U.S. Department of the Interior

U.S. Geological Survey

Data Series 89

Prepared in cooperation with the

California Regional Water Quality Control Board, Lahontan Region

Water-Quality Data for Selected Stream Sites in 

Bridgeport Valley, Mono County, California, 

April 2000 to June 2003
Cover. Water-quality sampling in Virginia Creek near Bridgeport, California. Photo by Gerald Rockwell, March 12, 2001.
Water-Quality Data for Selected Stream 

Sites in Bridgeport Valley, Mono County, 

California, April 2000 to June 2003

By Gerald L. Rockwell and Paul D. Honeywell

Prepared in cooperation with the 

California Regional Water Quality Control Board, Lahontan Region

Data Series 89

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

Gale A. Norton, Secretary

U.S. Geological Survey

Charles G. Groat, Director

U.S. Geological Survey, Reston, Virginia: 2004

For sale by U.S. Geological Survey, Information Services

Box 25286, Denver Federal Center

Denver, CO 80225

For more information about the USGS and its products:

Telephone: 1-888-ASK-USGS

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Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply 

endorsement by the U.S. Government.

Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

Rockwell, G.L., and Honeywell, P.D., 2004, Water-quality data for selected stream sites in Bridgeport Valley, Mono 

County, California, April 2000 to June 2003: U.S. Geological Survey Data Series 89, 35 p.
iii

Contents

Abstract ................................................................................................... 1

Introduction ................................................................................................ 1

Purpose and Scope ....................................................................................... 1

Methods of Study ....................................................................................... 3

Sampling Procedures .............................................................................. 3

Quality Assurance Procedures .................................................................. 3

Review of Data .......................................................................................... 3

Summary ................................................................................................... 4

References Cited .......................................................................................... 4

Figure

Figure 1. Maps showing location of the study area and sites in and near Bridgeport Valley, 

California, where water samples were collected, April 2000 to June 2003, study 

area and water-sample collection sites ................................................... 2

Tables

Table 1. Location of sites in and near Bridgeport Valley, California, where water-quality 

samples were collected, April 2000 to June 2003 .......................................... 8

Table 2. Site 1: Discharge, field measurements, and water-quality data for Buckeye Creek 

above Campground, near Bridgeport, California .......................................... 8

Table 3. Site 2: Discharge, field measurements, and water-quality data for Buckeye Creek 

near Bridgeport, California .................................................................. 9

Table 4. Site 3: Discharge, field measurements, and water-quality data for Buckeye Creek at 

Highway 395, near Bridgeport, California ................................................... 11

Table 5. Site 4: Discharge, field measurements, and water-quality data for Buckeye Creek at 

Bridgeport Reservoir, near Bridgeport, California ....................................... 13

Table 6. Site 5: Discharge, field measurements, and water-quality data for Swauger Creek 

near Bridgeport, California .................................................................. 15

Table 7. Site 6: Discharge, field measurements, and water-quality data for Robinson Creek 

below Barney Lake, near Bridgeport, California .......................................... 17

Table 8. Site 7: Discharge, field measurements, and water-quality data for Robinson Creek 

at Twin Lakes Outlet, near Bridgeport, California .......................................... 18

Table 9. Site 8: Discharge, field measurements, and water-quality data for Robinson Creek 

at Highway 395, near Bridgeport, California ................................................ 20

Table 10. Site 9: Discharge, field measurements, and water-quality data for Robinson Creek 

at Bridgeport Reservoir, near Bridgeport, California .................................... 22

Table 11. Site 10: Discharge, field measurements, and water-quality data for Green Creek 

above Campground, near Bridgeport, California .......................................... 24

Table 12. Site 11: Discharge, field measurements, and water-quality data for Green Creek 

near Bridgeport, California .................................................................. 25

Table 13. Site 12: Discharge, field measurements, and water-quality data for Virginia Creek 

at Conway Summit, near Lee Vining, California .......................................... 27
iv

Table 14. Site 13: Discharge, field measurements, and water-quality data for Virginia Creek 

near Bridgeport, California .................................................................. 28

Table 15. Site 14: Discharge, field measurements, and water-quality data for East Walker 

River at Bridgeport, California ............................................................... 30

Table 16. Site 15: Discharge, field measurements, and water-quality data for East Walker 

River near Bridgeport, California ............................................................ 32

Table 17. Quality-assurance data for field blanks collected in conjunction with water-quality 

samples in Bridgeport Valley, California ................................................... 34

Conversion Factors and Water-Quality Abbreviations

Multiply By To obtain

acre-foot (acre-ft) 1,233 cubic meter (m3)

cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)

foot (ft) 0.3048 meter (m)

inch (in.) 25.4 millimeter (mm)

mile (mi) 1.609 kilometer (km)

ton (T) 0.9072 metric ton

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F=(1.8×°C)+32

Temperature in degrees Fahrenheit (°F) may be converted to degrees Celsius (°C) as follows:

°C=(°F-32)/1.8

Vertical coordinate information is referenced to National Geodetic Vertical Datum of 1929 

(NGVD 29).

Horizontal coordinate information is referenced to North American Datum of 1983 (NAD 83).

Altitude, as used in this report, refers to distance above the vertical datum.

Water-Quality Abbreviations

μg/L, UG/L microgram per liter

μm, UM micrometer

μS/cm, US/CM microsiemens per centimeter at 25°C

LRL laboratory reporting level

mg/L, MG/L milligram per liter

mL, ML milliliter

MM of HG millimeter of mercury

MRL minimum reporting level

NTU nephelometric turbidity unit

t/day, T/DAY ton per day
Water-Quality Data for Selected Stream Sites in 

Bridgeport Valley, Mono County, California, 

April 2000 to June 2003

By Gerald L. Rockwell and Paul D. Honeywell

Introduction

Bridgeport Valley (fig. 1) is located adjacent to the eastern slopes of the Sierra Nevada in Mono County, California. 

Altitude of the drainage basin ranges from 6,420 feet at the 

Bridgeport Reservoir outlet to over 12,000 feet at the Sierra 

Nevada crest. Most precipitation comes during the winter 

months in the form of snow. Streams flowing through Bridgeport Valley form the headwaters of the East Walker River. The 

main human activities in the valley are cattle ranching and 

tourism. The only town in the valley is Bridgeport (population 843), the county seat. Nearly all streams are diverted for 

irrigation at the head of the valley. From May through November nearly all the water in the mid-valley stream channels is 

irrigation return. Buckeye Creek has a second diversion at 

mid-valley that diverts up to 90 percent of the flow for irrigation. This water enters Bridgeport Reservoir through several 

small irrigation return channels. The reservoir, located near 

the valley mouth, was built in 1923 and has a capacity of 

Abstract

The U.S. Geological Survey in cooperation with the 

California Regional Water Quality Control Board, Lahonton 

Region, carried out a water-quality data-collection program 

of selected streams in and near Bridgeport Valley, California, 

during April 2000 to June 2003. These data were collected to 

provide information used by the California Regional Water 

Quality Control Board to develop total maximum daily load 

standards. Field measurements of streamflow, barometric pressure, dissolved oxygen, pH, specific conductance, and water 

temperature were made at 15 sites located on 6 streams. Water 

samples were analyzed for nutrients, major ions, turbidity, 

fecal coliform, fecal streptococci, and suspended sediment. 

Field data, turbidity, nutrient, major ion, and sediment concentrations and fecal coliform and fecal streptococci densities are given in tables for each site. Field blank data are also 

presented in a table. 

45,490 acre-feet. Walker River Irrigation District operates the 

reservoir. The water is used for irrigation on farms and ranches 

in Nevada.

Purpose and Scope

This report presents surface-water-quality data collected 

from selected streams in Bridgeport Valley (see figure 1 and 

table 1 for sampling site locations). The types of data presented include water discharge, turbidity, field measurements, 

and concentrations of nutrients, major ions, bacteria, and sediment. The purpose of this study was to provide data to aid in 

the development of total maximum daily load standards by the 

California Regional Water Quality Control Board, Lahontan 

Region, for the various streams in Bridgeport Valley. 

Sampling sites were selected to account for the main 

surface-water sources entering Bridgeport Reservoir and to 

define variability in quality between the headwaters and the 

release from the reservoir. Monthly samples were taken during 

the first year (April 2000 to June 2001, at sites 2-5, 7-9, 11, 

and 13-15). Green Creek near Bridgeport (site 11) was added 

in June 2000. The main focus was on quantifying concentrations of nutrients and sediment. Monthly bacteria samples also 

were taken. Samples collected in May and September 2000 

and January 2001 at each site were analyzed for major ions. 

One snowmelt diurnal (June 7, 2000) was sampled at three 

sites (sites 4, 9, and 14). 

Sampling in the second year (July 2001 to June 2002) of 

the program was reduced owing to budget constraints. Bacteria 

and major ions analyses were discontinued. Robinson Creek 

at Highway 395 (site 8) and Buckeye Creek at Highway 395 

(site 3) were discontinued. Samples were collected quarterly 

at the remaining sites. One storm sample (Nov. 22, 2001) was 

collected at five sites (sites 2, 4, 7, 9, and 14).

In the third year (June 2002 to June 2003), the program 

was limited to quarterly nutrient and sediment samples and 

one fecal coliform sample at four sites in canyon reaches tributary to the Bridgeport Valley floor (sites 1, 6, 10, and 12).
2 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Figure 1. Location of the study area and sites in and near Bridgeport Valley, California, where water samples were collected, April 2000 

to June 2003: (A) Study area, (B) Water-sample collection sites.

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Figure 1. Location of the study area and sites in and near Bridgeport Valley, California, where water samples were collected, April 2000 

to June 2003: (A) Study area, (B) Water-sample collection sites.—Continued

Site numbers correspond with those in table 1. Click on site number to see data for that site.

Purpose and Scope 3

9

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4 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Methods of Study

On-site measurements included streamflow, barometric 

pressure, dissolved oxygen, pH, water temperature, and 

specific conductance. Water samples were analyzed at the U.S. 

Geological Survey (USGS) National Water Quality Laboratory 

(NWQL) in Denver, Colorado, for nutrients and major ions. 

Suspended-sediment samples were analyzed at the USGS 

California District Sediment Laboratory in Marina, California. 

Fecal coliform and fecal streptococci were analyzed by USGS 

field personnel at a temporary laboratory set up in a U.S. 

Forest Service facility in Bridgeport.

Sampling Procedures

The on-site measurements of barometric pressure, dissolved oxygen, pH, specific conductance, water temperature, 

and chemical and bacterial samples were collected and processed using methods described in the USGS National Field 

Manual (U.S. Geological Survey, 1997 to present). Streamflow measurements were done using procedures described 

by Rantz (1982). Concentrations of nutrients and major ions 

were analyzed by the National Water Quality Laboratory 

according to methods described by Fishman (1993). Dissolved 

(filtered) samples were processed through 0.45 micron filters. 

Suspended sediment samples were obtained using methods 

described by Edwards and Glysson (1988). Sediment analysis 

was done at the USGS California District Sediment Laboratory using methods described by Guy (1969).

During the first year of sampling it was discovered that 

during the irrigation season, up to 90 percent of the flow in 

Buckeye Creek was being diverted upstream of site 4 at the 

mid-valley diversion (fig. 1). Therefore, sampling at site 4 did 

not reflect the true sediment and chemical quality contributed 

by Buckeye Creek to Bridgeport Reservoir. Subsequently, 

when sampling dates coincided with periods of diversion of 

water from Buckeye Creek (September 2001 and June 2002), 

a composite sample was collected using all of the irrigation 

return channels. These composite samples were proportioned 

based on the total streamflow at the mid-valley diversion. Each 

irrigation return channel was measured and then the proportional volume of water from the channel was added to the 

churn splitter. The composite better reflects the total sediment 

and chemical quality contributed by Buckeye Creek to Bridgeport Reservoir than would a single sample at site 4.

