BOYSEN RESERVOIR

1994 SEDIMENTATION SURVEY

ESO- - -- - -

UREC

U.S. Department of the Interior

Bureau of Reclamation
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1. AGENCY USE ONLY (Leave Blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED

September 1996 Final ____________________________

4. TITLE AND SUBTITLE 5. FUNDING NUMBERS

Boysen Reservoir

1994 Sedimentation Survey PR

6. AUTHOR(S)

Ronald L. Ferrari

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION

Bureau of Reclamation REPORT NUMBER

Technical Service Center

Denver CO 80225

9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING

Bureau of Reclamation AGENCY REPORT NUMBER

Denver Federal Center DIBR

P0 Box 25007

Denver CO 80225-0007

11. SUPPLEMENTARY NOTES

Hard copy available at the Technical Service Center, Denver, Colorado

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Available from the National Technical Information Service,

Operations Division, 5285 Port Royal Road, Springfield, Virginia 22161

13. ABSTRACT (Maximum 200 words)

Bureau of Reclamation (Reclamation) surveyed the underwater area of Boysen Reservoir in July 1994 to develop

topographic maps and compute storage-elevation relationship (area-capacity tables). The data were also used to

calculate reservoir capacity lost to sediment accumulation since dam closure in October 1951. The bathymetric

survey used sonic depth recording equipment interfaced with a GPS (global positioning system) that gave

continuous sounding positions. This survey was the first conducted by Reclamation using newly acquired GPS

equipment. Underwater topography was developed by computer program using 1994 collected data. The abovewater reservoir area was measured from the USGS quad (United States Geological Survey quadrangle) maps

developed from aerial photography and Reclamation resurvey data. The new reservoir contour map and surface

areas are a combination of hydrographic survey data and USGS aerial topography.

As of July 1994, at reservoir spillway crest elevation (feet) 4725.0, surface area was 19,602.5 acres, total capacity

was 741,594 acre-feet, and active capacity was 522,414 acre-feet. Since initial filling in October 1951, about 78,171

acre-feet of Boysen Reservoir capacity has been lost below elevation 4725.0-a 9.54-percent loss in reservoir

volume. Since 1951, average rate of reservoir capacity lost below elevation 4725.0 is 1,826.4 acre-feet per year.

14. SUBJECT TERMS- -reservoir area and capacity! sedimentation! reservoir surveys! sonar! 15. NUMBER OF PAGES

sediment distribution! contour area! reservoir area! sedimentation survey! 38

16. PRICE CODE

17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION 19. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT

OF REPORT OF THIS PAGE OF ABSTRACT

UL UL UL UIL

NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89)

Prescrfbed by ANSI Std. 239-18

298-102
BOYSEN RESERVOIR

1994 SEDIMENTATION SURVEY

by

Ronald L. Ferrari

Sedimentation and River Hydraulics Group

Water Resources Services

Technical Service Center

Denver, Colorado

September 1996
ACKNOWLEDGMENTS

The Bureau of Reclamation's Sedimentation and River Hydraulics

Group of the TSC (Technical Service Center) prepared and

published this report. Ronald Ferrari was the TSC team leader

and conducted the hydrographic survey. Richard Peic and Mike

Clausen from the Great Plains Region assisted during the

bathymetric survey and performed the required land survey for

the hydrographic data collection. Special thanks to Richard Pelc

for determining and calculating the state plane coordinates for the

original range line monuments. Ronald Ferrari completed the

data processing needed to generate the new topographic maps and

area-capacity tables. Sharon Nuanes of the TSC completed the

USGS contour digitizing and was consulted during the map

development. Lori Lest of the TSC performed the peer review of

this documentation.

U.S. Department of the Interior

Mission Statement

As the Nation's principal conservation agency, the Department of the

Interior has responsibility for most of our nationally-owned public lands

and natural resources. This includes fostering sound use of our land and

water resources; protecting our fish, wildlife, and biological diversity;

preserving the environmental and cultural values of our national parks

and historical places; and providing for the enjoyment of life through

outdoor recreation. The Department assesses our energy and mineral

resources and works to ensure that their development is in the best

interests of all our people by encouraging stewardship and citizen

participation in their care. The Department also has a major

responsibility for American Indian reservation communities and for

people who live in island territories under U.S. administration.

The information contained in this report regarding commercial

products or firms may not be used for advertising or promotional

purposes and is not to be construed as an endorsement of any

product or firm by the Bureau of Reclamation.

The information contained in this report was developed for the

Bureau of Reclamation; no warranty as to the accuracy,

usefulness, or completeness is expressed or implied.

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CONTENTS

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Page

Introduction 1

Summary and conclusions 2

Reservoir operations 3

Hydrographic survey equipment and method 3

GPS technology and equipment 4

Survey method and equipment 5

History 5

1994 survey 6

Reservoir area and capacity 7

Topography development 7

Development of 1994 contour areas 9

1994 storage capacity 9

Reservoir sediment analyses 10

Sediment longitudinal distribution 10

Sedimentation accumulation 10

References 11

Table

TABLES

1 Reservoir sediment data summary (page 1 of 2) 12

1 Reservoir sediment data summary (page 2 of 2) 13

2 Summary of 1994 survey results 14

3 State plane coordinates (page 1 of 2) 15

3 State plane coordinates (page 2 of 2) 16

Figure

FIGURES

1 Boysen Reservoir location map 17

2 Boysen Dam, plan and section 18

3 Boysen Reservoir survey data 19

4 Boysen Reservoir topographic map, No. 285-D-1362 21

5 Boysen Reservoir topographic map, No. 285-D-1363 23

6 Boysen Reservoir topographic map, No. 285-D-1364 25

7 Boysen Reservoir topographic map, No. 285-D-1365 27

8 Boysen Reservoir topographic map, No. 285-D-1366 29

9 1994 area and capacity curves 31

10 Longitudinal profile-Badwater Creek 32

11 Longitudinal profile-Cottonwood Creek 33

12 Longitudinal profile-Five Mile Creek 34

13 Longitudinal profile-Muddy Creek 35

14 Longitudinal profile-Poison Creek 36

15 Longitudinal profile-Tuff Creek 37

16 Longitudinal profile-Wind River 38

111

INTRODUCTION

Boysen Dam, Reservoir, and Powerplant are features of the Boysen Unit of the Pick-Sloan

Missouri Basin Program. The dam, located in Fremont County, Wyoming, on the Wind River,

is located about 20 miles upstream from Thermopolis, Wyoming (fig. 1). The reservoir created

by the dam is used for irrigation storage, power generation, flood and silt control, recreation,

and fish and wildlife conservation. The Bureau of Reclamation (Reclamation) and the Corps of

Engineers (Corps) cooperated in establishing the regulations for the control of the reservoir.

The Corps prescribes the regulations when storage is in the flood-control zone, and Reclamation

prescribes regulations when the storage is below the flood zone.

Investigations of this area were made by Reclamation in 1904 and again in 1916-17. In 1908,

a concrete dam (Old Boysen Dam) was constructed across the Wind River about 1.5 miles

downstream from the present dam location, primarily for power generation. A 1923 flood raised

the reservoir water surface, inundating several miles of railroad tracks and resulting in a

portion of the dam being blasted away to reduce future flooding. Repairs to the dam were never

undertaken and power generation ceased in the 1930s. The dam was removed in 1948 to

improve the tail-water conditions for the present Boysen Powerplant.

