size Distribution

20 60

20%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

.............j;

llillfmmlllti

" 13 

17

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

417
Lake Mead August 1996 

M11 B

Fish Size Distribution

W A ^::-

gs » ^A ?: : . x A w, i? 

 , ^f » ** % 

20 60

20% 

15%

(0

10% 

o

^ 5%

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

418
Lake Mead August 1996 

M11 C

!i

« 10%-

w K

£ 15 L.

20

20% -J

1 *^o/

2

O

° O ^%/O 

f|0/

-

_ = 

O =>

_ ri =S? Cu IJ ^3 * * ££

 - C

" 13 E 

17 J

0%

Fish Size Distribution

 T^'T^ y ^w * * H f * * f *

^

_ .fr__i i --,-^jii

*Max 

 Average 

AMin

30 40 50 60 

size (dB)

Fish Size Frequency

" ?! ' "

||||||||ii|jilip^

M..,,,»?=......,,..,*;,..,,.;:,,,,.,, -. ,,. ........... .,. , . . .,.., .,..,.., ......,......,.....,..,.. :. ...........,- , , . .,-., , -,-,--, ...,..,. ..,..... .u.,..,.,,,,,,,.. , fl

| n '?:-_ri

1_..J.,,__ ...... ......_....n.,!ft ,0,^J ;k:|. :: ..

-mass' ssSsisSsifiss^l

\ h : , 1 y.

 : . ; >: <

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

^^__K,,Trm_,. * 1 ssMig! 1 :*mASi^q<WMk"''*£*E&ZSggl

EOR ^ - - ^

' =-.

Si' " " s S| |

':! j i

: !

1 f

f I '

 : '^-- '£ - ~£P ?" '^^ -*: i ^:?oj- X* 5=. j^- i -i:' - * - :-. : >. : * ^:

 i:^

3

10% 20% 30% 40% 50% 60% 

% of total

419
Lake Mead May 1997 

M02A

0 ,

K

_ Af) jS 1U 

 £ 15

20

OK^«J

2(

ono/

OCO/

^ 20°/ 

* ' 1*S°/

0

>P 10°/

0s* 1 \J /(

'S0/

«J /(

0°/

1 :

5 :

« 9 : 

£

* 13 : 

17 :

0

Fish Size Distribution

[ * m i* » 11

i * '" j

u,s,.i.A.juRS?.,.,... ........ . .... , .^ i^irt MjjS^i-'- ---:s-----^ -- .. .- .jjj^jftjs -s ^^H^^l Max

| ^^^1 * Average

[_.,._ ,.,.. 

D 30 40 50 60 

size (dB)

Fish Size Frequency

1 - -.y*^w--n«r-«««|

'\ * ~\ \ I ' '**

J j ..^- ,- - « -, : ^ v ? j||

:

%- ?z '" -? - =s =" -=: «'=; ,-=: ,-f l-{]-^- ^.j.^:^:;; ;" *<- < j;,^ - : ;s- ":

:

i s? *E ££-:-% -^ ?: =: -: :-f ::: :-:: ::- :^:: *-S^K- ^ i-sss ^' >- ; ^

* p;;; ;; ¥ 3W5flte *. ^ * . . .;- s ;:- ' ; ;

i. -^^ .^.^ j. ff -^ 

j - NnfTi- Tnrr ' 1'iiTIWlipf pf^lipf^ W jhin4 , c^,,^ rW.'l-U. fti Hit Fi«H20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

gpss

?' -j ? -J 

i ;| i "1

i J :;! i ^

1 ^: : ^ 

ii ^ i i:^

^ * .. j fe : :: -s »

1 ~ ^ 1 .1

i . « ! 1 ii, ... ,.. ...... , . i; .......... ~^

% 10% 20% 30% 40% 50% 

% of total

420
Lake Mead May 1997 

M02B

Fish Size Distribution

20 60

30%

25%

]§ 20%

£ 15% 

o

;£ 10%

5% 

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

ro Q

i

* 13 

17

Fish Depth Distribution

0% 10% 20% 30% 40% 50%

% of total

60%

421
Lake Mead May 1997 

M02C

20

Fish Size Distribution

60

25% 

20%

 § 15% + >

*° 10% 

^

5% 

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB) 