Quality Assurance Procedures

During each field run, a sequential replicate water sample 

or a field blank was taken. Replicate samples allow evaluation 

of variability introduced by sampling procedures. Field blanks 

consist of inorganic-free water that is subjected to the same 

aspects of sample collection, field processing, preservation, 

transportation, and laboratory handling as an environmental 

sample. The National Water Quality Laboratory followed 

analytical quality assurance practices described by Pritt and 

Raese (1995) and Pirkey and Glodt (1998). Nearly all sediment samples were collected and analyzed in duplicate at each 

site. The USGS California District Sediment Laboratory followed quality assurance practices described in the laboratory’s 

unpublished quality assurance plan. The results of the fieldblank and replicate sampling are discussed in the next section.

Review of Data 

Field data, turbidity, nutrient, major ion, and sediment 

concentrations and fecal coliform and fecal streptococci densities are listed in tables 2-16. Field blank data are listed in table 

17.

Most of the field blank samples indicate that no contamination was introduced by sampling or analytical procedures. 

Three of the field blank samples, May 12, June 8, and September 14, 2002, indicated some contamination of the environmental samples may have occurred. A careful analysis of the 

data revealed the following:

• May 12, 2000: field blank data indicate possible aluminum and zinc contamination. These constituents were 

not analyzed for in the environmental samples, so the 

results were not affected.

• June 8, 2000: field blank data indicate possible dissolved ammonia and dissolved nitrite-plus-nitrate 

contamination. Dissolved ammonia data at sites 4 and 

9 were flagged with a “V” to indicate possible contamination. All other environmental data associated with 

this blank appeared reasonable.

• September 14, 2000: field blank data indicate possible dissolved ammonia, nitrite plus nitrate, dissolved 

ammonia plus organic nitrogen, orthophosphate, total 

phosphorus, and calcium contamination. The calcium 

concentration (0.013 mg/L) in the blank sample was 

near the detection limit (0.010 mg/L) and much lower 

than in any of the environmental samples (4.84 to 19.8 

mg/L). All of the environmental calcium data appeared 

reasonable. The analysis revealed possible contamination at six sites (sites 2, 3, 5, 7, 8, and 11). The dissolved ammonia value at site 7 was judged unreliable 

and removed from the table. Some data at these sites 

were flagged with a “V” to indicate possible contamination. All other environmental data associated with 

this blank appeared reasonable.

The sequential replicate samples collected at sites 4, 13, 

and 14 indicate that a reproducible sample can be collected 

using procedures described in this report.

In a few instances, the concentration of a specific element was greater in the dissolved (filtered through 0.45 

micron filter) sample than the unfiltered (total) sample. In 
References Cited 5

these instances, differences may be due to normal variance in 

analytical results. The data were analyzed using the following 

criteria: If dissolved is greater than total the results are acceptable if it is within two times the long-term detection limit of 

the least precise of the two analytical methods. An analysis of 

the data indicates these differences are within the acceptable 

ranges except site 2, March 14, 2001 (table 3), orthophosphate 

and total phosphorus; site 5, March 13, 2001 (table 6), total 

and dissolved ammonia plus organic nitrogen; and site 15, 

October 11, 2000 (table 16), total and dissolved ammonia plus 

organic nitrogen. These values were removed from the tables.

The less-than (<) values reported for analytes in water 

samples are reported when an analyte either is not detected or 

is detected at a concentration less than the laboratory reporting level (LRL). The LRL is defined as generally equal to 

twice the annually determined long-term method detection 

level (Childress and others, 1999). The estimated (E) value 

is reported for data where the analyte is detected above the 

method detection limit, but below the minimum reporting level 

(MRL) (Childress and others, 1999). The MRL is defined as 

the smallest measured concentration of a substance that can be 

reliably measured using a given analytical method. For these 

samples, the compound has passed all criteria used to identify 

its presence, and only the concentration is estimated. 

National Water Quality Laboratory procedures for turbidity changed during the project. The old procedure for static 

turbidity measurements using the Hach 2100A turbidimeter 

instrument was replaced with a dynamic flow-through procedure using the Hach 2100AN turbidimeter. Values less than 20 

Nephelometric Turbidity Units (NTU) minimally are affected 

by the change in analytical procedures. Data may change for 

more turbid and colored samples, usually with increased values on the Hach 2100AN (Brown, 2000). Both methods have 

been published in this report where they are available.

Summary

The U.S. Geological Survey collected water-quality data 

from selected streams in and near Bridgeport Valley between 

April 2000 and June 2003. Water samples were collected and 

analyzed according to U.S. Geological Survey procedures. 

On-site measurements of streamflow, barometric pressure, 

dissolved oxygen, pH, water temperature, and specific conductance were made at 15 sites on 6 different streams. Water 

samples were collected for chemical analyses of nutrients and 

major ion concentrations. Water samples were also analyzed 

for turbidity, fecal coliform and fecal streptococci densities, 

and suspended sediment concentration. Field blanks and 

replicate samples were collected to assure the quality of the 

environmental-sample data. Data are presented in tables 2-17.

References Cited

Childress, C.J.O., Foreman, W.T., Connor, B.F., and Maloney, 

T.J., 1999, New reporting procedures based on long-term 

method detection levels and some considerations for 

interpretations of water-quality data provided by the U.S. 

Geological Survey National Water Quality Laboratory: U.S. 

Geological Survey Open-File Report 99-193, 19 p.

Brown, G.E., 2000, Hach Turbidimeter 2100AN to replace 

Hach Turbidimeter 2100A for determination of turbidity 

in raw unfiltered water: U.S. Geological Survey National 

Water Quality Laboratory Technical Memorandum 00.04, 

1 p.

Edwards, T.K., and Glysson, G.D., 1988, Field methods for 

measurement of fluvial sediment: U.S. Geological Survey 

Open-File Report 86-531, 118 p.

Fishman, M.J., ed., 1993, Methods of analysis by U.S. 

Geological Survey National Water Quality Laboratory—

Determination of inorganic and organic constituents in 

water and fluvial sediments: U.S. Geological Survey OpenFile Report 93-125, 217 p.

Guy, H.P., 1969, Laboratory theory and methods for sediment 

analysis: U.S. Geological Survey Techniques of WaterResources Investigations, book 5, chap. C1, 58 p.

Pirkey, K.D., and Glodt, S.R., 1998, Quality control at the U.S. 

Geological Survey National Water Quality Laboratory: U.S. 

Geological Survey Fact Sheet 26-98, 4 p.

Pritt, J.W., and Raese, J.W., 1995, Quality assurance/quality 

control manual—National Water Quality Laboratory: U.S. 

Geological Survey Open-File Report 95-443, 35 p. 

Rantz, S.E., 1982, Measurement and computation of streamflow: Volume 1. Measurement of stage and discharge: U.S. 

Geological Survey Water-Supply Paper 2175, 284 p.

U.S. Geological Survey, 1997 to present, National field 

manual for the collection of water-quality data: U.S. 

Geological Survey Techniques of Water-Resources 

Investigations, book 9, chap. A1-A9, 2 v., variously 

paginated.
6 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003
Tables 7

Tables
8 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Site no.

(fig. 1)

Table 

no.

USGS station no. Station name Drainage area

(mi2)

Elevation

(feet) Latitude Longitude

1 2 381406119213501 Buckeye Creek above Campground, 

near Bridgeport

Not determined 7,210 38°14’06” 119°21’35”

2 3 10291500 Buckeye Creek near Bridgeport 44.1 6,945 38°14’18” 119°19’37”

3 4 10291800 Buckeye Creek at Highway 395, 

near Bridgeport

54.8 6,499 38°15’48” 119°16’39”

4 5 10292100 Buckeye Creek at Bridgeport 

Reservoir, near Bridgeport

110 6,459 38°16’37” 119°15’25”

5 6 10292000 Swauger Creek near Bridgeport 52.8 6,620 38°17’00” 119°17’55”

6 7 380834119261201 Robinson Creek below Barney Lake, 

near Bridgeport

Not determined 8,270 38°08’34” 119°26’12”

7 8 10290500 Robinson Creek at Twin Lakes 

Outlet, near Bridgeport

39.1 7,107 38°10’19” 119°19’26”

8 9 10291100 Robinson Creek at Highway 395, 

near Bridgeport

47.0 6,505 38°15’34” 119°16’23”

9 10 10291200 Robinson Creek at Bridgeport 

Reservoir, near Bridgeport

47.5 6,456 38°16’23” 119°15’15”

10 11 380621119165601 Green Creek above Campground, 

near Bridgeport

Not determined 8,065 38°06’21” 119°16’56”

11 12 10289500 Green Creek near Bridgeport 19.5 6,866 38°10’27” 119°14’01”

12 13 380505119113301 Virginia Creek at Conway Summit, 

near Lee Vining

Not determined 8,367 38°05’05” 119°11’33”

13 14 10289000 Virginia Creek near Bridgeport 63.6 6,742 38°11’27” 119°12’35”

14 15 10290200 East Walker River at Bridgeport 159 6,433 38°15’29” 119°13’33”

15 16 10293000 East Walker River near Bridgeport 359 6,391 38°19’42” 119°12’48”

Table 1. Location of sites in and near Bridgeport Valley, California, where water-quality samples were collected, April 2000 to June 

2003.

[USGS, U.S. Geological Survey. mi2, square mile. Site numbers correspond to those shown in figure 1. Click on the site number to see data for that site]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity lab 

Hach 2100AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen,

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Jun 5, 2002 1335 135 2.1 592 9.2 106 7.5 24 10.5

Sep 24 1300 8.4 1.3 588 — — 8.2 89 11.0

Mar 11, 2003 1215 15 1.3 583 — — 8.0 81 4.0

Jun 5 1350 190 3.3 589 9.2 104 5.3 25 9.5

Date

Nitrogen, 

ammonia 

dissolved

(mg/L as N)

(00608)

Nitrogen, 

ammonia +

organic

dissolved

(mg/L as N)

(00623)

Nitrogen 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3 

dissolved

(mg/L as N)

(00631)

Orthophosphate, 

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Coliform,

fecal, 0.7

UM-MF

(cols/100 mL)

(31625)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Jun 5, 2002 <0.015 <0.10 E0.07 0.016 <0.007 0.016 <1 25 9.1

Sep 24 <.015 <.10 E.08 <.013 <.007 .006 — 1 .02

Mar 11, 2003 <.015 <.10 <.10 <.022 E.004 .010 — 4.0 .16

Jun 5 <.015 <.10 E.10 E.018 <.007 .023 — 31 16

Table 2. Site 1: Discharge, field measurements, and water-quality data for Buckeye Creek above Campground, near Bridgeport, 

California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

t/day, ton per day. —, no data. <, less than. E, Estimated]
Tables 9

Table 3. Site 2: Discharge, field measurements, and water-quality data for Buckeye Creek near Bridgeport, California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature 

water

(deg C)

(00010)

Apr 12, 2000 1310 65 — — — — — — — —

May 10 1100 137 0.60 — 595 9.7 96 7.8 40 4.5

Jun 8 1135 213 .80 — 587 10.0 101 7.7 29 4.5

Jul 13 0950 89 .60 — 595 9.4 103 8.0 42 8.5

Aug 10 1015 41 .40 — 594 8.3 94 7.8 63 9.5

Sep 14 1025 20 <.50 — 593 8.3 94 7.9 87 9.5

Oct 12 1645 19 .25 — 590 9.3 97 7.6 85 6.0

Nov 14 1505 22 .20 .9 587 10.5 93 7.8 88 0

Dec 13 1145 16 2.6 1.1 588 8.5 75 8.1 100 0

Jan 11, 2001 1110 12 .52 .4 582 10.6 95 7.9 102 0

Feb 16 1255 14 .45 8.3 605 8.5 74 8.0 95 .5

Mar 14 1045 13 .35 .6 — — — 8.2 97 1.5

Apr 10 1020 23 1.1 .7 585 9.6 86 7.9 79 0

May 11 0930 164 2.9 4.4 593 9.7 95 7.4 28 4.0

Jun 7 1015 105 — .9 596 8.9 94 7.3 36 7.0

Sep 13 0920 12 — 1.6 593 8.8 94 8.2 90 7.5

Nov 22 1530 21 — 1.9 — — — — 89 4.0

Dec 19 1010 18 — .4 588 10.0 89 8.2 91 0

Mar 20, 2002 1730 19 — 5.7 594 10.4 105 8.0 81 5.0

Jun 3 1115 172 — 2.2 596 9.9 103 7.6 28 6.5

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 12, 2000 — — — — — — — — — —