A 1939 Corps study of the Bighorn River recommended construction of a dam at the Old Boysen

Dam site. In 1941, Reclamation resumed study investigations and recommended construction

of a dam 1.5 miles upstream from the old site where relocation costs would be more reasonable.

The project was authorized by the United States 78th Congress with the Flood Control Act of

December 22, 1944. Construction began on Boysen Dam and Powerplant along with relocation

of the CB&Q Railroad on September 19, 1947, and was completed December 11, 1952. Closure

of the dam and first reservoir storage began on Oëtober 11, 1951.

Boysen Dam is an zoned earth and rockfill structure (fig. 2) with:

• a structural height* of 220 feet

• a hydraulic height of 117 feet

• a crest elevation of 4758.0 feet

• a top crest width of 30 feet

• a crest length of 1,143 feet

Boysen Dam spiliway has a crest elevation of 4725.0 at the top of the control gates with a

maximum capacity of 25,000 cubic feet per second. The spillway is located on the right

abutment of the dam and consists of:

• an unlined approach channel

• a gate structure with an ogee-type overflow weir with crest elevation 4700.0

• a hoist bridge

• a highway bridge

• two 30-foot-wide by 25-foot-high radial gates

• a concrete control house, chute, and stilling basin

• a riprap-lined inlet channel

* The definition of terms such as structural height, hydraulic height, etc., may be found in manuals such as

Reclamations Design of Small Dams and Guide for Preparation of Standing Operating Procedures for Dams and

Reservoirs, or ASCEs Nomenclature for Hydraulics.
The river outlet works is located on the right abutment, has a capacity of 1,300 ft3/s at elevation

4725.0, and consists of:

• an intake trashrack

• a 57-inch branch outlet pipe from the 15-foot-diameter penstock

• a 66-inch-diameter outlet pipe

• a 48-inch ring-follower gate

• a 48-inch hollow-jet valve in each of the two outlet pipes

• a stilling basin

• a downstream river channel

The powerplant is located on the right bank of the river, adjacent to the spillway, and at the

downstream toe of the embankment. The capacity is 15,000 kilowatts developed by two 7,500-

kilowatt units operating at an average head of 99 feet. Each unit is served by a 10-foot-diameter

steel penstock joined to a common 15-foot-diameter steel penstock immediately upstream from

the powerplant.

The original reservoir survey measured a surface area of 19,660 acres at reservoir spillway crest

elevation 4725.0. The original calculated total capacity at reservoir elevation 4725.0 was

819,132 acre-feet, of which 146,652 acre-feet was joint use, 413,241 acre-feet was active

conservation space, and 259,239 acre-feet was inactive and dead storage. An additional

surcharge storage capacity of about 671,000 acre-feet is available between spillway crest

elevation 4725.0 and the design maximum water surface of 4752.0. At elevation 4725.0, the

reservoir length is around 18 miles and has an average width of 1.7 miles.

SUMMARY AND CONCLUSIONS

This Reclamation (Bureau of Reclamation) report presents the 1994 results of the second

extensive survey of Boysen Reservoir. The primary objectives of the survey were to gather data

needed to:

• develop underwater topography

• compute area-capacity relationships

• estimate storage depletion caused by sediment deposition since closure of Boysen Dam

The bathymetric survey was run using sonic depth recording equipment interfaced with a DGPS

(differential global positioning system) capable of determining sounding locations within the

reservoir. The system continuously recorded depth and horizontal coordinates as the survey

boat was navigated along grid lines covering Boysen Reservoir. The positioning system provided

information to allow the boat operator to maintain course along these grid lines. Water surface

elevations recorded by a Reclamation gage during the time of collection were used to convert the

sonic depth measurements to true reservoir bottom elevations.

The above-water Boysen Reservoir areas were measured from digitized USGS quad maps of the

reservoir along with resurvey data from several of the original sedimentation range lines located

above the 1994 reservoir water surface. The new topographic map of Boysen Reservoir is a

combination of underwater measured topography, digitized map contours, and range line survey

data. The 1994 underwater surface areas at predetermined 5-foot contour intervals were

generated by a computer graphics program using the collected data. The area and capacity

tables were produced by a computer program that uses measured contour surface areas and a

2
curve-fitting technique to compute area and capacity at prescribed elevation increments.

Tables 1 and 2 contain a summary of the Boysen Reservoir sedimentation and watershed

characteristics for the 1994 survey. The 1994 survey determined that the reservoir has a total

storage capacity of 741,594 acre-feet and a surface area of 19,602.5 acres at water surface

elevation 4725.0. Since closure in October 1951, the reservoir has accumulated an estimated

volume of 78,171 acre-feet of sediment below elevation 4725.0. This volume represents an 9.54-

percent loss in total capacity and an average loss of 1,826.4 acre-feet per year.

RESERVOIR OPERATIONS

The reservoir is a multi-use facility having (following values are from July 1994 area-capacity

tables):

• 525,110 acre-feet of surcharge storage between elevations 4,732.0 and 4,752.0.

• 146,201 acre-feet of flood control storage between elevations 4,725.0 and 4,732.0.

• 144,229 acre-feet of joint storage between elevations 4,717.0 and 4,725.0.

• 378,184 acre-feet of conservation storage between elevations 4,685.0 and 4,717.0.

• 219,181 acre-feet of inactive and dead storage below elevation 4,685.0.

Boysen Reservoir receives the majority of its inflow from the Wind River. Available records for

years 1952 through 1994 show that the average unregulated inflow into the reservoir was

1,018,293 acre-feet per year. This average would compute to a mean annual runoff of 2.48

inches for the 7,700 square mile basin. The inflow and end-of-month stage records in table 1

show the annual fluctuation of the reservoir. After initial filling to spillway crest elevation

4725.0 in 1954, available records show Boysen Reservoir operation ranging from elevation

4,684.2 in 1956 to elevation 4,730.8 in 1967.

HYDROGRAPHIC SURVEY EQUIPMENT AND METHOD

The hydrographic survey equipment was mounted in the cabin of a 24-foot tn-hull aluminum

vessel equipped with twin in-board motors. The hydrographic system contained on the survey

vessel consisted of a GPS (global positioning system) receiver with a built-in radio and

omnidirectional antenna, a dual frequency depth sounder, a helmsman display for navigation,

a plotter, a computer, and hydrographic system software for collecting the underwater data.

Power to the equipment was supplied by an on-board generator.

The shore equipment included a second GPS receiver with a built-in radio and an

omnidirectional antenna. The GPS receiver and antenna were mounted on a survey tripod over

a known datum point. The power for the shore units was provided by a 12-volt battery. To

obtain the maximum radio transmission range, known datum points high above the water

surface were selected.