Fish Depth Distribution

9

13

17

0% 10% 20% 30% 40% 50% 60%

% of total

422
Lake Mead May 1997 

M09A

Fish Size Distribution

20 60

20%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

42 9

2

* 13 

17

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

423
Lake Mead May 1997 

M09B

Fish Size Distribution

20

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

10% 20% 30% 40% 

% of total

50% 60%

424
Lake Mead May 1997 

M09C

Fish Size Distribution

20 60

0% l

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

« Q

2

5 13

17

0%

Fish Depth Distribution

20% 40% 

% of total

60% 80%

425
Lake Mead May 1997 

M11 A

Fish Size Distribution

20

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

426
Lake Mead May 1997 

M11 B

Fish Size Distribution

25

20 60

25% 

20% 

15% 

10% Fit

5% I

0%

Fish Size Frequency

D

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

427
Lake Mead May 1997 

M11 C

Fish Size Distribution

20

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

1

5

co 9 

3 y

* 13 

17

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

428
Lake Mead August 1997 

M02A

Fish Size Distribution

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

429
Lake Mead August 1997 

M02B

Fish Size Distribution

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

1

5

« 9 

£

" 13 

17

Fish Depth Distribution

0% 10% 20% 30% 40%

% of total

50% 60%

430
Lake Mead August 1997 

M02C

Fish Size Distribution

20 60

25%

20%

5 15% 4->

° 10% 

5?

5% 

0%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

Fish Depth Distribution

0% 10% 20% 30% 

% of total

40% 50% 60%

431
Lake Mead August 1997 

M09A

Fish Size Distribution

20 60

r 10%

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

SSSS3

« 9 

2

" 13 

17

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

432
Lake Mead August 1997 

M09B

Fish Size Distribution

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

1

5

2 9 

S

135 13

17

Fish Depth Distribution

 -JU--

0% 10% 20% 30% 40% 50%

% of total

60%

433
Lake Mead August 1997 

M09C

Fish Size Distribution

25

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

1

5

W Q

s

" 13 

17

0%

Fish Depth Distribution

20% 40% 

% of total

60% 80%

434
Lake Mead August 1997 

M11 A

Fish Size Distribution

20

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

435
Lake Mead August 1997 

M11 B

Fish Size Distribution

20 60

25% 

20% 

15% 

10% 

5%

Fish Size Frequency

0% &

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

436
Lake Mead August 1997 

M11 C

Fish Size Distribution

20 60

Fish Size Frequency

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56

size (dB)

0%

Fish Depth Distribution

10% 20% 30% 

% of total

40% 50%

437
APPENDIX I

ECHO-COUNTING ANALYSIS 

FISH DENSITY DATA AND STATISTICS

438
Lake Powell Pelagic Fish Study 

1995- November

ECHO-COUNTING

Lake Segment #

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

P11

P12

P13

P14

Transects

A

0.2

11.6

60.3

751.3

128.5

110.3

317

850.5

687.7

1074.7

B

0.84

0.5

10.8

96.6

105.7

567.1

69.8

193.7

522.2

666.7

1182.5

976.3

C

1.6

2.1

19.5

61.4

6.8

403.1

153.9

176.5

436.3

1990.2

1435.5

Mean

Fish/ ha.

1.22

0.93

13.97

72.77

56.25

573.83

99.15

152.63

338.57

651.17

1286.8

1162.17

367.45 avg.

Standard

Deviation

0.38

0.59

2.78

11.92

49.45

100.57

29.35

24.08

100.38

119.82

379.6

139.6

79.88 avg.

Surface Area @ 3700 El.

Hectares

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.90

1583.65

5264.42

6150.90

4424.08

4353.64

2889.24

63894 Total

Lake Powell Pelagic Fish Study

1996- January

ECHO-COUNTING

Lake Segment #

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

P11

P12

P13

P14

Transects

A

18.62

12.28

5041 .52

0

69.54

41.64

69.62

69.63

505.74

80.93

440.91

1047.74

B

44.35

0

6407.37

11.09

624.39

22.75

61.73

46.11

354.99

188.32

1804.66

C

13.15

3391.19

7.69

94.92

27.93

100.73

315

48.68

87.04

2423.43

Mean

Fish/ ha.