May 10 16 4.84 0.907 0.71 0.2 1.63 17 E0.20 <0.1 7.66

Jun 8 — — — — — — — — — —

Jul 13 — — — — — — — — — —

Aug 10 — — — — — — — — — —

Sep 14 35 10.3 2.31 1.59 .2 3.29 16 .43 <.1 12.9

Oct 12 — — — — — — — — — —

Nov 14 — — — — — — — — — —

Dec 13 — — — — — — — — — —

Jan 11, 2001 42 12.1 2.82 1.72 .3 3.83 16 .45 <.2 13.3

Feb 16 — — — — — — — — — —

Mar 14 — — — — — — — — — —

Apr 10 — — — — — — — — — —

May 11 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Sep 13 — — — — — — — — — —

Nov 22 — — — — — — — — — —

Dec 19 — — — — — — — — — —

Mar 20, 2002 — — — — — — — — — —

Jun 3 — — — — — — — — — —
10 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Table 3. Site 2: Discharge, field measurements, and water-quality data for Buckeye Creek near Bridgeport, California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Solids, 

residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, 

ammonia 

dissolved 

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate, 

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 12, 2000 — — <0.002 E0.05 0.13 <0.005 0.002 0.014

May 10 1.6 31 <.002 E.08 .11 .005 .002 .010

Jun 8 — — <.002 E.05 E.10 .022 <.001 .018

Jul 13 — — <.002 <.10 <.10 .010 .004 .012

Aug 10 — — <.002 E.05 E.06 .021 .003 .009

Sep 14 4.6 63 .003 .10 .10 <.005 V.012 .010

Oct 12 — — .002 E.06 E.05 <.005 <.007 .006

Nov 14 — — <.002 <.10 .08 .009 <.007 .007

Dec 13 — — .018 .15 <.08 .006 <.007 .004

Jan 11, 2001 6.2 70 <.002 <.10 <.08 .033 .008 .007

Feb 16 — — .005 E.07 E.06 .055 E.004 .008

Mar 14 — — .004 E.06 E.04 .028 — —

Apr 10 — — .011 <.10 .10 .017 <.007 .009

May 11 — — .002 E.06 .19 .017 E.005 .055

Jun 7 — — .005 <.10 E.04 .014 <.007 .012

Sep 13 — — .002 E.05 .09 .009 <.007 .007

Nov 22 — — <.015 E.08 .14 <.013 E.004 .014

Dec 19 — — <.015 <.10 E.07 .023 <.007 .006

Mar 20, 2002 — — <.015 <.10 E.06 E.010 <.007 .009

Jun 3 — — <.015 <.10 E.07 .018 <.007 .026

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 12, 2000 k2 k2 — — — 7.0 1.2

May 10 k2 k1 32 310 3.2 14 5.2

Jun 8 — — — — — 28 16.1

Jul 13 >60 54 — — — 6.0 1.4

Aug 10 56 39 — — — 1.0 .11

Sep 14 k11 k13 44 90 2.3 1.0 .05

Oct 12 k2 k4 — — — 4.0 .20

Nov 14 <1 k1 — — — 2.0 .12

Dec 13 k1 k1 — — — 2.0 .08

Jan 11, 2001 <1 k1 E9 50 E2.0 2.0 .06

Feb 16 <1 k2 — — — 1.0 .04

Mar 14 <1 k2 — — — 1.0 .03

Apr 10 <1 <1 — — — 5.0 .32

May 11 k2 k3 — — — 46 20.4

Jun 7 k1 k14 — — — 8.0 2.3

Sep 13 — — — — — 2.0 .07

Nov 22 — — — — — 2.0 .11

Dec 19 — — — — — 1.0 .05

Mar 20, 2002 — — — — — 2.0 .10

Jun 3 — — — — — 28 13.0
Tables 11

Table 4. Site 3: Discharge, field measurements, and water-quality data for Buckeye Creek at Highway 395, near Bridgeport, California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Apr 13, 2000 1050 12 — — 600 8.9 93 7.7 76 6.5

May 11 0940 46 0.50 — 600 10.0 95 7.8 59 3.0

Jun 6 0945 150 2.2 — 603 9.4 98 6.9 36 7.0

Jul 12 0945 45 1.4 — 605 8.8 104 7.5 61 12.5

Aug 9 1000 9.9 1.4 — 604 6.7 82 — 98 14.0

Sep 13 1000 2.8 .70 — 605 7.6 87 7.2 132 11.0

Oct 12 1135 12 .34 — 602 9.7 99 6.8 114 6.0

Nov 14 1110 8.5 .40 1.2 596 10.1 90 7.4 115 .5

Dec 12 1045 11 .36 .7 594 10.4 91 7.9 120 0

Jan 10, 2001 0930 4.4 1.3 .9 596 9.8 86 7.2 143 0

Feb 14 0930 14 .60 1.9 610 9.5 81 7.9 113 0

Mar 13 1430 10 .50 1.2 600 8.6 94 7.9 120 8.5

Apr 12 1145 7.9 6.5 1.0 600 9.2 93 7.6 98 5.5

May 9 1150 120 6.8 12 602 7.6 85 7.3 35 9.5

Jun 5 1250 54 — 2.3 599 7.6 94 7.3 45 14.0

Date

Hardness 

total 

(mg/L as 

CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved

(mg/L as NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 13, 2000 — — — — — — — — — —

May 11 22 6.47 1.44 0.91 0.2 2.68 20 E0.25 <0.1 9.86

Jun 6 — — — — — — — — — —

Jul 12 — — — — — — — — — —

Aug 9 — — — — — — — — — —

Sep 13 47 13.4 3.31 2.11 .4 5.84 20 .53 .1 16.8

Oct 12 — — — — — — — — — —

Nov 14 — — — — — — — — — —

Dec 12 — — — — — — — — — —

Jan 10, 2001 51 14.5 3.63 1.95 .4 6.56 21 .84 E.1 17.2

Feb 14 — — — — — — — — — —

Mar 13 — — — — — — — — — —

Apr 12 — — — — — — — — — —

May 9 — — — — — — — — — —

Jun 5 — — — — — — — — — —
12 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Date

Sulfate, 

dissolved

(mg/L as 

S04)

(00945)

Solids, 

residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, 

ammonia 

dissolved 

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate, 

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 13, 2000 — — 0.004 0.26 0.52 <0.005 0.10 0.116

May 11 2.4 50 .010 .13 .17 <.005 .002 .011

Jun 6 — — .002 E.08 .17 .013 <.001 .032

Jul 12 — — <.002 .14 .19 <.005 .006 .029

Aug 9 — — <.002 .29 .32 <.005 .011 .036

Sep 13 5.3 85 .009 .12 .14 V.046 .006 .018

Oct 12 — — .005 E.09 .14 <.005 <.007 .013

Nov 14 — — .003 <.10 .17 .005 <.007 .008

Dec 12 — — <.002 E.06 E.05 .005 <.007 .004

Jan 10, 2001 8.3 93 .003 <.10 E.05 .008 <.007 .008

Feb 14 — — .006 <.10 E.08 .035 <.007 .009

Mar 13 — — .012 E.08 E.04 .005 <.007 .010

Apr 12 — — .004 E.05 .09 .005 <.007 .010

May 9 — — <.002 .16 .41 .005 E.005 .115

Jun 5 — — .004 <.10 .12 <.005 <.007 .018

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 13, 2000 k15 86 — — — — —

May 11 73 38 61 350 19.2 9.0 1.1

Jun 6 k180 119 — — — 28 11.3

Jul 12 >600 380 — — — 10 1.2

Aug 9 k288 560 — — — 4.0 .11

Sep 13 533 k40 115 420 50.0 2.0 .02

Oct 12 105 k58 — — — 5.0 .16

Nov 14 41 28 — — — 4.0 .09

Dec 12 k11 k2 — — — 10 .30

Jan 10, 2001 k6 k4 80 230 56.3 5.0 .06

Feb 14 k3 k2 — — — 3.0 .11

Mar 13 k2 k11 — — — 2.0 .06

Apr 12 k1 <1 — — — 2.0 .04

May 9 k15 58 — — — 77 24.9

Jun 5 50 44 — — — 9.0 1.3

Table 4. Site 3: Discharge, field measurements, and water-quality data for Buckeye Creek at Highway 395, near Bridgeport, 

California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]
Tables 13

Table 5. Site 4: Discharge, field measurements, and water-quality data for Buckeye Creek at Bridgeport Reservoir, near Bridgeport, 

California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Apr 11, 2000 1430 6.0 — — 605 8.7 109 7.5 135 15.0

May 9 1420 56 1.7 — 600 8.4 102 7.9 62 13.0

Jun 7 0800 118 1.9 — 600 9.3 98 7.0 45 7.0

Jun 7 1340 112 3.3 — 598 8.2 104 7.6 47 15.0

Jun 7 1830 91 2.1 — 598 7.7 99 7.2 49 15.5

Jul 11 1015 22 1.5 — 605 6.8 85 7.6 77 15.0

Aug 8 1110 2.0 2.3 — 604 7.0 98 7.5 213 20.0

Sep 12 1120 8.4 <.50 — 605 8.1 98 7.1 193 13.5

Oct 11 1100 20 .55 — 597 7.6 78 8.0 131 5.5

Nov 15 1025 25 1.1 4.6 601 10.5 91 7.2 135 0

Dec 11 1345 27 2.6 4.3 599 10.3 91 7.9 130 .5

Jan 12, 2001 1025 17 1.6 1.9 598 10.2 89 7.9 146 0

Jan 121 1040 — — — — — — — — —

Feb 15 1055 21 .80 2.6 614 9.1 77 7.6 122 0

Mar 13 0925 29 1.9 3.4 605 9.5 84 7.8 130 1.0

Apr 11 1100 13 2.9 1.4 595 9.1 93 7.7 140 5.5

May 10 1010 144 7.2 14 604 7.6 79 7.4 45 7.0

Jun 6 0955 52 — 2.5 604 7.7 86 7.2 57 10.0

Sep 12 1220 12 — 12 600 7.9 98 8.5 113 14.5

Nov 22 1150 26 — 9.0 — — — — 124 7.0

Dec 18 1400 21 — 1.6 603 10.3 90 7.8 116 0

Mar 20, 2002 1400 19 — 5.6 605 9.8 112 8.0 124 11.0

Jun 4 1250 114 — 8.6 607 8.3 108 7.5 55 16.5

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 11, 2000 — — — — — — — — — —

May 9 22 6.20 1.46 1.14 0.4 4.13 28 0.49 0.1 9.90

Jun 7 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Jul 11 — — — — — — — — — —

Aug 8 — — — — — — — — — —

Sep 12 53 14.5 4.02 4.76 1 17.1 39 2.55 .3 21.3

Oct 11 — — — — — — — — — —

Nov 15 — — — — — — — — — —

Dec 11 — — — — — — — — — —

Jan 12, 2001 48 13.5 3.37 1.86 .6 9.29 29 1.42 .2 18.3

Jan 121 — — — — — — — — — —

Feb 15 — — — — — — — — — —

Mar 13 — — — — — — — — — —

Apr 11 — — — — — — — — — —

May 10 — — — — — — — — — —

Jun 6 — — — — — — — — — —

Sep 12 — — — — — — — — — —

Nov 22 — — — — — — — — — —

Dec 18 — — — — — — — — — —

Mar 20, 2002 — — — — — — — — — —

Jun 4 — — — — — — — — — —
14 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Solids, 

residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, 

ammonia 

dissolved 

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate, 

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 11, 2000 — — 0.007 0.18 0.28 <0.005 0.022 0.048