3
GPS Technology and Equipment

The positioning system used at Boysen Reservoir was NAVSTAR (NAVigation Satellite Timing

and Ranging) GPS, an all weather, radio based, satellite navigation system that enables users

to accurately detennine three-dimensional position. The NAVSTAR system's primary mission

is to provide passive global positioning and navigation for land, air, and sea based strategic and

tactical forces and is operated and maintained by the DOD (Department of Defense). The GPS

receiver measures the distances between the satellites and itself and determines the receiver's

position from intersections of the multiple range vectors. Distances are determined by

accurately measuring the time a signal pulse takes to travel from the satellite to the receiver.

The NAVSTAR system consists of three segments:

• The space segment is a network of 24 satellites maintained in precise orbits, about 10,900

nautical miles above the earth, each completing an orbit every 12 hours.

• The ground control segment tracks the satellites, determining their precise orbits.

Periodically, the ground control segment transmits correction and other system data to all

the satellites, which are then retransmitted to the user segment.

• The user segment is the GPS receivers, which measure the broadcasts from the satellites

and calculate the position of the receivers.

The GPS receivers use the satellites as reference points for triangulating their position on earth.

The position is calculated from distance measurements to the satellites that are determined by

how long a radio signal takes to reach the receiver from the satellite. To calculate the receiver's

position on earth, the satellite distance and the satellite's position in space are needed. The

satellites transmit signals to the GPS receivers for distance measurements along with the data

messages about their exact orbital location and operational status. The satellites transmit two

"L" band frequencies for the distance measurement signal called Li and L2. At least four

satellite observations are required to mathematically solve for the four unknown receiver

parameters (latitude, longitude, altitude, and time). The time unknown is caused by the clock

error between the expensive satellite atomic clocks and the imperfect clocks in the GPS

receivers. For hydrographic surveying the altitude, Boysen Reservoir's water surface elevation

parameter was known, which realistically meant only three satellite observations were needed

to track the survey vessel. During the Boysen Reservoir survey, a minimum of five satellites

were used for position calculations; most of the time the best six available satellites were used.

The GPS receiver's absolute position is not as accurate as it appears in theory because of the

function of range measurement precision and geometric position of the satellites. Precision is

affected by several factors-time, because of the clock differences, and atmospheric delays

caused by the effect on the radio signal by the ionosphere. GDOP (geometric dilution of

precision) describes the geometric uncertainty and is a function of the relative geometry of the

satellites and the user. Generally, the closer together in angle two satellites are from the

receiver, the greater the GDOP. GDOP is broken into components: PDOP is position dilution

of precision (x,y,z), and HDOP is horizontal dilution of precision (x,y). The components are

based only on the geometry of the satellites. The PDOP and HDOP were monitored during the

Boysen Reservoir Survey, and for the majority of the time they were less than 3, which is within

the acceptable limits of horizontal accuracy for Class 1 and 2 level surveys.
An additional and larger error source of GPS collection is caused by false signal projection,

called S/A (selective availability). The DOD implements S/A to discourage the use of the

satellite system as a guidance tool by hostile forces. Positions determined by a single receiver

when S/A is active can have errors of up to 100 meters.

A method of collection to resolve or cancel the inherent errors of GPS (satellite position or S/A,

clock differences, atmospheric delay, etc.) is called DGPS (differential GPS). DGPS was used

during the Boysen Reservoir survey to determine positions of the moving survey vessel in real

time. DGPS determines the position of one receiver in reference to another and is a method of

increasing position accuracies by eliminating or minimizing the uncertainties. Differential

positioning is not concerned with the absolute position of each unit but with the relative

difference between the positions of two units, which are simultaneously observing the same

satellites. The inherent errors are mostly canceled because the satellite transmission is

essentially the same at both receivers.

At a known geographical benchmark, one GPS receiver is programmed with the known

coordinates and stationed over the geographical benchmark. This receiver, known as the master

or reference unit, remains over the known benchmark, monitors the movement of the satellites,

and calculates its apparent geographical position by direct reception from the satellites. The

inherent errors in the satellite position are determined relative to the master receiver's

programmed position, and the necessary corrections or differences are transmitted to the mobile

GPS receiver on the survey vessel. For the Boysen Reservoir survey, position corrections were

determined by the master receiver and transmitted via a UHF (ultra-high frequency) radio link

every 3 seconds to the survey vessel mobile receiver. The survey vessel's GPS receiver used the

corrections along with the satellite information it received to determine the vessel's differential

Jocation. Using DGPS resulted in positional accuracies of 1 to 2 meters for the moving vessel

ompared to positional accuracies of 100 meters with a single receiver.

The TSC (Technical Service Center) mobile and reference GPS units are identical in construction

and consist of a 6-channel Li C/A code continuous parallel tracking receiver, an internal modem,

and a UHF radio transceiver. The differential corrections from the reference station to the

mobile station are transmitted using the industry standard RTCM (Radio Technical Commission

for Maritime Services) message protocol via the UHF radio link. The programming to the

mobile or reference GPS unit is accomplished by entering necessary information via a notebook

computer. The TSC's GPS system has the capability of establishing or confirming the land base

control points by using notebook computers for logging data and post-processing software. The

GPS collection system has the capability of collecting the data in 1927 or 1983 NAD (North

American Datums) in the surveyed area's state plane coordinate system zone, which for the

1994 Boysen Reservoir sedimentation survey was Wyoming's 1927 NAD west central state plane

zone.

Survey Method and Equipment

HLstory.-The original Boysen Reservoir strip topography was obtained by a 1944 planetable

survey. The original 5-foot surface areas were measured from the reservoir topography, mapped

at a scale of one inch equals two thousand feet. A sedimentation network of 75 range lines were

established from 1949 through 1952 by transit, chain, and level techniques. For the 1964

sedimentation survey, the original 75 range lines were resurveyed by land and bathymetric

survey methods. To better define the sedimentation in the main reservoir area, seven additional

range lines were established in 1964. The 1964 volume of accumulated sediment in Boysen
Reservoir was computed from the surveyed 82 range lines using the constant-factor method.

A detailed description of the collection and analysis methods is outlined in a previous

Reclamation (1965) report.

1994 Survey.-The Boysen Reservoir hydrographic survey was completed using the contour

method as outlined by Blanton (1982). The procedure involved collecting adequate coordinate

data for developing a reliable contour map by bathymetric survey methods. The bathymetric

survey was run using sonic depth recording equipment interfaced with a DGPS capable of

determining sounding locations throughout the reservoir. This reservoir survey was the first

conducted by Reclamations Sedimentation Group using the newly acquired DGPS equipment.

The original range line horizontal grid system was established in a local coordinate system. The

original triangulation range line network was tied to a known USGS bench mark, labeled

Bigllorn, with assumed coordinates of 100,000 North and 50,000 East. To use the hydrographic

GPS collection system the range line coordinate network and benchmarks for the shore base

GPS unit needed to be in state plane coordinates. Using the known state plane coordinates for

BigHorn benchmark and the original triangulation information, the Reclamation Cody Office

computed the state plane coordinates for the range line network in Wyoming's 1927 NAD west

central zone. The resulting computations are listed in table 3. Additional verification of the

computations was obtained by the hydrographic survey crew by performing a static survey using

the GPS receivers. During the hydrographic collection four master GPS shore station locations

were used for relaying correction information to the survey vessel, with the Bigllorn benchmark

being one of them.