31.48

8.48

4946.69

6.26

262.95

30.77

65.67

72.16

391.91

64.8

238.76

1758.61

Standard

Deviation

18.19

7.35

1510.32

5.68

313.27

9.76

5.58

27.4

100.59

22.8

182.25

689

Surface Area @ 3700 El.

Hectares

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.90

1583.65

5264.42

6150.90

4424.08

4353.64

2889.24

656.54 avg. 241.02 avg. 63894 Total 
Lake Powell Pelagic Fish Study 

1996 -May 

ECHO-COUNTING 

Transects

Lake Segment # A B

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

P11

P12

P13

P14

6.8

16.9

365.3

175.4

27.4

0

24.7

29.1

76.6

7.3

32.6

5.3

421.1

870.6

C

795.8

11

1075.3

23.9

232.8

47.4

0.7

13.7

53.5

6.7

139.1

27.3

24.8

294.2

Mean Standard Surface Area @ 3700 

Fish 7 ha. Deviation Hectares 

287.3

30.2

1942.3

82.7

170.2

90.1

0

24.4

0

81.3

11.9

70.6

448.3

363.3

19.37

1127.63

94

143.47

45.83

8.47

22.4

65.05

4.67

84.33

14.83

172.17

537.7

230.91

5.68

456

44.1

60.78

26.02

8.12

4.56

11.55

2.34

30.78

6.52

125.17

172.29

219.

3032.

7175.

16520.

6019.

1905.

2265.

2087.

1583.

5264.

6150.

4424.

4353.

2889.

193.1 avg. 84.63 avg.

Lake Powell Pelagic 

1996-August 

ECHO-COUNTING

T

Lake Segment # A 

P01 

P02 

P03 

P04 

P05 

P06 

P07 

P08 

P09 

P10 

P11 

P12 

P13 

P14

Study

Mean Standard Surface Area @ 3700 

ansects Fish / ha. Deviation Hectares

B C

2892.5

4976.9

25380.1

24082.3

6675

3948.1

12453.2

41148.7

2301.6

47559.3

748.6

1993.1

37190.8

125601.2

3332.4

2090.8

33023.2

24039.8

7829.5

4787.8

10071.1

46392.5

3274.1

46220.8

620.4

2811.5

46628.3

117655.5

2777.8

2316.5

30564.3

20377.9

13104.3

6279.9

9505.9

62738.3

77696.1

610.8

4250.9

50421

130747.1

3000.9

3128.07

29655.87

22833.33

9202.93

5005.27

10676.73

50093.2

2787.85

57158.73

659.93

3018.5

44746.7

124667.9

169.02

926.71

2252.64

1227.78

1978.95

681.86

903.1

6501.25

486.25

10275.95

44.42

659.94

3933.4

3807.92

219.

3032.

7175.

16520.

6019.

1905.

2265.

2087.

1583.

5264.

6150.

4424.

4353.

2889.

63894 Tot

26188.3 avg. 2417.8 avg. 63894 Tot
Lake Powell Pelagic Fish Study 

1997-May

ECHO-COUNTING 

Transects

Lake Segment # A

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

P11

P12

P13

P14

Lake Powell Pelagic

1997- August

ECHO-COUNTING

14.68

0.82

17.14

0

8.05

0

5.44

39.57

10.96

2.81

0

111.75

406.54

25.6

Fish Study

B

1.45

7.24

0

7.97

7.93

666.73

12.08

5.32

0

151.14

244.2

0.49

C

0.38

14.02

0.21

0

22.07

18.72

64.16

14.52

0

218.42

291.65

151.37

Transects

Lake Segment # A

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

P11

P12

P13

P14

0.84

3.1

111.3

0.7

54.8

15.1

67.6

36746.5

25.1

25.4

141.3

44.7

9832.6

46353.2

B

80

19.7

2.3

11.9

0

26

20279.4

0.5

139.3

41.7

9225.6

49480.3

C

7.6

109.3

7.1

105.1

112.4

4.2

2966

240

219.1

4815.9

24171.2

Mean 

Fish /ha.

