BUMPING LAKE

1990 Reservoir Survey

U.S. Department of the Interior

Bureau of Reclamation
7-2090 (4-81)

Bureau of Reclamafion TECHNICAL REPORT STANDARD TITLE PAGE

1. REPORT NO. [2. OVMFNT ACC S:OL. 3. RECIPIENTS CATALOG NO.

4. TITLE AND SUBTITLE 5. REPORT DATE

January 1992

Bumping Lake 6. PERFORMING ORGANIZATION CODE

1990 Reservoir Survey

D-5753

7. AUTHOR(S) 8. PERFORMING ORGANIZATION

REPORT NO.

Ronald L. Ferrari _____________________________

9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO.

Bureau of Reclamation 11. CONTRACT OR GRANT NO.

Denver Office

Denver CO 80225 13. TYPE OF REPORT AND PERIOD COVERED

12. SPONSORING AGENCY NAME AND ADDRESS

Same

14. SPONSORING AGENCY CODE

DIBR

15. SUPPLEMENTARY NOTES

Microfiche and hard copy available at the Denver Office, Denver, Colorado. Ed: TH

16. ABSTRACT

Bumping Lake was surveyed in 1990 to compile field data for developing a reservoir

topographic map and computing the present storage-elevation relationship. This was the first

survey to determine the natural lake capacity inundated due to construction of Bumping Lake

Dam. The original active capacity was based on topography collected prior to construction and

did not include areas below the natural lake's water surface. The 1990 bathymetric survey

utilized sonic depth recording equipment interfaced with an automated microwave positioning

system that gave continuous depth and sounding positions. The above-water reservoir area

was calculated from close interval cross sections measured from aerial photography flown in

1986. A new reservoir contour map was developed by the computer graphics program

SURFACE II using the collected data.

As of June 1990, at reservoir spiliway crest elevation (ft) 3426.2, the surface area was

1,382 acres with a total capacity of 61,359 acre-feet and an active capacity of 35,434 acre-feet.

17. KEY WORDS AND DOCUMENT ANALYSIS

a. DESCRIPTORS-- *reservOir area and capacity! *sedimentatiorj reservoir surveys! sonar!

contour area! reservoir area! reservoir survey

b. IDENTIFIERS- Bumping Lake

c. COSA TI Field/Group COWRR: SRIM:

18. DISTRIBUTION STATEMENT 19. SECURITY CLASS 21. NO. OF PAGES

(THIS REPORT) 16 A vailable from the National Technical Information Service Operations Division UNCLA$3/PIED

, ,

5285 Port Royal Road, Springfield, Virginia 22161. 20 SECURITY CLASS 22. PRICE

(THIS REPORT)

UN L45s,rfEr
BUMPING LAKE

1990 RESERVOIR SURVEY

by

RONALD L. FERRARI

BUREAU OF RECLAMATION

EARTH SCIENCES DIVISION

SURFACE WATER BRANCH

SEDIMENTATION SECTION

DENVER OFFICE

DENVER, COLORADO

January 1992
ACKNOWLEDGMENTS

The Bureau of Reclamation prepared and published this report under the

supervision of Robert I. Strand, Head, Sedimentation Section, Earth

Sciences Division. Ronald Ferrari and Steve Hughes of the Denver

Office conducted the hydrographic survey. Personnel from the

Columbia Basin Project Office of the Pacific Northwest Region assisted

during the hydrographic survey and performed the required land survey

for the hydrographic and aerial data collection. Personnel from the

Sacramento Office of the Mid-Pacific Region transcribed the aerial data

for computer processing. Special thanks to Doug Schmidt, Gerald

Schultz, and Tom Stevenson for the field and office help on the

hydrographic survey. Ronald Ferrari completed the data processing

needed to generate the new topographic map arid area-capacity tables.

Robert I. Strand, James 0. Blanton, Joseph K. Lyons, Curtis J. Orvis,

Timothy J. Randle, and Dave Zimmer consulted in the engineering

computations, topographic map development, and report preparation.