The Boysen Reservoir bathymetric survey took a total of 10 days starting on July 19, 1994, and

concluding on July 28, 1994. During this time the water surface of the reservoir ranged from

elevation 4711.9 to 4712.8. The survey system software was capable of recording depths and

horizontal coordinates at 1-second increments as the survey boat moved along predetermined

grid lines covering the reservoir. To produce adequate data for developing contours of Boys en

Reservoir, the original range lines accessible by the survey boat were collected along with

parallel grid lines at a spacing of 400 feet. The data were collected at 2-second intervals, and

additional data were collected along the shore as the boat traversed to the next transect. The

survey vessel's guidance system gave directions to the boat operator to assist in maintaining

course along these predetermined grid lines. During each nm, the depth and position data were

recorded on the notebook computer hard drive for subsequent processing by TSC personnel. A

graph plotter was used in the field to track the boat and ensure adequate coverage during the

collection process. The underwater data set includes 113,000 data points and is illustrated on

figure 3. Water surface elevations recorded by a Reclamation gage at the dam were used to

convert the sonic depth measurements to true lake bottom elevations.

The TSC's depth sounder has a 208-kilohertz transducer that reflects the first bottom surface,

which is used for sediment surveys. The bottom is determined by measuring elapsed time

between the transmission of the sound pulse from the transducer to the waterway bottom and

the reception of its echo back to the transducer. Prior to data collection and periodically through

the survey the depth sounder was calibrated by lowering a deflector plate below the boat by

cables with known depths marked by beads. The depth sounder was calibrated by adjusting the

speed of sound which can vary due to water density, salinity, temperature, turbidity, and other

conditions. The accuracy of an instantaneous reading from the depth finder is estimated to be

±0.5 feet, but these errors are minimized over the entire survey. The estimated accuracy takes

into consideration calibration error and the collection of depth data when the boat is moving.
The collected data were digitally transmitted to the computer collection system via an RS232

port. The depth sounder also produces an analog hard copy chart of the measured depths.

These graphed analog charts were printed for all survey lines as the data were collected and

recorded by the computer. The charts were analyzed during post processing, and when the

analog charted depths indicated a difference from the recorded computer bottom depths, the

computer data files were modified.

In September 1994, the range lines located above water-lO, bA, lOB, 11, 12, 12A, 13, 14, 22,

23, 31, 32, 41, 42, 43, 51, 52, 61, 62, 63, 70, and 71-were surveyed by the Great Plains Region

using standard surveying procedures. The range lines are located on the main river and

tributaries in the delta areas of the upper portion of the reservoir. The survey found the delta

areas to be fairly flat, which was also observed by the hydrographic crew during the underwater

collection. The collected data were converted into state plane coordinates using the known end

point values. The state plane coordinates for the end points of range lines bA, lOB, and 12A

that were established during the 1964 survey were projected from plotted locations of the range

lines on the USGS quad maps. The state plane data points were part of the data set used to

produce the topographic contours.

RESERVOIR AREA AND CAPACITY

Topography Development

The topography of Boysen Reservoir was developed from the 1994 collected data and from the

USGS quads (7.5-minute quadrangle maps). The upper contours of Boysen Reservoir were

developed by digitizing the elevation 4725.0 and 4740.0 contour lines from the USGS quad maps

that cover the reservoir area. These USGS quad maps were dated 1956 and photorevised in

1978 and 1980. ARC/INFO V7.0.2 geographic information system software was used to digitize

the USGS quad contours. The digitized contours were transformed to state plane coordinates

using the ARC/INFO PROJECT command.

The digitized area of the USGS contour, elevation 4740.0, that encloses the reservoir area was

around 25,210 acres or 99.0 percent of the original measured area of 25,450 acres. Removing

the island areas within this enclosed contour gave a surface area of around 24,500 acres or

around 96 percent of the original area. The difference can be attributed to several factors, such

as surface area measuring methods or different methods used to develop the

topography-original method by planetable survey with 5-foot contours and USGS method by

aerial photography with 20-foot contours. For the purpose of the 1994 sedimentation study, the

original areas above elevation 4725.0 were used as the base for surface area development. The

1994 land survey of the range lines located above elevation 4725.0 found minor differences from

the original and 1964 survey results indicating little change. For the purpose of computing the

1994 capacity above elevation 4725.0, the 1964 resulting surface areas for elevations 4730.0,

4735.0, 4740.0, 4745.0 and 4752.0 were used.

The digitized area of contour elevation 4725.0, shaded blue on the USGS quad maps, was

around 19,730 acres, or 100.4 percent of the original measured area of 19,660 acres. For the

1994 study, the original 4725.0 contour, as presented on the USGS quad maps, was adjusted on

the Wind River and several of the tributaries using the 1994 above water range line survey data.

Removing the island areas within the adjusted elevation 4725.0 clip found an area of 19,602.5

acres or around 99.7 percent of the original area. This computed area was used for the 1994

study results.

7
Contours for elevations below 4,725.0 were computed from collected underwater data using the

TIN (triangular irregular network) surface modeling package within ARC/INFO. The

underwater survey data were collected in the Wyoming west central zone state plane

coordinates in NAD 1927. The collected underwater data ranged in elevation from around

4622.0 to 4710.0. A TIN is a set of adjacent, non-overlapping triangles computed from

irregularly spaced points with x,,y coordinates and z values. TIN was designed to deal with

continuous data such as elevations.

The TIN software uses a method know as Delaunay's criteria for triangulation. Triangles are

formed between all data points, including all boundary points. This method preserves all

collected survey points. The method requires that a circle drawn through the three nodes of a

triangle will contain no other point. This requirement means that sample points are connected

to their nearest neighbors to form triangles. Elevation contours are then interpolated along the

triangle elements. The TIN method is discussed in great detail in the ARC/INFO V7.0.2 users

documentation.

The adjusted elevation 4,725.0-foot contour that was digitized from USGS quad maps was used

to perform the clip of the Boysen Reservoir TIN such that interpolation was not allowed to occur

outside of the 4,725.0-foot contour. This clip was performed using the hardclip option of the

ARC/INFO CREATETIN command. In creating the TIN, points that fell within a set distance

of each other were weeded out to eliminate flat triangular elements. Flat triangles occur where

all three points making up a triangle have the same elevation. Elimination of redundant points

helped to improve the performance of the contouring process as well as helped to create more

continuous contours in the lower elevations of the reservoir.

Incomplete upper contour development occurred because of the limited data between the

underwater data (that ended around elevation 4710.0) and the 1994 above water range line data

and the digitized 4725.0 clip. The 1994 above water range line data caused islands to develop,

not the continuous contours that actually existed. This development was caused by the large

distances between the range lines. To correct this problem, additional elevation points,

interpreted from the 1994 range line data and the USGS 4725.0 contour clip, were added using

the ARCEDIT commands. This method required the engineer to interpret elevations between

the range lines, but inherit errors caused by this method were greatly reduced because of the

flat sediment delta conditions that existed in the upper reservoir areas.

Island contours also occurred in the lower reservoir area from the dam upstream through the

narrow canyon portion of the reservoir. This condition occurred because the stream meandered

from canyon wall to canyon wall. The contour program could have completed the meandering

channel contours for the affected contour elevations 4730.0 and 4735.0 if the area had been

saturated with additional data. Computed island areas for these elevations are assumed to be

only slightly less than if additional data were collected. Also, these areas are a small percentage

of the overall reservoir area and have little effect on the overall sediment computations.