8.06

0.6

15.58

2.48

2.68

10.01

10.7

256.82

11.52

7.55

0

160.44

314.13

59.15

61.41 avg.

Mean

Fish /ha.

40.42

5.35

80.1

3.37

57.27

42.5

32.6

19997.3

12.8

25.4

173.53

101.83

7958.03

40001.57

Standard 

Deviation

9.35

0.31

2.21

4.12

4.65

11.17

7.06

355.2

0.79

6.16

0

53.94

83.47

80.84

44.23 avg.

Standard

Deviation

39.58

2.25

30.2

1.92

26.93

35.22

19

9752.61

12.3

0

33.24

58.64

1580.81

7966.5

Surface Area @ 3700 E

Hectares

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.90

1583.65

5264.42

6150.90

4424.08

4353.64

2889.24

63894 Tota

Surface Area @ 3700 E

Hectares

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.90

1583.65

5264.42

6150.90

4424.08

4353.64

2889.24

4895.15 avg. 1397.1 avg. 63894 Tota
Lake Powell Pelagic Fish Study 

1997- November 

ECHO-COUNTING

Transects

Lake Segment # A 

P01 1.33 

P02 15.07 

P03 64.14 

P04 4.55 

P05 13.21 

P06 4.08 

P07 3498.06 

P08 518.56 

P09 9.96 

P10 8.75 

P11 119.87 

P12 189.05 

P13 2208.17 

P14 1415.27

B

0

0.16

105.71

5.89

7.47

6.95

4440.92

455.76

9.56

26.52

248.51

254.61

2367.28

2564.56

C

1

113.67

3.11

12.96

8.14

11708.19

458.14

21.01

144.76

281.91

2251 .6

1676.19

Mean

Fish / ha.

0.66

5.41

94.5

4.52

11.21

6.39

6549.06

477.49

9.76

18.76

171.05

241 .86

2275.68

1885.34

Standard Surface Area (

Deviation Hectares

0.94

8.38

26.6

1.39

3.24

2.09

4492.74

35.59

0.28

9.1

68.23

47.72

82.24

602.51

® 3700 E

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.90

1583.65

5264.42

6150.90

4424.08

4353.64

2889.24

839.41 avg. 384.36 avg.

Lake Powell Pelagic Fish Study

1998- January

ECHO-COUNTING

Lake Segment #

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

P11

P12

P13

P14

Transects

A B

9.13

9.5

101.6

8.9

12.7

18.4

106.7

381.9

140.2

67.2

18.2

31.4

215.7

71.9

C

17.7

3.3

50.8

3.6

8.6

15.5

107.9

209.2

186

43.5

22.1

36.5

216.1

84.6

4.9

3.2

9.3

21.5

81.4

25.8

70.8

26.2

43.1

56.8

65.9

Mean

Fish /ha.

13.41

5.9

76.2

5.23

10.2

18.47

98.67

205.63

163.1

60.5

22.17

37

162.87

74.13

Standard

Deviation

4.28

1.86

25.4

1.84

1.27

1.73

8.64

102.81

22.9

8.56

2.31

3.4

53.03

5.51

Surface Area

Hectares

63894 Tota

3700 E

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.90

1583.65

5264.42

6150.90

4424.08

4353.64

2889.24

68.1 avg. 17.4 avg. 63894 Total 
Lake Mead Pelagic Fish Study 

1995 - November 

ECHO-COUNTING

Transects

Lake Segment # A B 

M01 12.3 0 

M02 22.5 39 

M03 3.7 2.7 

M04 45.8 

M05 0.3 7.2 

M06 0 0.3 

M07 9.5 1.9 

M08 56.8 14.8 

M09 1247 407.3 

M10 15.2 0.5 

M11 118 90.4

Mean Standard Surface Area @ 1210 El.