May 9 2.6 50 .010 .20 .26 <.005 .007 .029

Jun 7 — — .004 .11 .20 .031 .005 .045

Jun 7 — — .002 .12 .22 .012 .005 .045

Jun 7 — — V.017 .12 .20 .013 .006 .030

Jul 11 — — <.002 .14 .20 <.005 .009 .029

Aug 8 — — <.002 .41 .58 <.005 .044 .100

Sep 12 9.3 137 .009 .53 .58 <.005 .021 .059

Oct 11 — — .004 E.07 .24 <.005 .013 .038

Nov 15 — — .002 <.10 .17 .008 .008 .051

Dec 11 — — .002 E.07 .09 .008 .007 .040

Jan 12, 2001 9.3 94 .002 E.07 .09 .027 .013 .024

Jan 121 — — <.002 E.07 .14 .022 E.006 .040

Feb 15 — — .004 E.09 .08 .043 .007 .023

Mar 13 — — <.002 .10 .16 .007 .012 .040

Apr 11 — — .006 E.09 .16 <.005 .009 .024

May 10 — — .005 .17 .36 .008 .012 .089

Jun 6 — — .006 .16 .21 .007 .021 .057

Sep 12 — — .009 .16 .32 .008 .020 .092

Nov 22 — — <.015 .10 .26 <.013 .020 .073

Dec 18 — — <.015 <.10 .11 .025 .014 .039

Mar 20, 2002 — — <.015 <.10 .10 <.013 .016 .031

Jun 4 — — .018 .46 .63 <.013 E.005 .120

Date

Coliform, fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 11, 2000 k2 k4 — — — 5.0 0.08

May 9 k13 23 57 560 13.6 19 2.9

Jun 7 >200 305 — — — 37 11.8

Jun 7 >300 160 — — — 32 9.7

Jun 7 192 120 — — — 16 3.9

Jul 11 >600 262 — — — 2.0 .12

Aug 8 k55 k71 — — — 4.0 .02

Sep 12 >600 520 81 300 30.5 12 .27

Oct 11 114 52 — — — 12 .64

Nov 15 37 38 — — — 46 3.1

Dec 11 k7 k20 — — — 15 1.1

Jan 12, 2001 k2 k7 27 360 30.4 14 .66

Jan 121 — — — — — — —

Feb 15 k2 k17 — — — 6.0 .35

Mar 13 k1 k6 — — — 16 1.3

Apr 11 k1 k2 — — — 3.0 .11

May 10 >120 >200 — — — 127 49.4

Jun 6 k1,630 154 — — — 18 2.5

Sep 12 — — — — — 3.0 .10

Nov 22 — — — — — 19 1.3

Dec 18 — — — — — 12 .68

Mar 20, 2002 — — — — — 5.0 .25

Jun 4 — — — — — 14 4.3

Table 5. Site 4: Discharge, field measurements, and water-quality data for Buckeye Creek at Bridgeport Reservoir, near Bridgeport, 

California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]

1 Replicate sample.
Tables 15

Table 6. Site 5: Discharge, field measurements, and water-quality data for Swauger Creek near Bridgeport, California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Apr 13, 2000 1020 20 — — 600 9.1 92 8.3 118 5.5

May 11 0850 13 2.2 — 600 10.9 98 8.3 120 1.0

Jun 6 0845 5.2 1.9 — 598 9.6 102 8.0 153 7.5

Jul 12 0900 3.0 .70 — 605 9.1 103 8.0 201 10.5

Aug 9 0910 2.3 2.1 — 600 7.1 80 — 201 10.0

Sep 13 0910 5.1 — — 600 8.5 94 7.3 149 9.0

Oct 12 1030 5.6 .72 — 597 9.9 97 7.6 136 4.0

Nov 14 1015 4.4 .68 1.2 593 10.2 96 7.7 160 2.5

Dec 12 0950 6.1 .50 1.4 591 10.7 99 8.5 136 1.5

Jan 9, 2001 1545 6.0 2.4 2.5 591 9.6 93 8.5 132 3.5

Feb 14 1140 6.6 1.4 3.2 605 10.9 102 8.6 128 3.0

Mar 13 1325 7.3 2.1 4.0 598 9.1 96 8.4 135 7.0

Apr 12 1045 11 5.7 5.2 596 9.4 88 7.8 130 2.5

May 9 1350 5.5 5.5 10 598 6.7 91 8.2 156 18.5

Jun 5 1150 3.8 — 3.9 595 7.7 98 8.3 176 15.0

Sep 12 1630 3.1 — 2.1 595 6.2 82 8.1 160 16.5

Dec 18 1040 4.7 — 1.8 598 9.4 87 8.2 158 2.0

Mar 19, 2002 1650 7.3 — 6.5 600 9.2 103 8.1 131 9.5

Jun 6 1450 3.4 — 4.5 600 9.0 130 8.9 182 21.5

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K)

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 13, 2000 — — — — — — — — — —

May 11 42 10.8 3.66 2.13 0.6 8.72 30 1.60 0.1 28.3

Jun 6 — — — — — — — — — —

Jul 12 — — — — — — — — — —

Aug 9 — — — — — — — — — —

Sep 13 45 11.5 3.92 2.70 .8 11.8 35 1.34 .2 30.4

Oct 12 — — — — — — — — — —

Nov 14 — — — — — — — — — —

Dec 12 — — — — — — — — — —

Jan 9, 2001 41 10.6 3.57 2.44 .7 10.8 35 1.44 .2 28.4

Feb 14 — — — — — — — — — —

Mar 13 — — — — — — — — — —

Apr 12 — — — — — — — — — —

May 9 — — — — — — — — — —

Jun 5 — — — — — — — — — —

Sep 12 — — — — — — — — — —

Dec 18 — — — — — — — — — —

Mar 19, 2002 — — — — — — — — — —

Jun 6 — — — — — — — — — —
16 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Solids 

residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, 

ammonia 

dissolved 

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate, 

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 13, 2000 — — 0.003 0.28 0.44 0.037 0.045 0.107

May 11 3.5 99 .004 .11 .19 .052 .038 .044

Jun 6 — — <.002 E.08 .17 .083 .035 .059

Jul 12 — — .009 .29 .29 .180 .056 .090

Aug 9 — — .012 .14 .25 .282 .060 .100

Sep 13 5.9 116 V.015 E.09 .25 V.148 .045 .091

Oct 12 — — .006 .23 .23 <.005 E.006 .023

Nov 14 — — <.002 <.10 .11 .141 .038 .051

Dec 12 — — <.002 E.09 <.08 .102 .037 .054

Jan 9, 2001 6.3 102 .003 E.09 .14 .084 .030 .047

Feb 14 — — .002 E.07 .12 .076 .032 .049

Mar 13 — — .005 — — .049 .030 .063

Apr 12 — — .006 .11 .27 .082 .035 .082

May 9 — — .013 .29 .51 .102 .067 .117

Jun 5 — — .007 .10 .17 .086 .057 .085

Sep 12 — — .009 .11 .15 .101 .057 .078

Dec 18 — — <.015 <.10 .13 .129 .034 .054

Mar 19, 2002 — — <.015 E.07 .19 .067 .032 .065

Jun 6 — — E.012 .31 .39 E.012 .056 .099

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 13, 2000 k6 55 — — — 32 1.7

May 11 k2 k8 64 370 16.8 8.0 .29

Jun 6 59 89 — — — 3.0 .04

Jul 12 50 >1,000 — — — 2.0 .02

Aug 9 73 k182 — — — 5.0 .03

Sep 13 250 310 65 620 14.9 18 .25

Oct 12 k28 160 — — — 53 .80

Nov 14 k8 96 — — — 4.0 .05

Dec 12 k8 55 — — — 6.0 .10

Jan 9, 2001 k2 88 22 260 5.9 8.0 .13

Feb 14 k1 39 — — — 5.0 .09

Mar 13 k1 30 — — — 13 .26

Apr 12 k1 k16 — — — 20 .57

May 9 k3 73 — — — 16 .24

Jun 5 k128 k330 — — — 6.0 .06

Sep 12 — — — — — 6.0 .05

Dec 18 — — — — — 3.0 .04

Mar 19, 2002 — — — — — 12 .24

Jun 6 — — — — — 8.0 .07

Table 6. Site 5: Discharge, field measurements, and water-quality data for Swauger Creek near Bridgeport, California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]
Tables 17

Date Time

Discharge, 

inst. cubic 

feet per 

second

(00061)

Turbidity lab 

Hach 2100AN

NTU

(99872)

Barometric 

pressure

mm of HG

(00025)

Oxygen, dissolved

mg/L

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

μs/cm

(00095)

Temperature, 

water

deg C

(00010)

Jun 5, 2002 1025 61 2.8 568 9.1 104 6.9 8 8.0

Sep 24 1530 .94 .9 — — — 7.4 18 13.5

Mar 11, 2003 0910 4.6 1.2 580 — — 7.7 40 2.0

Jun 4 1130 82 <1.0 564 — — 5.5 8 5.5

Date

Nitrogen, 

ammonia 

dissolved

mg/L as N

(00608)

Nitrogen, 

ammonia + 

organic dissolved

mg/L as N

(00623)

Nitrogen 

ammonia + 

organic total

mg/L as N

(00625)

Nitrogen, 

NO2+NO3 

dissolved

mg/L as N

(00631)

Orthophosphate, 

dissolved

mg/L as P

(00671)

Phosphorus

total

mg/L as P

(00665)

Coliform,

fecal, 0.7

UM-MF

cols/100 mL

(31625)

Sediment,

suspended

mg/L

(80154)

Sediment,

discharge,

suspended

t/day

(80155)

Jun 5, 2002 <0.015 <0.10 E0.06 <0.013 <0.007 0.004 k1 <0.5 <0.01

Sep 24 <.015 .11 .16 <.013 <.007 .010 — 1.0 <.01

Mar 11, 2003 <.015 <.10 <.10 <.022 <.007 .008 — 1.0 .01

Jun 4 <.015 E.06 E.07 <.022 <.007 E.002 — 2.0 .44

Table 7. Site 6: Discharge, field measurements, and water-quality data for Robinson Creek below Barney Lake, near Bridgeport, 

California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; t/day, ton per day. —, 

no data. <, less than. E, Estimated. k, Counts outside acceptable range]
18 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Table 8. Site 7: Discharge, field measurements, and water-quality data for Robinson Creek at Twin Lakes Outlet, near Bridgeport, 

California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature 

water

(deg C)

(00010)

Apr 12, 2000 1145 38 — — 605 9.6 99 8.2 60 7.0

May 10 0940 144 0.40 — 595 8.9 96 8.0 58 8.0

Jun 8 1030 214 .40 — 583 8.2 101 7.8 56 12.5

Jul 13 0855 115 .40 — 592 7.6 101 7.8 47 16.5

Aug 10 0920 76 .40 — 590 7.1 97 7.4 45 18.0

Sep 14 0920 26 <.50 — 590 7.4 95 7.7 49 15.0

Oct 12 1400 21 .24 — 589 8.3 103 7.4 49 13.5

Nov 14 1355 12 .30 0.4 584 8.7 95 7.6 51 7.5

Dec 13 1045 10 .31 1.2 584 8.7 87 8.3 54 4.5

Jan 11, 2001 1010 5.8 .48 .9 579 9.7 89 7.5 52 .5

Feb 16 1520 13 .32 1.6 600 9.5 87 8.0 54 2.0

Mar 14 0915 14 .30 1.0 590 10.3 96 7.9 53 2.0

Apr 10 1150 31 2.3 .5 583 8.8 89 7.8 59 4.5

May 11 1040 131 .46 3.7 590 8.2 97 7.7 60 11.5

Jun 7 0920 120 — 1.1 592 7.3 91 7.5 53 14.0

Sep 11 1335 18 — .7 589 7.2 98 — 44 17.5

Nov 22 1447 8.9 — 2.0 — — — — 59 8.5

Dec 19 1130 2.6 — .3 585 8.8 86 7.8 56 3.5

Mar 21, 2002 1405 13 — 1.0 590 9.6 99 7.9 59 5.5

Jun 3 0920 184 — 1.4 588 8.0 98 7.9 59 12.5

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as 

CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 12, 2000 — — — — — — — — — —