The linear interpolation option of the ARC/INFO TINCONTOUR command was used to

interpolate contours from the Boysen Reservoir TIN. In addition, the contours were generalized

by weeding out vertices along the contours. This generalization process improved the

presentability of the resulting contours by removing very small variations in the contour lines.

This generalization had no bearing on the computation of surface areas and volumes for Boysen

Reservoir. The contour topography at 5-foot intervals is presented on figures 4 through 8 (map

numbers 285-D-1362 through 285-D-1366).

8
Development of 1994 Contour Areas

The 1994 contour surface areas for Boysen Reservoir were computed in 0.1-foot intervals from

elevation 4622.0 to 4725.0 using the Boysen Reservoir TIN discussed above. These calculations

were performed using the ARC/INFO VOLUME command. This command computes areas at

user specified elevations directly from the TIN and takes into consideration all regions of equal

elevation.

1994 Storage Capacity

The storage-elevation relationships based on the measured surface areas were developed using

the area-capacity computer program ACAP (Bureau of Reclamation, 1985). The 1994 surface

areas at 5-foot contour intervals from elevation 4622.0 to 4725.0 and the 1964 survey results for

the 5-foot contour interval from elevation 4730.0 to 4745.0 and elevation 4752.0 were used as

the control parameters for computing the Boysen Reservoir capacity. The program can compute

an area and capacity at elevation increments of 0.01 to 1.0 foot by linear interpolation between

the given contour surface areas. The program begins by testing the initial capacity equation

over successive intervals to ensure that the equation fits within an allowable error limit, which

was set at 0.000001 for Boysen Reservoir. This capacity equation is then used over the full

range of intervals fitting within this allowable error limit. For the first interval at which the

initial allowable error limit is exceeded, a new capacity equation (integrated from basic area

curve over that interval) tests the fit until it also exceeds the error limit. Thus, the capacity

curve is defined by a series of curves, each fitting a certain region of data. Final area equations

are derived by differentiating the capacity equations, which are of second order polynomial form:

y = a1 + ax + a3x2

where:

y = capacity

x = elevation above a reference base

a1 = intercept

a2 and a3 = coefficients

Results of the 1994 Boysen Reservoir area and capacity computations are listed in tables 1 and

2 and plotted on figure 9. A separate set of 1994 area and capacity tables was published for the

0.01-, 0.1-, and 1-foot elevation increments (Bureau of Reclamation, 1996). A description of the

computations and coefficients output from the ACAP program is included with these tables.

Computation results are listed in columns (5) and (6) of table 2. Column (2) in the table gives

the original measured contour areas used in the original area and capacity computation, and

column (3) gives the original capacity recomputed using ACAP. Both the original and 1994 area

and capacity curves are plotted on figure 9. As of July 1994, at spiliway crest elevation 4725.0

feet, the surface area was 19,602.5 acres with a total capacity of 741,594 acre-feet.

9
RESERVOIR SEDIMENT ANALYSES

Sediment Longitudinal Distribution

The distribution of sediment throughout the length of the reservoir is illustrated by plots of the

thaiweg profile representing the original (1951), 1964, and 1994 resurveyed profiles for

Badwater, Cottonwood, Five Mile, Muddy, Poison, and Tuff Creeks and for the Wind River

(figs. 10 through 16). Thalweg elevations representing the original and 1964 profiles and the

river channel distances of the range line locations were scaled from the thaiweg profiles

presented in the 1964 sedimentation report (Bureau of Reclamation, 1965). The average

thaiweg elevation for the 1994 resurvey profile was measured from the above water range line

collected data and from the developed ARC/INFO developed TIN. For the range lines collected

during the underwater collection, the STACKPROFILE option within ARC/INFO was used to

develop cross sections of the range line location. This option required the state plane end points

of the range lines and displayed on screen the cross sections where the average elevation could

be interpreted. Except for some minor inaccuracies, these plots closely represent the channel

bottom conditions at the time of the survey. The channel distances for the Wind River start at

the dam and for each creek start at the river and creek confluence.

Sedimentation Accumulation

Since storage began in October 1951, sediments have accumulated in Boysen Reservoir to an

estimated volume of 78,171 acre-feet below spiliway crest elevation 4725.0. The average annual

rate of deposition was 1,826.4 acre-feet per year, or 0.24 acre-foot per square mile from the

sediment contributing drainage area. The storage loss in terms of percent of original storage

capacity was 9.54 percent.

Tables 1 and 2 contain the Boysen Reservoir sediment accumulation and water storage data

based on the 1994 resurvey. The 1994 study based its sediment calculations on the difference

between the original and 1994 measured reservoir capacities and accounts for the sediment

accumulation during the 42.8 years of reservoir operation.

10
REFERENCES

American Society of Civil Engineers, Nomenclature for Hydraulics, ASCE Headquarters, New

York, 1962.

Blanton, J.O. III, Procedures for Monitoring Reservoir Sedimentation: Technical Guideline for

Bureau of Reclamation, Denver Office, Denver, CO, October 1982.

Bureau of Reclamation, The 1964 Sedimentation Survey of Boysen Reservoir Wyoming, Denver

Office, Denver, Colorado, 1965.

Bureau of Reclamation, Surface Water Branch, ACAP85 Users Manual, Denver Office, Denver,

Colorado, 1985.

Bureau of Reclamation, Guide for Preparation of Standing Operating Procedures for Bureau

ofReclamation Dams and Reservoirs, U.S. Government Printing Office, Denver, CO, 1987a.

Bureau of Reclamation, Design of Small Dams, U.S. Government Printing Office, Denver, CO,

1987b.

Bureau of Reclamation, Denver Office, Boysen Reservoir Area and Capacity Tables, Boysen Unit,

Great Plains Region, Denver, CO, September 1996.

Environmental Systems Research Institute, Inc., ARC Command References, 1992.

11
Table 1. - Reservoir sediment data summary (page 1 of 2).

RESERVOIR SEDIMENT

DATA SUMMARY Boysen Reservoir

NAME OF RESERVOIR .1

DATA SHEET NO.