Fish / ha. Deviation Hectares

309.8

5.6

6.5

0

9.3

19.1

51.4

7.1

3

41.4

6.15

123.77

4

26.15

2.5

3.2

10.17

41

553.8

6.23

83.27

6.15

93.14

0.85

19.65

2.35

3.05

4.98

13.19

365.35

4.54

22.4

121.4

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

Tot

121.4

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

78.2 avg. 48.7 avg. 59678 Total 

Lake Mead Pelagic Fish Study 

1996-January 

ECHO-COUNTING

Transects

Lake Segment # A B 

M01 691.3 41.2 

M02 745.5 771.9 

M03 0 0 

M04 0 727.7 

M05 0 3.9 

M06 0.3 0 

M07 35.6 11.3 

M08 143.8 226.2 

M09 977.5 

M10 119.3 8.4 

M11 158.8 225.7

Mean Standard Surface Area @ 1 21 0 El.

Fish 7 ha. Deviation Hectares

352.2

0

0

1.1

211.9

660.7

59.7

196.4

366.25

623.2

0

242.57

1.95

0.1

16

193.97

819.1

62.47

193.63

325.05

135.71

0

242.57

1.95

0.1

10.23

25.42

158.4

32.04

19.36

121.4

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

Tot

229.02 avg. 86.44 avg. 59678 Total 
Lake Mead Pelagic Fish Study 

1996 -May 

ECHO-COUNTING 

Transects

Lake Segment #

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

M11

A

36.7

919.7

6.6

20.4

14.3

87.1

22

12.2

956.3

23.7

2379

B

17.4

586.2

63.3

11.1

8.2

9.6

134.6

21.8

1285.5

1.9

73.2

C

226.3

14.5

14.3

7.7

0.3

18.1

24.9

526.9

49.8

217.2

Mean 

Fish / ha.

27.05

577.4

28.13

15.27

10.07

32.33

58.23

19.63

922.9

25.13

889.8

236.9 avg.

Standard 

Deviation

9.65

200.22

17.73

2.73

2.12

27.51

38.2

3.82

219.62

13.85

745.76

11 6.47 avg.

Surface Area® 1210 El. 

Hectares

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461 .00

2983.45

12801.47

59678 Total

Lake Mead Pelagic Fish Study

1996 -August

ECHO-COUNTING

Lake Segment #

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

M11

Transects

A

529.92

11124.12

644.29

315.11

111.75

2946.43

299.98

1786.26

13777.44

230.87

1256.3

B

662.31

12919.14

1141.46

696.06

242.39

574.11

451.12

2650.19

8158.47

579.17

912.79

C

1024.52

752.56

2269.47

1259.63

1745.99

671.45

4519.61

695.74

1387.67

Mean

Fish / ha.

596.12

8355.93

846.1

1093.55

537.92

1755.51

474.18

2218.23

8818.51

501.93

1185.59

Standard

Deviation

93.61

6412.31

261.45

1036.04

628.42

1186.19

186.81

610.89

4664.07

241.87

245.21

Surface Area® 1210 El.

Hectares

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

Total F

Total # 

Total # 

2398.51 avg. 1415.17 avg. 59678 Total 
Lake Mead Pelagic Fish Study 

1 997 - May 

ECHO-COUNTING

Lake Segment #

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

M11

Transects

A B

0.62

90.59

0

0

0.31

4.6

11.06

1196.01

16.51

99.59

4.34

107.52

1.07

0

4.95

305.2

7.01

2350.22

8.8

181.38

C

279.46

0

0.21

0.49

0.04

13.93

10.15

542.25

3.44

0

Mean

Fish / ha.

2.48

159.19

0.36

0.07

0.49

1.77

107.91

9.41

1362.83

9.58

93.66

158.89avg.

Standard Surface Area

Deviation Hectares

2.63

104.5

0.62

0.12

NA

2.76

170.92

2.12

915.46

43.17

90.83

133.31 avg.