May 10 23 7.88 0.836 0.72 0.2 1.97 15 E0.24 0.1 5.58

Jun 8 — — — — — — — — — —

Jul 13 — — — — — — — — — —

Aug 10 — — — — — — — — — —

Sep 14 19 6.70 .663 .54 .2 1.72 16 E.17 <.1 4.99

Oct 12 — — — — — — — — — —

Nov 14 — — — — — — — — — —

Dec 13 — — — — — — — — — —

Jan 11, 2001 22 7.68 .796 .62 .2 1.91 15 .41 E.1 5.97

Feb 16 — — — — — — — — — —

Mar 14 — — — — — — — — — —

Apr 10 — — — — — — — — — —

May 11 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Sep 11 — — — — — — — — — —

Nov 22 — — — — — — — — — —

Dec 19 — — — — — — — — — —

Mar 21, 2002 — — — — — — — — — —

Jun 3 — — — — — — — — — —
Tables 19

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Solids 

residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, 

ammonia

dissolved

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate, 

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 12, 2000 — — <0.002 <0.10 E0.08 <0.005 <0.001 E0.004

May 10 4.8 38 <.002 E.05 E.10 <.005 <.001 <.008

Jun 8 — — .002 <.10 E.07 .007 <.001 <.008

Jul 13 — — <.002 <.10 .14 <.005 .001 E.005

Aug 10 — — <.002 E.08 E.06 <.005 <.001 E.005

Sep 14 3.5 32 — VE.08 E.08 V.037 — —

Oct 12 — — .003 E.07 E.07 <.005 <.007 E.003

Nov 14 — — .002 E.06 .17 .006 <.007 .004

Dec 13 — — .004 .10 E.06 .053 <.007 .005

Jan 11, 2001 4.7 39 .002 E.05 .14 .005 E.004 .009

Feb 16 — — .006 E.09 E.07 <.005 <.007 .007

Mar 14 — — .006 E.06 <.08 <.005 <.007 .004

Apr 10 — — .006 <.10 E.08 <.005 <.007 .005

May 11 — — <.002 E.06 E.06 <.005 <.007 .004

Jun 7 — — .004 .11 E.08 <.005 <.007 .006

Sep 11 — — .002 E.07 .09 .008 <.007 .005

Nov 22 — — <.015 E.06 .12 <.013 <.007 .005

Dec 19 — — <.015 E.05 E.06 E.009 <.007 .006

Mar 21, 2002 — — <.015 <.10 .10 <.013 <.007 .005

Jun 3 — — <.015 E.06 E.07 <.013 <.007 .006

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 12, 2000 <1 <1 — — — 1.0 0.10

May 10 <1 <1 <10 30 <2.2 1.0 .39

Jun 8 — — — — — 3.0 1.7

Jul 13 k2 k10 — — — 2.0 .62

Aug 10 k14 k6 — — — 1.0 .21

Sep 14 k4 k10 E6 <20 <2.2 <.5 <.01

Oct 12 <1 k6 — — — 7.0 .40

Nov 14 k1 k4 — — — 1.0 .03

Dec 13 <1 <1 — — — 3.0 .08

Jan 11, 2001 <1 k2 <10 30 E1.7 3.0 .05

Feb 16 <1 <1 — — — 1.0 .04

Mar 14 <1 <1 — — — <.5 <.01

Apr 10 <1 <1 — — — 1.0 .08

May 11 <1 <1 — — — 2.0 .71

Jun 7 <1 <1 — — — 1.0 .32

Sep 11 — — — — — <.5 <.01

Nov 22 — — — — — 1.0 .02

Dec 19 — — — — — 2.0 .01

Mar 21, 2002 — — — — — 1.0 .04

Jun 3 — — — — — 2.0 .99

Table 8. Site 7: Discharge, field measurements, and water-quality data for Robinson Creek at Twin Lakes Outlet, near Bridgeport, 

California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range]
20 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Table 9. Site 8: Discharge, field measurements, and water-quality data for Robinson Creek at Highway 395, near Bridgeport, California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Apr 13, 2000 1130 11 — — 600 8.8 95 7.6 77 8.0

May 11 1040 39 0.50 — 600 9.4 96 7.6 60 6.0

Jun 6 1140 124 .80 — 602 8.3 103 7.3 64 14.5

Jul 12 1045 12 2.1 — 605 8.1 106 7.3 82 17.0

Aug 9 1100 8.8 1.5 — 603 6.6 87 8.5 77 17.0

Sep 13 1045 4.6 <.50 — 605 8.0 97 7.2 82 13.5

Oct 12 1215 5.0 .36 — 601 8.2 91 6.8 75 9.5

Nov 14 1210 2.1 .21 0.4 596 9.6 90 7.3 80 2.5

Dec 12 1145 4.5 .35 .5 594 10.1 94 7.8 83 2.0

Jan 10, 2001 1045 2.7 1.2 .7 596 9.9 88 7.3 96 .5

Feb 14 1040 10 .55 2.4 609 10.2 87 7.9 72 0

Mar 13 1525 15 .50 1.9 600 8.6 96 7.8 69 9.5

Apr 12 1240 1.4 1.8 1.1 599 8.6 96 7.3 85 9.5

May 9 1255 16 1.7 5.0 602 6.6 86 7.3 57 16.5

Jun 5 1345 30 — 1.7 599 7.2 95 7.3 57 17.0

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 13, 2000 — — — — — — — — — —

May 11 23 7.28 1.21 0.85 0.2 2.44 18 E0.28 0.1 8.78

Jun 6 — — — — — — — — — —

Jul 12 — — — — — — — — — —

Aug 9 — — — — — — — — — —

Sep 13 31 9.77 1.63 1.27 .2 2.96 16 .43 .1 11.8

Oct 12 — — — — — — — — — —

Nov 14 — — — — — — — — — —

Dec 12 — — — — — — — — — —

Jan 10, 2001 39 12.0 2.13 1.26 .2 3.32 15 .58 E.1 14.5

Feb 14 — — — — — — — — — —

Mar 13 — — — — — — — — — —

Apr 12 — — — — — — — — — —

May 9 — — — — — — — — — —

Jun 5 — — — — — — — — — —
Tables 21

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, ammonia

dissolved

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate,

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 13, 2000 — — 0.005 0.30 0.36 0.007 0.004 0.023

May 11 3.9 47 <.002 E.08 .16 <.005 <.001 .012

Jun 6 — — .003 .12 .20 .008 <.001 .016

Jul 12 — — .002 .16 .22 .009 .003 .018

Aug 9 — — .003 .19 .21 <.005 .003 .016

Sep 13 4.0 58 .002 .10 .10 V.107 .001 E.005

Oct 12 — — .005 E.06 .08 <.005 <.007 .006

Nov 14 — — <.002 E.05 .15 .016 <.007 E.002

Dec 12 — — <.002 E.05 <.08 .011 <.007 <.004

Jan 10, 2001 5.8 66 .002 E.06 .08 .033 <.007 .004

Feb 14 — — .003 E.09 .10 .021 <.007 .010

Mar 13 — — .004 <.10 .17 <.005 <.007 .007

Apr 12 — — .012 E.09 .10 .023 <.007 .008

May 9 — — <.002 .23 .29 <.005 E.006 .034

Jun 5 — — .006 E.07 .14 <.005 <.007 .018

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 13, 2000 k7 134 — — — 8.0 0.24

May 11 k7 61 23 320 4.8 11 1.2

Jun 6 k202 136 — — — 9.0 3.0

Jul 12 450 100 — — — 4.0 .12

Aug 9 2,100 66 — — — 4.0 .10

Sep 13 3,600 88 54 240 11.6 <.5 <.01

Oct 12 k33 k14 — — — 12 .16

Nov 14 k5 k2 — — — 2.0 .01

Dec 12 k2 k1 — — — 2.0 .02

Jan 10, 2001 k2 k2 32 90 12.8 3.0 .02

Feb 14 k6 k13 — — — 6.0 .16

Mar 13 k1 k2 — — — 4.0 .16

Apr 12 <1 k6 — — — 3.0 .01

May 9 47 k139 — — — 7.0 .29

Jun 5 k633 69 — — — 8.0 .64

Table 9. Site 8: Discharge, field measurements, and water-quality data for Robinson Creek at Highway 395, near Bridgeport, 

California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range]
22 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Table 10. Site 9: Discharge, field measurements, and water-quality data for Robinson Creek at Bridgeport Reservoir, near Bridgeport, 

California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen,

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Apr 11, 2000 1540 5.0 — — 605 9.1 117 8.2 103 16.0

May 9 1520 36 0.50 — 600 7.6 100 8.0 88 17.0

Jun 7 0910 123 1.5 — 600 8.3 97 7.1 69 11.5

Jun 7 1445 123 2.0 — 599 7.4 102 7.7 68 19.0

Jun 7 1945 123 1.9 — 599 6.7 88 7.2 68 16.5

Jul 11 0915 15 2.2 — 605 6.5 80 7.5 88 14.0

Aug 8 1015 12 1.4 — 604 7.3 93 7.6 108 15.5

Sep 12 1015 3.9 <.50 — 605 7.6 88 7.1 123 11.5

Oct 11 1215 6.7 .49 — 597 7.8 84 7.6 110 7.5

Nov 15 1130 4.2 .40 1.8 599 9.2 84 7.4 130 2.0

Dec 11 1445 6.6 .36 .7 599 10.2 95 8.2 130 2.5

Jan 12, 2001 1130 2.9 .63 .7 598 8.9 80 8.0 152 1.0

Feb 15 1200 3.5 .50 3.0 614 8.0 70 7.7 126 1.0

Mar 13 1025 9.4 1.0 3.6 605 7.9 74 7.7 188 3.0

Apr 11 1200 5.3 2.0 1.2 595 8.9 96 7.7 126 8.0

May 10 1120 22 2.7 4.9 604 7.5 90 7.5 76 12.5

Jun 6 1110 24 — 1.5 604 8.1 99 7.8 65 14.0

Sep 12 1335 9.4 — 1.6 600 7.7 100 — 69 16.0

Nov 22 1055 8.5 — 1.2 — — — — 103 6.0

Dec 18 1500 2.5 — .7 602 9.7 91 7.7 116 3.0

Mar 20, 2002 1500 2.0 — 5.3 603 9.9 124 8.4 141 14.5

Jun 4 1015 64 — 1.2 606 9.2 110 7.7 88 13.0

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium,

dissolved

(mg/L as NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 11, 2000 — — — — — — — — — —

May 9 36 10.7 2.25 1.18 0.3 3.59 17 0.35 0.2 12.2

Jun 7 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Jul 11 — — — — — — — — — —

Aug 8 — — — — — — — — — —

Sep 12 47 13.8 3.02 2.14 .3 5.38 19 .71 .1 15.7

Oct 11 — — — — — — — — — —

Nov 15 — — — — — — — — — —

Dec 11 — — — — — — — — — —

Jan 12, 2001 58 16.8 3.90 1.71 .4 6.54 19 1.13 E.2 17.4

Feb 15 — — — — — — — — — —

Mar 13 — — — — — — — — — —

Apr 11 — — — — — — — — — —

May 10 — — — — — — — — — —

Jun 6 — — — — — — — — — —

Sep 12 — — — — — — — — — —

Nov 22 — — — — — — — — — —

Dec 18 — — — — — — — — — —

Mar 20, 2002 — — — — — — — — — —

Jun 4 — — — — — — — — — —
Tables 23

Table 10. Site 9: Discharge, field measurements, and water-quality data for Robinson Creek at Bridgeport Reservoir, near Bridgeport, 

California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range. >, greater than]