O 1. OWNER Bureau of Reclamation 2. STREAM Wind River 3. STATE Wyoming

A 4. SEC. 16 TWP. SN RANGE 6E 5. NEAREST P.O. Thermopolis 6. COUNTY Fremont

M 7. LAT 43° 25 00 LONG 108° 10 37 8. TOP OF DAN ELEVATION 4,758 9. SPILLWAY CREST EL. 4,725

R 10. STORAGE 1].. ELEVATION 12. ORIGINAL 13. ORIGINAL 14. GROSS STORAGE 15. DATE

E ALLOCATION TOP OF POOL SURFACE AREA, Ac CAPACITY, AR ACRE- FEET STORAGE

S BEGAN

E

a. SURCHARGE 4,752 30,856 520,686 1,490,246

R b. FLOOD CONTROL 4,732 22,100 150,428 969,560

10/11/51 V

c. POWER 4,725° 19,660 146,652 819,132 ______________

I d. WATER SUPPLY 16. DATE

R NORMAL

e. IRRI ATION _________________ ___________________ OPERATION

f. CONSERVATION

_________________

4,717

__________________

17,079 413,241 672,480 BEGAN

g. INACTIVE 4,685' 9,444 259,239 259,239°

_____________

-

17. LENGTH OF RESERVOIR 18 MILES AVG. WIDTH OF RESERVOIR 1.7 MILES

B 18. TOTAL DRAINAGE AREA 7,700 SQUARE MILES 22. MEAN ANNUAL PRECIPITATION 9.5 INCHES

19. NET SEDIMENT CONTRIBUTING AREA 7,670 SQUARE MILES 23. MEAN ANNUAL RUNOFF 2.48° INCHES

I 20. LENGTH 150 MILES AV. WIDTH 51 MILES 24. MEAN ANNUAL RUNOFF 1,018,293° ACRE-FEET

N 21. MAX. ELEVATION 13,785 MIN. ELEVATION 4,607 25. ANNUAL TEMP. MEAN 47°F4 RANGE 108°F to -37F'

5 26. DATE OF 27. 28. 29. TYPE OF 30. NO. OF 31. SURFACE 32. CAPACITY 33. C/I

U SURVEY PER. ACCL. SURVEY RANGES OR AREA, AC. ACRE-FEET RATIO AF AS

R YRS. YRS. INTERVAL

10/11/51 Contour (0) 5-ft 19 , 660 819 , 765'

Y 8/1/64 12.8 12.8 Range (0) 82 19,560 802,000°

7/28/94 30.0 42.8 Contour (0) 5-ft 19,602.5 741,594°

0

A _________________________________

T

_________________

26. DATE OF

_______________

34. PERIOD

________________________________________________

35. PERIOD WATER INFLOW, ACRE FEET WATER INFLOW TO DATE, AS

A SURVEY ANNUAL

PRECIP.

a. MEAN ANN. b. MAX. ANN. J

c. TOTAL a. MEAN ANN. b. TOTAL

8/1/64 8-48 972,505° 1,505,681° 12,448,069° 972,505° 12,448,069

7/28/94 9,54 1,055,547° 1,676,565° 31,666,4006 1,018,293° 43,582,940'

26. DATE OF 37. PERIOD CAPACITY LOSS, ACRE-FEET 38. TOTAL SEDIMENT DEPOSITS TO DATE, AS

SURVEY

a. TOTAL b. AV. ANN. c. /MI.°-YR. a. TOTAL b. AV. ANNUAL c. /MI.-YR

8/1/64 17,129 1,338 0.17 17,129 1,338.0 0.17

7/28/94 60,406 3,512 0.46 78,171 1,826.4 0.24

26. DATE OF 39. AV. DRY 40. SED. DEN. TONS/MI.°-YR. 41. STORAGE LOSS, PCT. 42. SEDIMENT

SURVEY MT. (#/FT°) INFLOW, PPM

a. PERIOD b. TOTAL TO a. AV. b. TOTAL TO a. b.

DATE ANNUAL DATE PER. TOT,

8/1/64 83.0 307 307 0.163 2.09 1,830 1,83

7/28/94 - - - 0.223 9.54 - -

26. - 43. DEPTH DESIGNATION RANGE IN FEET BELOW, AND ABOVE, CREST ELEVATION

DATE

OF 110-80 80-70 70-60 60-50 50-40 40-30 30-20 20-10 10- CREST

SURVEY

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN DEPTH DESIGNATION

7/94 14.6 10.5 7.8 8.2 10.5 8.9 15.4 18.3 5.8 0.0

26. 44. REACH DESIGNATION PERCENT OF TOTAL ORIGINAL LENGTH OF RESERVOIR

DATE 0-10 10- 20- 30- 40- 50- 60- 70- 80- 90- 100- 105- 110- 115- 120-

SURVEY 20 30 40 50 60 70 80 90 100 105 110 115 120 125

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN REACH DESIGNATION

12
Table 1. - Reservoir sediment data summary (page 2 of 2).

45. RANGE IN RESERVOIR OPERATION

WATER YEAR MAX. ELEV. MIN. ELEV. INFLOW, AF YEAR MAX . ELEV. MIN. ELEV. INFLOW, AF

1952 4721.4 4,680.0 914,958

1953 4,720.2 4,705.6 811,209 1954 4,725.2 4,712.0 889,855

1955 4,721.4 4,703.3 600,735 1956 4,724.7 4,684.2 1,161,817

1957 4,729.8 4,702.5 1,480,525 1958 4,723.2 4,701.7 988,470

1959 4,716.6 4692.6 732,703 1960 4,702.8 4,686.4 505,436

196]. 4,708.3 4,686.6 639,073 1962 4,725.0 4696.7 1,196,952

1963 4,727.6 4,711.8 1,072,100 1964 4,725.1 4,703.6 983,913

1965 4,727.3 4,704.4 1,534,473 1966 4,724.3 4,711.3 675,187

1967 4,730.8 4,706.9 1,676,565 1968 4,724.9 4,704.9 1,088,719

1969 4,724.6 4,707.8 1,065,882 1970 4,721.3 4,700.9 840,425

1971 4,727.1 4,695.7 1,498,884 1972 4,725.3 4,707.0 1,409,535

1973 4,725.4 4,706.7 1,221,488 1974 4,725.2 4,708.8 1,317,685

1975 4.726.4 4,706.5 1,224,011 1976 4,721.7 4,697.7 1,077,724

1977 4,722.1 4,705.0 485,002 1978 4,726.2 4,701.5 1,207,560

1979 4,721.8 4,706.5 882,266 1980 4,726.9 4,708.4 1,129.341

1981 4,722.1 4,711.1 822,569 1982 4,725.4 4,702.2 1,077,651

1983 4,727.9 4,707.1 1,632,122 1984 4,725.0 4,709.5 1,265,023

1985 4,722.6 4,709.8 760,921 1986 4,725.6 4,704.8 1,461,928

1987 4,723.1 4,711.0 980,236 1988 4,721.8 4,703.8 523,304

1989 4,719.3 4,703.7 681,730 1990 4,717.6 4,710.0 681,252

1991 4,729.2 4,712.7 1,279,569 1992 4,719.9 4,709.4 620,178

1993 4,725.3 4,712.0 996,047 1994' 4,720.1 4,711.9 487,917

46. ELEVATION - AREA - CAPACITY DATA FOR 1994 CAP?.CITY __________

ELEVATION AREA CAPACITY ELEVATION AREA CAPACITY ELEVATION AREA CAPACITY

4622 0.0 0 4665 5,542.5 78,903 4710 13,820.1 492,696

4625 4.0 6 4670 6,231.7 108,338 4715 15,376.0 565,686

4630 43.6 125 4675 6,923.3 141,226 4720 17,692.4 648,357

4635 144.7 596 4680 7,774.9 177,971 4725 19,602.5 741,594

4640 392.0 1,938 4685 8,708.8 219,181 4730 21,449' 844,223

4645 1,273.2 6,101 4690 9,480.3 264,653 4735 23,133' 955,678

4650 2,743.5 16,142 4695 10,364.1 314,264 4740 25,456' 1,077,151

4655 3,708.0 32,271 4700 11,240.3 368,275 4745 27,353' 1,209,173

4660 4,701.1 53,294 4705 12,353.9 427,261 4752 30,856' 1,412,905

47. REMARKS AND REFERENCES

Top of movable spiliway gates.