Lake Mead Pelagic Fish Study

1997 -August

ECHO-COUNTING

Lake Segment #

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

M11

Transects

A B

0.9

19455.76

52.86

27.74

127.68

121.84

60.56

1268.05

215.84

4.52

168.31

0

19381.77

11.91

553.3

143.85

30.04

710.53

2084.2

1802.65

253.86

110.92

C

6556.6

71.86

559.26

286.21

36.88

0.39

2719.71

3571 .45

151.46

163.5

Mean

Fish / ha.

0.45

15131.38

45.54

380.1

185.91

62.92

257.16

2024

1863.31

136.61

147.58

Standard Surface Area

Deviation Hectares

0.64

7426.07

30.64

305.17

87.23

51.14

393.78

727.7

1678.63

125.33

31.84

1210 El. Tota

Tota

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

59678 Total

1210 El. Tota

Tota

121.41 

2922.74 

10329.16 

1190.22 

16021.67 

5163.16 

645.90 

4038.10 

3461.00 

2983.45 

12801.47 

1839.54 avg. 987.11 avg. 59678 Total 
Lake Mead Pelagic Fish Study 

1997- November 

ECHO-COUNTING

Transects

Lake Segment # A

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

M11

Lake Mead Pelagic Fish

1998- January

ECHO-COUNTING

0.94

17.56

6.17

3.2

1.49

2.11

43.71

1498.46

324.84

0.81

479.32

Study

B

0.18

10.2

0.75

4.36

1.87

1.03

40.89

906.95

216.37

5.74

709.61

C

48.98

3.65

4

1.12

8

41.03

1147.08

217.94

1.08

791.34

Transects

Lake Segment # A

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

M11

2.6

86.8

10.8

2.1

0.6

5.3

30.3

152.5

183.7

23.1

B

1.2

91.3

17.3

1.6

1.0

2.5

18.5

125.4

119.8

16

C

65.8

0.4

15.0

103.5

3.8

Mean

Fish 7 ha.

0.56

25.58

3.52

3.85

1.49

3.71

41.88

1184.16

253.05

2.54

660.09

198.22 avg.

Mean

Fish 7 ha.

1.9

81.3

14.05

1.37

0.8

3.9

21.27

127.13

151.75

NA

14.3

Standard Surface Area

Deviation Hectares

0.54

20.6

2.71

0.59

0.37

3.75

1.59

297.5

62.18

2.77

161.8

50.4 avg.

Standard Surface Area

Deviation Hectares

0.7

7.86

3.25

0.5

0.2

1.4

4.63

14.17

31.95

NA

5.64

1210 El. Total F

Total # 

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

59678 Total

1210 El. Total F

Total # 

121.41

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

41.78 avg. 7.03 avg. 59678 Total 
APPENDIX J

LARGE FISH (>16 CM) ANALYSIS 

STRIPED BASS POPULATION ESTIMATES AND STATISTICS

447
Lake Powell Pelagic Fish Study

1996-August

ECHO-COUNTING -- LARGE FISH (>16 C Transects

Lake Segment # A

P01 

P02 

P03 

P04 

P05 

P06 

P07 

P08 

P09 

P10 

P11 

P12 

P13 

P14

sects (Fish/Ha.)

B

58.65

61

104.43

1.68

5.18

127.77

10.42

19.13

99.79

5.09

19.32

50.81

54.34

44.55

C

20.26

34.98

98.01

5.85

2.38

261.63

14.94

4.39

11.36

10.56

2.7

129.19

22.7

11.99

Mean Standard

Fish / Surface ha. Deviation

47.12

72.55

97.75

5.68

10.13

25.82

1.86

9.61

0

6.69

23.06

303.87

55.79

27.87

42

56

100

4

6

138

9

11

37

7

15

161

44

28

19.69

19.24

3.78

2.36

3.92

118.26

6.64

7.47

54.63

2.81

10.84

129.55

18.7

16.28

Surface Area @ 3700 El 

Hectares

:i.

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.90

1583.65

5264.42

6150.90

4424.08

4353.64

2889.24

Total #

Large Fish

9232

170376

718016

72690

35516

263761

20550

23050

58674

39220

92448

713560

192779

81303

Striped B

Total # S

47.16avg. 29.58 avg. 63894 Total 2491176 Total

Lake Powell Pelagic Fish Study

1997 -August

ECHO-COUNTING - LARGE FISH (>16 C Transects

Lake Segment # A

P01 

P02 

P03 

P04 

P05 

P06 

P07 

P08 

P09 

P10 

P11 

P12 

P13 

P14

isects (Fish/Ha.)