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Solids residue 

at 180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen,

ammonia

dissolved

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate,

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 11, 2000 — — <0.002 0.11 0.13 <0.005 0.006 0.014

May 9 3.5 68 .004 .28 .35 <.005 .002 .018

Jun 7 — — .004 .14 .20 .010 <.001 .021

Jun 7 — — .002 .14 .26 .010 <.001 .027

Jun 7 — — V.016 .16 .23 .010 <.001 .025

Jul 11 — — <.002 .18 .22 .008 .003 .026

Aug 8 — — .005 .30 .35 <.005 .003 .026

Sep 12 5.0 84 .003 .15 .16 <.005 .007 .016

Oct 11 — — .005 .11 .12 <.005 E.005 .014

Nov 15 — — .008 <.10 .12 .009 .009 .009

Dec 11 — — <.002 E.07 <.08 .010 <.007 .010

Jan 12, 2001 6.9 95 <.002 <.10 E.06 .015 E.006 .013

Feb 15 — — .003 E.08 E.07 .015 E.005 .013

Mar 13 — — .008 .68 .80 .007 .018 .070

Apr 11 — — .008 .12 .16 .006 E.005 .016

May 10 — — .002 .29 .35 <.005 <.007 .037

Jun 6 — — .008 .11 .14 <.005 <.007 .015

Sep 12 — — .007 .17 .21 .007 <.007 .011

Nov 22 — — <.015 <.10 E.10 <.013 <.007 .008

Dec 18 — — <.015 E.07 E.10 <.013 .008 .018

Mar 20, 2002 — — <.015 <.10 .11 <.013 .009 .019

Jun 4 — — <.015 .28 .34 <.013 <.007 .024

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 11, 2000 k2 k8 — — — 1.0 0.01

May 9 k16 88 58 340 7.2 17 1.7

Jun 7 k253 132 — — — 14 4.6

Jun 7 280 110 — — — 21 7.0

Jun 7 — — — — — 13 4.3

Jul 11 >600 350 — — — 5.0 .20

Aug 8 k50 k100 — — — 8.0 .26

Sep 12 k670 263 66 200 16.4 <.5 <.01

Oct 11 69 k18 — — — 5.0 .09

Nov 15 55 k6 — — — 2.0 4.2

Dec 11 k5 k4 — — — 3.0 .05

Jan 12, 2001 k2 k3 25 130 28.1 <.5 <.01

Feb 15 <1 k2 — — — 1.0 .01

Mar 13 k3 59 — — — 6.0 .15

Apr 11 k1 k6 — — — 4.0 .06

May 10 50 111 — — — 9.0 .53

Jun 6 54 62 — — — 2.0 .13

Sep 12 — — — — — 3.0 .08

Nov 22 — — — — — 2.0 .05

Dec 18 — — — — — 1.0 .01

Mar 20, 2002 — — — — — 2.0 .01

Jun 4 — — — — — 4.0 .69
24 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity lab 

Hach 2100AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen,

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Jun 6, 2002 0850 119 0.5 570 9.3 105 7.4 43 8.0

Sep 23 1530 9.0 .5 — — — 7.7 57 13.0

Mar 10, 2003 1515 5.5 <1.0 565 — — 7.1 63 3.0

Jun 5 1030 152 1.1 572 9.2 100 5.7 39 6.5

Date

Nitrogen, 

ammonia 

dissolved

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3 

dissolved

(mg/L as N)

(00631)

Orthophosphate, 

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Coliform,

fecal, 0.7

UM-MF

(cols/100 mL)

(31625)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Jun 6, 2002 <0.015 <0.10 E0.07 0.031 <0.007 0.006 <1 4.0 1.3

Sep 23 <.015 <.10 E.07 <.013 <.007 <.004 — 2.0 .05

Mar 10, 2003 <.015 <.10 E.06 .022 <.007 E.003 — 1.0 .01

Jun 5 <.015 <.10 E.06 .038 <.007 .004 — 2.0 .82

Table 11. Site 10: Discharge, field measurements, and water-quality data for Green Creek above Campground, near Bridgeport, 

California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated]
Review of Data 25

Table 12. Site 11: Discharge, field measurements, and water-quality data for Green Creek near Bridgeport, California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Jun 6, 2000 1530 125 0.40 — 593 8.3 99 7.1 41 12.0

Jul 12 1410 48 .60 — 605 8.3 106 7.5 44 16.0

Aug 9 1500 20 1.1 — 593 6.2 82 — 50 16.5

Sep 13 1520 8.3 <.50 — 595 7.6 95 7.1 58 14.0

Oct 10 1410 6.4 .30 — 584 8.4 93 7.4 65 8.0

Nov 13 1500 7.2 .26 1.0 588 11.0 97 7.6 77 0

Dec 12 1555 5.3 .27 1.0 587 10.6 94 7.9 75 0

Jan 10, 2001 1435 6.1 .50 .7 585 10.3 92 7.9 77 0

Feb 14 1550 10 .55 2.0 601 10.4 91 8.1 69 0

Mar 14 1450 7.2 .40 2.2 — — — 7.7 68 2.0

Apr 10 1830 19 2.8 .7 588 9.4 88 7.8 65 2.0

May 10 1515 89 1.7 5.3 593 7.1 80 7.8 38 9.5

Jun 6 1445 47 — .7 596 6.5 79 7.8 36 13.0

Sep 11 1030 6.4 — .6 594 8.1 98 7.6 60 12.5

Dec 19 1330 6.1 — .3 589 9.4 85 7.6 82 .5

Mar 19, 2002 1325 8.1 — 1.6 598 11.7 104 7.8 71 .5

Jun 6 1020 113 — 1.4 595 8.8 102 7.5 46 11.0

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as SI02)

(00955)

Jun 6, 2000 — — — — — — — — — —

Jul 12 — — — — — — — — — —

Aug 9 — — — — — — — — — —

Sep 13 21 7.46 0.458 0.72 0.2 1.86 16 E0.15 <0.1 5.24

Oct 10 — — — — — — — — — —

Nov 13 — — — — — — — — — —

Dec 12 — — — — — — — — — —

Jan 10, 2001 29 10.4 .759 .88 .2 2.89 17 .40 <.2 8.64

Feb 14 — — — — — — — — — —

Mar 14 — — — — — — — — — —

Apr 10 — — — — — — — — — —

May 10 — — — — — — — — — —

Jun 6 — — — — — — — — — —

Sep 11 — — — — — — — — — —

Dec 19 — — — — — — — — — —

Mar 19, 2002 — — — — — — — — — —

Jun 6 — — — — — — — — — —
26 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, 

ammonia

dissolved

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N_

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate,

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Jun 6, 2000 — — 0.004 <0.10 E0.09 0.011 <0.001 E0.004

Jul 12 — — <.002 <.10 <.10 .006 .001 E.004

Aug 9 — — .002 .15 .18 .023 .017 .034

Sep 13 12.2 40 .006 E.07 E.06 <.005 V.019 <.008

Oct 10 — — .003 <.10 .11 <.005 <.007 E.003

Nov 13 — — .002 <.10 E.06 .005 <.007 .004

Dec 12 — — <.002 E.07 E.06 .012 <.007 <.004

Jan 10, 2001 14.0 55 <.002 <.10 E.06 .015 <.007 E.002

Feb 14 — — .006 <.10 E.08 .038 <.007 E.003

Mar 14 — — .009 <.10 <.08 .015 <.007 E.003

Apr 10 — — .004 <.10 .10 .030 <.007 .004

May 10 — — <.002 E.06 .14 .006 <.007 .012

Jun 6 — — .006 <.10 .09 .007 <.007 .009

Sep 11 — — .003 E.05 E.06 .008 <.007 .004

Dec 19 — — <.015 <.10 E.06 E.009 <.007 E.002

Mar 19, 2002 — — <.015 <.10 .11 <.013 <.007 .004

Jun 6 — — <.015 <.10 E.08 <.013 <.007 .011

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Jun 6, 2000 k2 29 — — — 5.0 1.7

Jul 12 37 22 — — — 4.0 .52

Aug 9 k2 k4 — — — 1.0 .06

Sep 13 k1 k10 33 60 3.1 2.0 .04

Oct 10 k4 k8 — — — — —

Nov 13 k1 28 — — — 8.0 .15

Dec 12 <1 k2 — — — 1.0 .01

Jan 10, 2001 <1 k4 13 50 E2.0 1.0 .02

Feb 14 <1 k1 — — — 2.0 .06

Mar 14 <1 k11 — — — <.5 <.01

Apr 10 <1 64 — — — 2.0 .10

May 10 k2 k8 — — — 8.0 1.9

Jun 6 k2 k5 — — — 2.0 .25

Sep 11 — — — — — 3.0 .05

Dec 19 — — — — — 1.0 .02

Mar 19, 2002 — — — — — 2.0 .04

Jun 6 — — — — — 9.0 2.7

Table 12. Site 11: Discharge, field measurements, and water-quality data for Green Creek near Bridgeport, California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. V, Analyte detected in both the environmental sample and the associated 

blank(s). k, Counts outside acceptable range]
Tables 27

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity lab 

Hach 2100AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Nitrogen, 

ammonia 

dissolved

(mg/L as N)

(00608)

Jun 5, 2002 1630 21 1.6 565 7.8 63 16.0 <0.015

Sep 23 1720 2.3 1.1 — 7.7 56 10.0 <.015

Mar 10, 2003 1740 1.9 <1.0 558 7.6 56 1.0 <.015

Jun 4 1430 42 2.0 564 6.5 56 13.5 <.015

Date

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3 

dissolved

(mg/L as N)

(00631)

Orthophosphate,

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Coliform,

fecal, 0.7 

UM-MF 

(cols/100 mL)

(31625)

Sediment, 

suspended 

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Jun 5, 2002 E0.06 0.12 E0.010 <0.007 0.013 <1 6.0 0.34

Sep 23 <.10 E.09 E.010 <.007 .008 — 4.0 .02

Mar 10, 2003 <.10 <.10 .073 E.004 .007 — 1.0 <.01

Jun 4 E.06 .15 E.015 <.007 .017 — 12 1.4

Table 13. Site 12: Discharge, field measurements, and water-quality data for Virginia Creek at Conway Summit, near Lee Vining, 

California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mg/L, milligram per liter; mL, milliliter; 

t/day, ton per day. —, no data. <, less than. E, Estimated]
28 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Table 14. Site 13: Discharge, field measurements, and water-quality data for Virginia Creek near Bridgeport, California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. k, Counts outside acceptable range. >, greater than]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Apr 12, 2000 1515 20 — — 605 8.6 99 8.3 103 11.0

May 10 1240 23 0.90 — 595 8.6 98 8.0 87 10.0

Jun 5 1625 30 3.2 — 597 7.2 98 7.9 75 18.0

Jul 12 1500 7.7 .80 — 605 7.5 107 8.2 94 21.0

Aug 9 1550 5.3 .60 — 597 5.7 82 — 99 21.0

Sep 13 1625 7.2 .50 — 597 7.6 99 7.9 108 16.0

Oct 10 1525 5.2 1.1 — 587 8.4 97 8.0 131 10.0

Nov 13 1600 9.5 .90 1.9 591 10.9 98 7.8 106 .5

Dec 13 1440 15 2.0 3.1 592 10.4 91 8.0 103 0

Jan 10, 2001 1530 8.4 2.3 2.0 588 10.8 97 8.0 127 .5

Feb 15 1500 14 2.0 5.5 606 9.2 81 8.2 108 .5

Mar 12 1345 12 1.8 2.6 597 8.9 87 8.2 124 4.0

Apr 11 1535 17 3.5 2.1 589 8.6 94 8.1 118 8.0

May 10 1620 29 3.9 7.7 596 6.5 85 7.9 86 16.5

Jun 6 1530 12 — 1.9 599 6.6 91 8.3 83 19.0

Sep 11 1135 5.9 — 2.3 597 7.9 94 8.0 106 12.0

Dec 19 1440 12 — 2.0 592 10.1 90 7.9 102 .5

Dec 191 1500 — — 2.2 — — — — — —

Mar 19, 2002 1515 13 — 7.3 599 10.7 105 8.0 103 4.5

Jun 6 1130 25 — 6.1 601 8.5 104 8.0 88 13.5

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

mg/L as CL

(00940)