Mission: As the Nation's principal conservation agency, the Departxneht of the

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

and cultural resources. This includes fostering wise use of our land and water

resources, protecting our fish and wildlife, 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 assure that their development is in the best interests of all

our people. The Department also promotes the goals of the Take Pride in America

campaign by encouraging stewardship and citizen responsibility for the public lands

and promoting 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.
Bumping Lake Dam and Bumping Lake
CONTENTS

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Page

Introduction . 1

Summary and conclusions . 2

Description of watershed . 3

Reservoir operations 4

Survey method and equipment 4

Sediment analyses 5

Reservoir area and capacity 5

Development of 1990 contour areas 5

1990 storage capacity 6

Bibliography 7

TABLES

Table

1 Reservoir sediment data summary 9

FIGURES

Figure

1 Bumping Lake location map 1 F

2 Bumping Lake Darn, plan and sections 12

3 Bumping Lake topographic map 13

4 Map of basin outline 15

5 1990 area and capacity curves 16
INTRODUCTION

Bumping Lake Dam, one of six storage features of the Yakima Project, is located on the Bumping River in Yakima

County, Washington (fig. 1). The damsite is within the Snoqualmie National Forest, 2.2 miles southwest of Goose

Prairie, 19 miles west of Nile, and about 60 miles northwest of Yakima, Washington.

Construction of Bumping Lake Dam was authorized under the Tieton and Sunnyside Divisions of the Yakima Project

by the Secretary of the Interior on December 12, 1905. Construction of the dam began in 1909 and was completed

in 1910. Closure of the dam and first reservoir storage occurred on November 3, 1910.

Bumping Lake Dam is an earthfill structure constructed by hydraulic fill methods (fig. 2). At dam crest elevation

3,435.0 (ft) the embankment has a structural height of 61 feet, a hydraulic height of 38 feet, a crest width of 20 feet,

and a crest length of 2,925 feet. The reservoir impounded by the dam inundated a natural lake on the Bumping

River. The dam and reservoir provide storage for irrigation water, although the reservoir is operated to provide flood

control storage insofar as irrigation water supplies are not jeopardized. At elevation 3426.2 the reservoir extends

4.3 miles up the Bumping River and has a average width of 0.47 miles.

The spillway, an uncontrolled concrete weir with a concrete and wooden chute, is located at the left abutment. It

has a crest length of 235 feet and a crest elevation of 3426.2. In previous documents the spillway crest elevation

has been reported as 3426.0 feet. The design capacity of the spiiway is 3,760 ft3/s (cubic feet per second) at water

surface elevation 3429.0. The spillway discharges into a rock-lined stilling pool in the Bumping River.

The outlet works is in the left river channel and consists of:

• an intake gate tower structure

• a steel footbridge

• two emergency slide gates

• two service slide gates

• a circular concrete conduit through the embanlunent

• a concrete-lined trapezoidal outlet channel leading to a stilling basin in the Bumping River

The outlet discharge capacity was designed for 1,500 ft3/s (at water surface elevation 3426.2) but has been restricted

to the 800-ft3/s capacity of the lined outlet channel.
In 1910, Bumping Lake had a calculated active capacity of 33,700 acre-feet with a measured surface area of

1,303 acres at the reported spiliway crest elevation of 3426.0. The original capacity of the natural lake (dead

capacity) was unknown.

SUMMARY AND CONCLUSIONS

This report presents the 1990 results of the first extensive survey of Bumping Lake by the Bureau of Reclamation

since construction of Bumping Lake Dam. The primary objective of the 1990 survey was to gather necessary data

for computing the current total and active capacities of Bumping Lake. This was the first detailed survey to

determine the area and capacity of the natural lake inundated by the reservoir created by the dam.

Standard land surveying methods were used to establish horizontal and vertical control points for the aerial and

hydrographic surveys. A local horizontal grid system was established for both surveys using monumented control

points located on the dam. The bathymetric survey was run using sonic depth recording equipment interfaced with

an automated survey system consisting of a line-of-sight microwave positioning unit capable of determining sounding

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

survey boat was steered across close-spaced gridlines covering the reservoir area. The positioning system provided

information to allow the boat operator to maintain course along these gridjines. Water surface elevations measured

by the land surveyors at the time of data collection were used to convert the sonic depth measurements to true

reservoir bottom elevations.