B

0.18

NA

98.57

0.72

54.21

13.46

23

24.81

8.63

17.93

46.56

18.73

554.61

260.74

C

0

3.05

5.59

2.25

7.55

0

12.06

13.99

0

NA

28.01

5.41

389.31

594.55

Mean Standard

Fish / Surface ha. Deviation

0

3.22

8.27

4.12

94.35

2.28

3.99

9.64

NA

NA

139.22

3.07

324.76

156.46

0.06

3.13

37.48

2.36

52.04

5.25

13.02

16.15

4.31

17.93

71.26

9.07

422.89

33725

0.1

0.12

52.92

1.7

43.44

7.2

9.54

7.81

6.1

NA

59.58

8.45

118.55

228.85

Surface Area @ 3700 El 

Hectares

I.

219.76

3032.68

7175.85

16520.51

6019.73

1905.65

2265.72

2087.90

1583.65

5264.42

6150.90

4424.08

4353.64

2889.24

Total #

Large Fish

13.18

9492.29

268950.86

38988.4

313266.75

10004.66

29499.67

33719.58

6825.53

94391.05

438313.13

40126.41

1841110.82

974396.19

Striped B

Total # St

70.87 avg. 41.87 avg. 63894 Total 4099098 Total

oo
Lake Mead Pelagic Fish Study

1996 - August

ECHO-COUNTING -- LARGE FISH (>16 C Transects

Lake Segment # A

M01 

M02 

M03 

M04 

M05 

M06 

M07 

M08 

M09 

M10 

M11

ects (Fish/Ha.)

B

1.57

1.34

0.91

0.83

1.82

27.08

1.85

6.72

10.34

0.09

10.32

C

3.58

18.42

4.31

1.54

1.68

2.44

2.55

2.07

4.48

36

1.52

Mean Standard

Fish / Surface ha. Deviation

NA

25.71

112.38

8.21

21.91

1.2

6.84

NA

56.88

4.53

2.02

2.57

15.16

39.2

3.53

8.47

10.24

3.75

4.39

23.9

13.54

4.62

1.42

12.51

63.4

4.07

11.64

14.6

2.7

3.29

28.71

19.58

4.94

Surface Area @ 1210 El 

Hectares

!l. Total #

Large Fish

121.4

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

312.02

44308.74

404903.07

4201.48

135703.54

52870.76

2422.12

17727.26

82717.89

40395.91

59142.79

Striped B

Total # S

11.76 avg. 15.17 avg. 59678 Total 844706 Total

Lake Mead Pelagic Fish Study

1997 -August

ECHO-COUNTING -- LARGE FISH (>16 C Transects

Lake Segment # A

M01 

M02 

M03 

M04 

M05 

M06 

M07 

M08 

M09 

M10 

M11

sects (Fish/Ha.)

B

0

77.96

0.77

0

1.48

3.44

17

46.94

103.89

0.54

16.3

C

0

131.07

7.17

5.4

1.03

5

7.06

74.06

412.03

0.66

10.66

Mean Standard Surface Area

Fish / Surface ha. Deviation Hectares

NA

167.79

0.95

19.87

0.14

0

0.39

47.46

99.3

8.95

16.02

0

125.61

2.96

8.42

0.88

2.81

8.15

56.15

205.07

3.38

14.33

0

45.16

3.64

10.27

0.68

2.56

8.36

15.51

179.24

4.82

3.18

1210 El!l. Total #

Large Fish

121.4

2922.74

10329.16

1190.22

16021.67

5163.16

645.90

4038.10

3461.00

2983.45

12801.47

0

287991.07

30574.31

10021.65

14099.07

14508.48

5264.08

226739.31

709747.27

10084.06

183445.06

Striped B

Total # S

38.89 avg. 24.86 avg. 59678 Total 1492474 Total

VO