Joint Use-- Flood control and conservation.

Includes dead storage be low elevation 4,657.0.

USER Project Data nook, 1981.

Calculated from mean annual runoff value, 1,018,293 acre-ft, Item 24.

Unregulated monthly infl ow records from March 1952 through July 1994. 1964 values from 1964 sediment ation

survey.

Capacity at elevation 47 25.0, spillway crest. Area and capacity calculated by Bureau of Reclamation program ACAP

using orig inal surface area values.

For October 1993 through July 1994.

Computed areas from 1964 survey.

48. AGENCY MAKING SURVEY Bureau of Reclamation

49. AGENCY SUPPLYING DATA Bureau of Reclamation DATE August 1996

13
Table 2. - Summary of 1994 survey results.

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)

1951 1951 1964 1964 1994 1994 Sediment

Elevation Area Capacity Area Capacity Area Capacity Volume Percent Percent

(ft) (acres) (acre-ft) (acres) (acre-ft) (acres) (acre-ft) (acre-il) Sediment Depth

4752.0 30,894 1,491,924 30,856 1,473,204 30,856* 1,412,905 79,019 100.0

4745.0 27,380 1,287,965 27,353 1,269,473 27.353* 1,209,173 78,792 - 94.9

4740.0 25,450 1155,890 25,456 1,137,450 25,456 1,077,151 78,739 - 91.2

4735.0 23,210 1,034,240 23,133 1,015,978 23,133k 955,678 78,562 - 87.6

4730.0 21,460 922,565 21,449 904,522 21,449* 844,223 78,342 - 83.9

4725.0 19,660 819,765 19,560 802,000 19,602.5 741,594 78,171 100.0 80.3

4720.0 17,990 725,640 17,951 708,222 17,692.4 648,357 77,283 98.9 76.6

4715.0 16,510 639,390 16,303 622,588 15,376.0 565,686 73,704 94.2 73.0

4710.0 15,220 560,065 14,807 544,812 13,820.1 492,696 67,369 86.2 69.3

4705.0 14,160 486,615 13,727 473,478 12,353.9 427,261 59,354 75.9 65.7

4700.0 12,410 420,190 12,363 408,252 11,240.3 368,275 51,915 66,4 62.0

4695.0 11,040 361,565 10,693 350,612 10,364.1 314,264 47,301 60.5 58.4

4690.0 10,170 308,540 9,650 299,755 9,480.3 264,653 43,887 56.1 54.7

4685.0 9,444 259,505 9,277 252,438 8,708.8 219,181 40,324 51.6 51.1

4680.0 8,605 214,383 8,523 207,938 7,774.9 177,971 36,412 46.6 47.4

4675.0 7,816 173,330 7,488 167,910 6,923.3 141,226 32,104 41.1 43.8

4670.0 6,821 136,738 6,535 132,852 6,231.7 108,338 28,400 36.3 40,1

4665.0 6,011 104,658 5,882 101,810 5,542.5 78,903 25,755 32.9 36.5

4660.0 5,317 76,338 5,087 74,388 4,701.1 53,294 23,044 29.5 32.8

4655.0 4,469 51,873 4,280 50,970 3,708.0 32,271 19,602 25.1 29.2

4650.0 3,351 32,323 3,418 31,725 2,743.5 16,142 16,181 20.7 25.5

4645.0 2,588 17,475 2,422 17,125 1,273.2 6,101 11,374 14.6 21.9

4640.0 1,099 8,258 1,263 7,912 392.0 1,938 6,320 8.1 18.2

4635.0 641 3,908 577 3,312 144.7 596 3,312 4.2 14.6

4630.0 293 1,573 265 1,208 43.6 125 1,448 1.8 10.9

4625.0 135 503 83 338 4.0 6 497 0.6 7.3

4622.0 74 189 140 0.0 0 189 0.2 5.1

4620.0 33 83 26 65 0.0 0 83 0.1 3.6

4615.0 0 0 0 0 0.0 0 0 0.0 0.0

(1) Elevation of reservoir water surface.

(2) Original reservoir surface area measured in 1951.

(3) Original (1951) calculated reservoir capacity computed using ACAP from original measured surface areas.

(4) Reservoir surface area from 1964 survey.

(5) 1964 calculated reservoir capacity computed using ACAP from 1964 measured surface areas.

(6) Reservoir surface area from 1994 survey.

(7) 1994 calculated reservoir capacity computed using ACAP from 1994 surface areas

(8) 1994 measured sediment volume = column (3) - column (7).

(9) 1994 measured sediment expressed in percentage of total sediment of 78,171 acre-feet at elevation 4725.0.

(10) Depth of reservoir expressed in percentage of total depth (137 if).

From 1964 survey results

14
Table 3. - State plane coordinates (page 1 of 2)

Big Horn 960,448,065 654,659(877

R- IL I.)8)2.498.051 65(165 849 4766,38

R- lB I.(8)l,664.534( 653397)56 48(17.76

R-2L 996,735.52)) 650071)206 481)491

R-2R 997.1)68,213 654(139,5 7 4904.87

R.3L 989.436.939 645.660.609 4805.39

R-3R 991)1)42.132 659)89.3)) 4760)6

R.4LJR-20L 983.195.4541 643.5)5.657 4754.92

R-4R 982.590(144 660,944.399 4759)2

R-5L 976865.175 647.7(15.165 4765.56

R5R/R-30R 977,904(193 661.181.4(54 4778.83

R-6L 967.899.358 847.824.402 4949.41)

R.6RJR-30L 966577.199 657,357.533 4780.28

R-7LJR-40L 960,874.82) 6425)5.138 4758.96

R-7RJR-50R 960,335.172 657.862.7)9 4764,89

R8L 951,955.594 647,446,563 4784,88

R-8RJR-50L 952.168,215 654.475.6)7 4881.29

R9L 641.722,248 646.728.752 4756.7)

R.9R 941,871.175 655,466,39) 4785(19

R-IOL 934,276.73) 648.742.654) 4751,4)

R- 1)4)4 954,144.117 654(131(225 4782.37

R-I IL 926.2)0.2)0 646,831.329 4782.79

R-l IR 927,2)8,466 652,831.962 4759.48

B. 12L 92)4(17,2077 647,(178,15(( 4761.23

R-(2R 920,682,482 656,221.798 4796(8)

R-13L 915,283.115 648,423,844) 466738)