Fluoride, 

dissolved 

mg/L as F

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 12, 2000 — — — — — — — — — —

May 10 31 9.95 1.58 1.61 0.4 5.09 25 0.99 <0.1 17.0

Jun 5 — — — — — — — — — —

Jul 12 — — — — — — — — — —

Aug 9 — — — — — — — — — —

Sep 13 37 11.6 1.90 1.58 .5 6.60 27 .90 <.1 19.1

Oct 10 — — — — — — — — — —

Nov 13 — — — — — — — — — —

Dec 13 — — — — — — — — — —

Jan 10, 2001 41 12.2 2.42 1.87 .6 8.43 30 1.59 <.2 22.0

Feb 15 — — — — — — — — — —

Mar 12 — — — — — — — — — —

Apr 11 — — — — — — — — — —

May 10 — — — — — — — — — —

Jun 6 — — — — — — — — — —

Sep 11 — — — — — — — — — —

Dec 19 — — — — — — — — — —

Dec 191 — — — — — — — — — —

Mar 19, 2002 — — — — — — — — — —

Jun 6 — — — — — — — — — —
Tables 29

Table 14. Site 13: Discharge, field measurements, and water-quality data for Virginia Creek near Bridgeport, California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. k, Counts outside acceptable range. >, greater than]

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Solids residue 

at 180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen,

ammonia

dissolved

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate,

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 12, 2000 — — 0.004 0.17 0.27 0.007 0.013 0.033

May 10 8.2 70 .004 .17 .38 .010 .014 .025

Jun 5 — — <.002 E.08 .25 .015 .006 .045

Jul 12 — — <.002 .16 .21 .018 .016 .032

Aug 9 — — <.002 E.09 .10 <.005 <.001 E.004

Sep 13 6.1 83 .004 E.10 .12 <.005 .004 .032

Oct 10 — — .007 .11 .22 .020 .024 .051

Nov 13 — — .003 .12 .20 .014 .018 .036

Dec 13 — — <.002 E.10 .20 <.005 <.007 .038

Jan 10, 2001 8.9 94 .007 E.08 .13 .016 .020 .030

Feb 15 — — .003 .14 .20 .037 .011 .039

Mar 12 — — <.002 .24 .17 .007 .014 .032

Apr 11 — — .008 .21 .20 .008 .013 .032

May 10 — — .002 .19 .28 .009 .010 .044

Jun 6 — — .008 E.08 .13 .014 .017 .037

Sep 11 — — .002 E.10 .11 .023 .018 .034

Dec 19 — — <.015 E.09 .15 .023 .009 .030

Dec 191 — — <.015 E.08 .13 .021 .010 .028

Mar 19, 2002 — — <.015 E.07 .18 .015 .011 .043

Jun 6 — — <.015 .12 .27 .013 .009 .044

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 12, 2000 k2 k7 — — — 9.0 0.48

May 10 k1 25 125 580 16.0 12 .75

Jun 5 k11 110 — — — 23 1.9

Jul 12 50 >100 — — — 7.0 .14

Aug 9 k23 68 — — — 6.0 .09

Sep 13 k20 62 229 400 13.3 3.0 .06

Oct 10 k10 59 — — — 5.0 .07

Nov 13 k8 114 — — — 8.0 .21

Dec 13 k2 39 — — — 12 .47

Jan 10, 2001 k64 k6 105 350 23.0 6.0 .14

Feb 15 k2 21 — — — 15 .58

Mar 12 k2 k13 — — — 7.0 .22

Apr 11 k1 k5 — — — 9.0 .42

May 10 k4 28 — — — 14 1.1

Jun 6 k7 67 — — — 7.0 .23

Sep 11 — — — — — 4.0 .06

Dec 19 — — — — — 6.0 .20

Dec 191 — — — — — — —

Mar 19, 2002 — — — — — 20 .70

Jun 6 — — — — — 20 1.4

1

Replicate sample.
30 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Table 15. Site 14: Discharge, field measurements, and water-quality data for East Walker River at Bridgeport, California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. k, Counts outside acceptable range]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Apr 12, 2000 1725 34 — — 605 9.4 113 8.2 197 13.0

May 10 1620 71 0.50 — 595 8.5 108 8.5 166 14.5

Jun 7 0825 143 2.1 — 600 8.2 100 7.8 135 13.5

Jun 7 1522 143 1.8 — 600 7.5 103 7.7 126 19.0

Jun 7 2005 152 2.5 — 597 5.7 80 7.4 121 19.5

Jul 11 1345 43 1.6 — 605 7.2 101 8.3 148 20.5

Aug 8 1445 28 2.3 — 603 9.1 129 8.4 197 21.0

Sep 12 1440 17 .60 — 605 9.2 121 7.6 187 17.0

Oct 11 1620 30 .81 — 597 9.1 100 7.6 145 8.5

Nov 13 1120 36 .80 7.2 598 11.4 101 7.2 148 .5

Dec 11 1620 32 .50 1.0 598 10.4 93 8.4 185 1.0

Jan 11, 2001 1340 40 14 9.6 591 9.8 87 8.0 145 0

Feb 13 1455 31 2.4 5.4 608 10.5 90 8.0 167 0

Mar 12 1445 49 3.5 6.1 603 9.1 94 8.5 405 6.5

Apr 10 1510 52 3.4 5.0 597 8.6 96 8.3 361 9.5

May 9 1740 36 4.1 9.1 602 6.7 93 8.4 156 19.5

Jun 5 0925 69 — 6.5 599 7.3 85 7.6 144 11.0

Sep 10 1650 16 — 3.0 605 9.7 126 8.8 137 16.5

Sep 101 1655 16 — 3.1 — — — — — —

Nov 22 1345 29 — 5.3 — — — — 141 7.5

Dec 21 1120 32 — 2.3 598 10.7 94 8.1 174 0

Mar 20, 2002 1120 30 — 4.1 607 11.8 112 8.0 163 3.5

Jun 6 1550 74 — 5.3 604 9.7 139 8.3 163 21.5

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as 

SI02)

(00955)

Apr 12, 2000 — — — — — — — — — —

May 10 61 18.0 3.80 2.70 0.6 10.2 26 1.03 0.2 21.6

Jun 7 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Jul 11 — — — — — — — — — —

Aug 8 — — — — — — — — — —

Sep 12 66 19.8 3.99 2.85 .6 11.0 26 1.45 .2 24.3

Oct 11 — — — — — — — — — —

Nov 13 — — — — — — — — — —

Dec 11 — — — — — — — — — —

Jan 11, 2001 54 16.2 3.33 2.03 .5 8.76 25 1.49 E.1 21.2

Feb 13 — — — — — — — — — —

Mar 12 — — — — — — — — — —

Apr 10 — — — — — — — — — —

May 9 — — — — — — — — — —

Jun 5 — — — — — — — — — —

Sep 10 — — — — — — — — — —

Sep 101 — — — — — — — — — —

Nov 22 — — — — — — — — — —

Dec 21 — — — — — — — — — —

Mar 20, 2002 — — — — — — — — — —

Jun 6 — — — — — — — — — —
Tables 31

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Solids 

residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, 

ammonia 

dissolved 

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate, 

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 12, 2000 — — <0.002 0.42 0.52 <0.005 0.023 0.051

May 10 11.1 137 .012 .62 .60 <.005 .019 .042

Jun 7 — — .005 .49 .47 .008 .006 .041

Jun 7 — — .007 .49 .52 .009 .007 .041

Jun 7 — — .011 .54 .50 .010 .008 .046

Jul 11 — — .003 .41 .37 <.005 .016 .042

Aug 8 — — <.002 .45 .52 <.005 .016 .042

Sep 12 10.6 132 .011 .24 .27 <.005 .013 .030

Oct 11 — — .008 E.07 .19 .116 .033 .069

Nov 13 — — .017 E.09 .13 .005 .008 .016

Dec 11 — — <.002 .15 .11 .005 E.004 .013

Jan 11, 2001 11.8 109 <.002 E.08 .30 .011 .012 .048

Feb 13 — — .005 .12 .20 .022 .009 .032

Mar 12 — — .003 .51 .57 <.005 .036 .088

Apr 10 — — .012 .32 .49 .006 .024 .055

May 9 — — .003 .42 .48 <.005 .018 .054

Jun 5 — — .007 .35 .37 <.005 E.005 .034

Sep 10 — — .005 .12 .13 .008 .016 .025

Sep 101 — — — — .17 — — .027

Nov 22 — — <.015 .15 .23 <.013 .010 .032

Dec 21 — — <.015 .14 .16 .036 .008 .021

Mar 20, 2002 — — <.015 E.10 .15 <.013 .009 .021

Jun 6 — — E.014 .80 .83 <.013 .022 .075

Date

Coliform, fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 12, 2000 k3 34 — — — 7.0 0.65

May 10 82 196 116 400 44.5 12 2.3

Jun 7 k355 300 — — — 9.0 3.5

Jun 7 k268 250 — — — 9.0 3.5

Jun 7 270 293 — — — 12 4.9

Jul 11 167 76 — — — 5.0 .59

Aug 8 132 54 — — — 3.0 .22

Sep 12 93 k22 75 240 25.4 3.0 .14

Oct 11 210 58 — — — 7.0 .56

Nov 13 k10 k32 — — — 5.0 .48

Dec 11 k4 k2 — — — 4.0 .35

Jan 11, 2001 k3 k15 50 900 62.3 25 2.7

Feb 13 k2 k12 — — — 15 1.3

Mar 12 k2 60 — — — 18 2.4

Apr 10 k8 51 — — — 9.0 1.3

May 9 63 62 — — — 9.0 .87

Jun 5 170 287 — — — 5.0 .94

Sep 10 — — — — — 3.0 .13

Sep 101 — — — — — — —

Nov 22 — — — — — 6.0 .46

Dec 21 — — — — — 6.0 .51

Mar 20, 2002 — — — — — 4.0 .32

Jun 6 — — — — — 12 2.4

1

Replicate sample.

Table 15. Site 14: Discharge, field measurements, and water-quality data for East Walker River at Bridgeport, California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. k, Counts outside acceptable range]
32 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Table 16. Site 15: Discharge, field measurements, and water-quality data for East Walker River near Bridgeport, California.