R-13R 914,896,883 654.688.289 4773,32

R-14L 909,465.273 645,633,926 4798,63

R.I4R 94)9.877.651 . 6541)22.87) 4755,19

R(5L 903,948.444 646,902.636 4793.95

B. I SR 902,868,419) 651.424.531) 4747,68

R.16L 898.058.392 645550,245 4769,66

R-16R '897.271.163 650(8)3.779 4784.95

R-I6AL 895.370(89) 646,246.8)4)) 4769,66

B. I 7L 897,157.18)1 643,582.42)) 4773,13

RI7R 896515.569 643.621(738 4766,24

R-20R 975.8)8)723 645.731.232 4775.32

R-21L 987,239,303 637.374.26) 4770.47

R-21R 975.037.956 638.998,447 4755.98

R-22L 97936)4,860 63)390.426 4771.12

R-22R 976.179,971 632.239.189) 4753,78

R.23L 981.9)3.) II) 625,794.83) 4790.92

R-21R 979,3)7.654 626.268.741 4791)74

15
Table 3. - State plane coordinates ( page 2 of 2).

Range North East Elevatrnn

R-24L 980,252814 621,464348 480929

R-24R 978,051412 621,451574 481492

R-31L 975,524.307 664,462.457 4801.60

R-31R 975,524.307 664,462.457 477574

R-32L 969,703.289 666,301987

R-32R 4764.93

R-40L 960,874.821 642,515.138

R-40R 954,201.938 645,240109

R-41L 956,411.324 639,942764 4750.86

R-4 1R 951,497.915 640,800.866 4766.21

R-42L 956,424.244 635,893.915 4767.65

R.-42R 954,352.848 636,260.486 4761.22

R-43L 955,315.031 631,199362

R-43R 954,143.276 631,612.573 4758.46

R-44L 954,479.926 628,217.615

R-44R 952,738.013 629,090.750 4773.79

R-51L 951,583.800 661,902.785 4766.29

R-51R 954,307.503 662,967.398 4766.29

R-52L 949,976.703 665,197.252 4766.11

R-53L 949,368.109 669,235.066 4785.52

R-54L 950,433.939 672,476.968 4804.93

R-54R 952,117.695 671,738.345 4819.08

R-60L 940,112.768 656,010.064 4743.14

R-60R 4785.06

R-61L 940,371.000 658,631.858 4778.43

R-61R 941,489.308 659,667.137 4766.29

R-62L 938,135,511 660,530.086 4811.17

R-62R 939,109.061 661,678.859 4781.46

R-63L 936,442.292 662,920.267 4757.43

R-63R 936,952.551 663,409.032 4754.99

R-70L 937,952.687 648,150.024

R-70R 934,276.730 648,742.650 4757.41

R-71L 935,224.945 642,863.509

R-71R 934,037.284 644,144.437 4768.2

R-72L 932,476.689 641,516.087

R-SOL 905,497.525 651,567.359

R-80R 906,499.174 652,287.412

R-81L 904,161.148 654,637.825

R-81R 905,439.292 655,352.556

16
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Figure 1. Boysen Reservoir location map.

17
Space intentionally left blank due to security concerns 
Figure 3. - Boysen Reservoir survey data.

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Match to Map 285-D-1363 BOISE/i RES&?VOI8

plw#Ngr________ TE0W/4L APPhVVAL

0%'E 8Y ___

o

Dellnir, Co/oiido S[P /2 /9% 285-D--/J62

Fioure 4. - Bovsen Reservoir tooooraohic mao. No. 285-D-1362. 2.1
w E

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0 IV 20V 30V

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I Match to Map 285-O-134

801$[NA'Es[A'vO/g

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Fiqure 5. - Bovsen Reservoir tononrnhi mn Mr 9ORfl1

Match to Map 285-0-1362

N
Fiaiir 1 - R-v'n Pr,,-fr t-&,.,- KI, 'o r
w

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Figure 7. - Boysen Reservoir topographic map, No. 285-D-1365. 27
I Match to Map 285-11-1365 N

4

W4E

) _________________

+0/1 ///9))

920 00+

c/

_/I 0 f000 2000 J000

900000

(

910000+ 910000

00/000000

0

'vvi',/T

900O00

80151/I A'[SERVO/R

raa.cr

1W4$W 8T T[cIw/c041 O(PPROVAL____

_____- ______

20010000,

____________________________________ ____________

0,rer, Colorado 28lJd6

Fioure 8. - Bovsen Reservoir tonnnrnhie mn N 2R5-D-1366. '-"-9
32000

4755

4735

4715

4695

4675

4655

4635

BOYSEN RESERVOIR AREA - CAPACITY CURVES

Area (acre)

28000 24000 20000 16000 12000 8000 4000 0

4615

0

_____ ______ ______

94 Suey

:'

Original Suey

200000 400000

1 t

4755

4735

4715

4695

4675

4655

4635

4615

600000 800000 1000000 1200000 1400000 1600000

Capacity (acre-feet)

Figure 9. - 1994 area and capacity curves.
Badwater Creek

4740

4730

4720

4710

4-

0,

0)

U4700

w CA

4690

4680

4670

4660

18000 16000 14000 12000 10000 8000 6000

Distance Above Confluence (Feet)

Figure 10. - Longitudinal profile-Badwater Creek.

&'

SS.SSS

S

_______________ -

S

S

-

____

'N S .'S' -_

-0-- 1951 Pi1I1 "1]

-

-' 'S.'

-

- 1964 Prof He _____ __________ __________

-

- - - -1994 P9j • -'

4000 2000 0
4740

4730

4720

4710

4700

4690

C,

4680

i 4670

4660

4650

4640

4630

4620

-, 0

Cottonwood Creek

t

ci

_ ____________

lIIj j!!l I

35000 30000 25000 20000 15000 10000 5000 0

Distance Above Confluence (Feet)

Figure 11. -Longitudinal profile-Cottonwood Creek.
Five MileCreek

4730

4720

a)

a,

U0

>

a,

4710

4700

4690

4680

10000

-'

- '---.iI - - - - - - -

- - - - - S

N

-O--1951 Profile]

N NSNH

N

1964 Profile]

_________ - -

- - 1994 Profile N

9000 8000 7000 6000 5000 4000 3000 2000 1000 0

Distance Above Confluence (Feet)

Figure 12. - Longitudinal profile-Five Mile Creek.
4750

4740

4730

4720

4710

C

0

4-

4700

ill

4690

4680

4670

4660

18000

Muddy Creek

< :

-

'' '

16000 14000 12000 10000 8000 6000 4000 2000 0

Distance Above Confluence (Feet)

Figure 13. -Longitudinal prolile-Muddy Creek.
Poison Creek

4750

4740

4730

4720

4710

4700

4690

4680

14000

4

__

:i±1::H

12000 10000 8000 6000 4000

Distance Above Confluence (Feet)

2000 0

Figure 14. - Longitudinal profile-Poison Creek.
4740

4730

4720

4710

4700

4-

U4690

4680

4670

4660

4650

4640

14000

Tuff Creek

__ __ ____ _

1951 Profile

1964 Profile

_______ --1994 Profile ________ ____________ _____

12000 10000 8000 6000 4000 2000

DIstance Above Confluence (Feet)

0

Figure 15. -Longitudinal profile-luff Creek.
4740

4720

4700

4-. a 4680

L

C

0

4-

4660

4640

4620

4600

100000 90000 80000 70000 60000 50000 40000

Distance Above Confluence (Feet)

Figure 14. - Longitudinal profile-Wind River.

Wind River

S

00 55

30000 20000 10000 0
Mission

The mission of the Bureau of Reclamation is to manage, develop, and

protect water and related resources in an environmentally and

economically sound manner in the interest of the American Public.