(Back to table 1. Back to figure 1)

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. k, Counts outside acceptable range]

Date Time

Discharge, 

inst. (cubic 

feet per 

second)

(00061)

Turbidity

(NTU)

(00076)

Turbidity 

lab Hach 

2001AN

(NTU)

(99872)

Barometric 

pressure

(mm of HG)

(00025)

Oxygen, 

dissolved

(mg/L)

(00300)

Oxygen, 

dissolved 

(percent 

saturation)

(00301)

pH water 

whole field 

(standard 

units)

(00400)

Specific 

conductance

(μs/cm)

(00095)

Temperature, 

water

(deg C)

(00010)

Apr 12, 2000 1840 136 — — 605 8.3 100 8.3 216 13.0

May 10 1450 154 2.8 — 595 8.1 101 8.5 214 14.0

Jun 7 1145 208 1.6 — 600 7.7 102 8.3 193 17.0

Jul 11 1510 274 1.6 — 605 5.7 78 8.3 161 19.0

Aug 8 1600 244 1.4 — 604 6.2 87 8.8 161 20.5

Sep 12 1610 228 1.5 — 605 6.7 85 8.3 175 15.5

Oct 11 1450 70 5.5 — 597 7.1 86 7.1 171 13.0

Nov 13 1320 19 5.2 10 598 10.0 97 7.9 171 4.0

Dec 12 1420 26 3.0 3.8 596 9.4 91 9.0 186 3.5

Jan 11, 2001 1610 15 4.3 5.2 593 9.3 91 8.2 187 4.0

Feb 13 1620 22 2.0 3.6 609 8.9 86 7.9 209 4.5

Mar 12 1620 16 2.8 3.5 604 7.9 78 7.8 240 5.0

Apr 10 1410 75 4.5 1.6 597 8.1 88 8.1 228 8.0

May 9 1550 213 1.4 2.9 604 6.9 84 8.4 224 13.5

Jun 5 1550 138 — 3.0 602 7.0 93 8.1 168 17.0

Sep 11 1530 59 — 9.8 601 5.7 76 8.8 168 17.5

Dec 21 1215 22 — 4.6 599 8.1 78 8.3 216 4.0

Mar 20, 2002 0945 49 — 3.9 606 10.6 103 8.1 199 4.5

Jun 3 1400 230 — 2.9 608 7.7 100 8.5 209 17.0

Date

Hardness 

total (mg/L 

as CACO3)

(00900)

Calcium, 

dissolved 

(mg/L as CA)

(00915)

Magnesium, 

dissolved 

(mg/L as MG) 

(00925)

Potassium, 

dissolved 

(mg/L as K) 

(00935)

Sodium 

adsorption 

ratio

(00931)

Sodium, 

dissolved 

(mg/L as 

NA)

(00930)

Sodium 

percent

(00932)

Chloride, 

dissolved 

(mg/L as CL)

(00940)

Fluoride, 

dissolved 

(mg/L as F)

(00950)

Silica, 

dissolved 

(mg/L as SI02)

(00955)

Apr 12, 2000 — — — — — — — — — —

May 10 64 18.5 4.33 3.50 1 19.1 38 3.73 0.3 15.5

Jun 7 — — — — — — — — — —

Jul 11 — — — — — — — — — —

Aug 8 — — — — — — — — — —

Sep 12 56 16.4 3.70 2.96 .8 13.4 33 1.86 .3 12.5

Oct 11 — — — — — — — — — —

Nov 13 — — — — — — — — — —

Dec 12 — — — — — — — — — —

Jan 11, 2001 65 19.1 4.10 2.28 .7 13.5 30 2.23 .2 8.78

Feb 13 — — — — — — — — — —

Mar 12 — — — — — — — — — —

Apr 10 — — — — — — — — — —

May 9 — — — — — — — — — —

Jun 5 — — — — — — — — — —

Sep 11 — — — — — — — — — —

Dec 21 — — — — — — — — — —

Mar 20, 2002 — — — — — — — — — —

Jun 3 — — — — — — — — — —
Tables 33

Date

Sulfate, 

dissolved

(mg/L as S04)

(00945)

Solids, 

residue at 

180 deg. C 

dissolved

(mg/L)

(70300)

Nitrogen, 

ammonia 

dissolved 

(mg/L as N)

(00608)

Nitrogen, 

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen, 

ammonia + 

organic total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Orthophosphate,

dissolved

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Apr 12, 2000 — — 0.036 0.38 0.46 0.005 0.004 0.031

May 10 15.9 151 .029 .41 .93 .017 .014 .038

Jun 7 — — .072 .48 .51 .028 .036 .073

Jul 11 — — .607 .89 .99 .019 .082 .140

Aug 8 — — .522 1.1 1.3 .020 .127 .180

Sep 12 7.2 119 .067 .85 .99 .036 .089 .145

Oct 11 — — .006 — — .007 E.006 .153

Nov 13 — — .023 .37 .62 .006 E.005 .052

Dec 12 — — <.002 .34 .49 .015 .010 .030

Jan 11, 2001 14.5 120 .048 .30 .50 .009 .008 .035

Feb 13 — — .141 .35 .51 .014 .011 .039

Mar 12 — — .210 .41 .47 .019 .023 .062

Apr 10 — — .009 .23 .36 .007 <.007 .024

May 9 — — .012 .34 .45 <.005 .009 .028

Jun 5 — — .045 .39 .46 .013 .010 .045

Sep 11 — — .265 .88 1.2 .037 .219 .26

Dec 21 — — .083 .38 .43 .075 .013 .035

Mar 20, 2002 — — E.008 .16 .27 <.013 <.007 .033

Jun 3 — — .021 .41 .45 E.009 .015 .053

Date

Coliform, 

fecal,

0.7 UM-MF

(cols./100 mL)

(31625)

Fecal strep,

KF strp MF,

water

(col/100 mL)

(31673)

Iron,

dissolved

(μg/L as FE)

(01046)

Iron, total

recoverable

(μg/L as FE)

(01045)

Manganese,

dissolved

(μg/L as MN)

(01056)

Sediment,

suspended

(mg/L)

(80154)

Sediment,

discharge,

suspended

(t/day)

(80155)

Apr 12, 2000 <1 k2 — — — 3.0 1.1

May 10 k2 k3 47 260 9.0 6.0 2.5

Jun 7 <1 k1 — — — 3.0 1.7

Jul 11 k2 k13 — — — 4.0 3.0

Aug 8 <1 <1 — — — 2.0 1.3

Sep 12 <1 k6 31 180 6.3 19 11.7

Oct 11 <1 <1 — — — 32 6.1

Nov 13 <1 k2 — — — 21 1.1

Dec 12 <1 <1 — — — 10 .71

Jan 11, 2001 <1 k1 19 280 62.3 16 .66

Feb 13 <1 k2 — — — 5.0 .30

Mar 12 k1 <1 — — — 5.0 .21

Apr 10 <1 k1 — — — 3.0 .61

May 9 k1 k6 — — — 4.0 2.3

Jun 5 k1 k2 — — — 7.0 2.6

Sep 11 — — — — — 5.0 .80

Dec 21 — — — — — 4.0 .24

Mar 20, 2002 — — — — — 4.0 .53

Jun 3 — — — — — 6.0 3.7

Table 16. Site 15: Discharge, field measurements, and water-quality data for East Walker River near Bridgeport, California.—Continued

[NTU, nephelometric turbidity unit; mm, millimeter; mg/L, milligram per liter; μs/cm, microsiemens per centimeter; deg C, degrees Celsius; mL, milliliter; 

μg/L, microgram per liter; t/day, ton per day. —, no data. <, less than. E, Estimated. k, Counts outside acceptable range]
34 Water-Quality Data for Selected Stream Sites in Bridgeport Valley, Mono County, California, April 2000 to June 2003

Date Time

Calcium

dissolved

(mg/L as CA)

(00915)

Magnesium,

dissolved

(mg/L as 

MG)

(00925)

Sodium,

dissolved

(mg/L as 

NA)

(00930

Silica,

dissolved

(mg/L as 

SI02)

(00955)

Nitrogen,

ammonia

dissolved

(mg/L as N)

(00608)

Nitrogen,

ammonia + 

organic

dissolved

(mg/L as N)

(00623)

Nitrogen,

ammonia +

organic 

total

(mg/L as N)

(00625)

Nitrogen, 

NO2+NO3

dissolved

(mg/L as N)

(00631)

Nitrogen, 

nitrate

dissolved

(mg/L as 

N)

(00613)

April 13, 2000 1400 — — — — <0.002 — — <0.005 <0.001

May 12 1200 <0.002 <0.001 <0.03 <0.02 <.002 — — <.005 <.001

Jun 8 1300 — — — — .038 — — .008 .001

Jul 12 1700 — — — — .01 — — <.005 .001

Aug 9 1200 — — — — .002 — — <.005 <.001

Sep 14 1145 .013 <.001 <.03 <.02 .014 — — .148 .002

Nov 16 1600 — — — — .006 — — <.005 <.001

Dec 13 1520 — — — — <.002 — — .004 <.002

Jan 12, 2001 1330 .005 <.001 <.03 <.02 <.002 — — <.005 .001

Feb 16 0945 — — — — .002 — — <.005 .001

Mar 14 1115 — — — — .006 — — <.005 <.001

Apr 12 1400 — — — — .003 — — <.005 <.001

May 14 1450 — — — — .002 — — <.005 <.001

Jun 7 1135 — — — — .007 — — <.005 <.001

Sep 13 1000 — — — — .004 — — .007 <.001

Jun 6, 2002 1715 — — — — <.015 <.10 <.10 <.013 —

Date

Orthophosphate,

dissolved 

(mg/L as P)

(00671)

Phosphorus

total

(mg/L as P)

(00665)

Aluminum,

dissolved

(μg/L as AL)

(01106)

Antimony,

dissolved

(μg/L as SB)

(01095)

Barium,

dissolved

(μg/L as BA)

(01005)

Beryllium,

dissolved

(μg/L as 

BE)

(01010)

Boron,

dissolved

(μg/L as B)

(01020)

Cadmium,

dissolved

(μg/L as 

CD)

(01025)

Chromium,

dissolved

(μg/L as 

CR)

(01030)

Copper,

dissolved

(μg/L as 

CU)

(01040)

April 13, 2000 0.001 — — — — — — — — —

May 12 <.001 — 4.2 <0.2 <0.2 <0.2 <2 <0.3 <0.2 <0.2

Jun 8 <.001 — — — — — — — — —

Jul 12 .001 — — — — — — — — —

Aug 9 .001 — — — — — — — — —

Sep 14 .044 — <.3 <.2 <.2 <.2 <2 <.3 <.2 .2

Nov 16 <.007 — — — — — — — — —

Dec 13 <.007 — — — — — — — — —

Jan 12, 2001 <.007 — <.3 <.2 <.2 <.2 <2 <.3 <.2 <.2

Feb 16 <.007 — — — — — — — — —

Mar 14 <.007 — — — — — — — — —

Apr 12 <.007 — — — — — — — — —

May 14 <.007 — — — — — — — — —

Jun 7 <.007 — — — — — — — — —

Sep 13 <.007 — — — — — — — — —

Jun 6, 2002 <.007 <0.004 — — — — — — — —

Table 17. Quality-assurance data for field blanks collected in conjunction with water-quality samples in Bridgeport Valley, California.

(Back to table 1. Back to figure 1)

[mg/L, milligram per liter; μg/L, microgram per liter. —, no data. <, less than]
Tables 35

Date

Iron,

dissolved

(μg/L as FE)

(01046)

Lead,

dissolved

(μg/L as PB)

(01049)

Manganese,

dissolved

(μg/L as MN)

(01056)

Molybdenum,

dissolved

(μg/L as MO)

(01060)

Nickel,

dissolved

(μg/L as NI)

(01065)

Silver,

dissolved

(μg/L as 

AG)

(01075)

Strontium,

dissolved

(μg/L as 

SR)

(01080)

Thallium,

dissolved

(μg/L as TL)

(01057)

Zinc,

dissolved

(μg/L as 

ZN)

(01090)

Uranium

natural

dissolved

(μg/L as U)

(22703)

April 13, 2000 — — — — — — — — — —

May 12 <3 <0.3 <0.1 <0.2 <0.5 <0.2 <0.1 <0.1 2.1 <0.2

Jun 8 — — — — — — — — — —

Jul 12 — — — — — — — — — —

Aug 9 — — — — — — — — — —

Sep 14 <3 <.3 <.1 <.2 <.5 <.2 <.1 <.1 <.5 <.2

Nov 16 — — — — — — — — — —

Dec 13 — — — — — — — — — —

Jan 12, 2001 <3 <.3 <.1 <.2 <.5 <.2 <.1 <.1 <.5 <.2

Feb 16 — — — — — — — — — —

Mar 14 — — — — — — — — — —

Apr 12 — — — — — — — — — —

May 14 — — — — — — — — — —

Jun 7 — — — — — — — — — —

Sep 13 — — — — — — — — — —

Jun 6, 2002 — — — — — — — — — —

Table 17. Quality-assurance data for field blanks collected in conjunction with water-quality samples in Bridgeport Valley, California.—

Continued

[mg/L, milligram per liter; μg/L, microgram per liter. —, no data. <, less than]
Rockwell and Honeywell—Water-Quality Data for Selected Stream Sites, Bridgeport Valley, Mono County, California, April 2000 to June 2003—Data Series 89

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