The 1990 surface areas at predetermined 5-foot contour intervals were generated by a computer graphics program

that produced a new contour map of the reservoir (fig. 3). The ACAP85 computer program computed the reservoir

capacity and surface area at prescribed increments of elevations by using a curve-fitting technique from the generated

contour surface areas [1].*

The 1990 survey determined that the reservoir has a surface area of 1,382 acres at the spiliway crest elevation of

3426.2, providing a total capacity of 61,359 acre-feet, and an active capacity of 35,434 acre-feet. The survey

measured a reservoir dead storage of 25,925 acre-feet. In 1910, Bumping Lake had a calculated active capacity of

33,700 acre-feet with a measured surface area of 1,303 acres at the reported spiliway crest elevation of 3426.0. It

has since been determined that the spillway crest is at elevation 3426.2 feet. The active capacity lies between outlet

*

Numbers in brackets refer to bibliography.

2
works sill elevation 3389.0 and spilway sill elevation 3426.2. The 1990 survey calculated an active capacity of

35,434 acre-feet with a surface area of 1,382 acres at elevation 3426.2.

Several factors contributed to the increase in the 1990 measured area and resulting capacity. The original topography

of the reservoir area was developed from a plane table survey performed prior to clearing of dense timber and

construction of the darn. The heavily timbered area would have made it difficult to obtain an accurate survey, so

part of the surface area difference is probably due to the two different survey methods. Also, it is assumed that some

bank erosion occurred since construction of the reservoir, causing the eroded material on the steep south side of the

reservoir to settle in the natural lake area. This erosion can not be documented because this was the first survey of

the natural lake area.

Table 1 contains a comprehensive summary of the reservoir data and watershed characteristics for the 1990 survey.

A summary of reservoir sediment data was not presented because this was the first survey to compute the total

reservoir capacity.

Due to low sediment production in the drainage area, a resurvey of Bumping Lake should not be necessary unless

major sediment inflow occurs in the future.

DESCRIPTION OF WATERSHED

The drainage area of the Bumping Lake basin (above the dam) is 69.3 square miles (fig. 4). The western and

southern boundaries of the basin are formed by the Cascade Divide, the eastern boundary by the Nelson Ridge, and

the northern boundary by the American Ridge. The elevation of the basin ranges from elevation 3389.0 at the intake

gate tower of the darn to elevations in excess of 7500 feet at mountain peaks along the eastern divide. The minimum

elevation of the natural lake, which was inundated by the reservoir, was measured to be 3309.6 feet.

The watershed is characterized by high mountains with steep side slopes. The basin is heavily timbered and dotted

with numerous small natural lakes. The mountain peaks are mostly bare with rock outcrops. The main vegetative

cover throughout the basin is a dense growth of lodgepole pine with associated undergrowth of grass and brush.

Larch (tamarack) are interspersed among the lodgepole pines in the lower elevations with some Douglas fir and cedar

noted in the upper elevations. The soil mantle is thin with little plasticity. The soil is fairly porous; however, the

rock outcrop areas, the thin soil mantle, and the thick vegetation in the drainage area promote a low sediment

production.

3
Bedrock within the subbasin consists principally of low-permeability volcanic and metamorphic formations.

Unknown thicknesses of permeable sand and gravel deposits of Quatemary age underlie the valley. A glacial

moraine extends across the valley that impounded Bumping Lake. Some subsurface leakage from the reservoir

recharges the Quatemary sediments that underlie the valley downstream from the dam. The dam is situated in an

eroded canyon modified by alpine glaciation. The foundation of the dam, spiliway, and outlet works consists of

unconsolidated glacial deposits with lenses of Ime sediments. These saturated materials exceed 200 feet in depth.

RESERVOIR OPERATIONS

The reservoir is a multiuse facility having (following values are fmm June 1990 area-capacity tables):

• 3,957 acre-feet of exclusive flood control storage between elevations 3426.2 and 3429.0

• 35,434 acre-feet of active conservation storage between elevations 3389.0 and 3426.2

• 25,925 acre-feet of dead storage (natural lake) between elevations 3309.6 and 3389.0

Records for Bumping Lake show an average unregulated inflow of 210,450 acre-feet per year. The estimated mean

annual runoff from the basin is 56.9 inches. Bumping Lake operation ranged from a minimum elevation of

3390.8 feet in February 1949 to a maximum elevation of 3430.5 in June 1925. The monthly inflow and end-ofmonth stage records in table 1 show the extreme annual fluctuation of the reservoir.

SURVEY METHOD AND EQUIPMENT

The Bumping Lake survey was completed using the contour method as outlined by Blanton [211. The procedure

involved collecting adequate coordinate data for developing a reliable contour map by photogrammetric and

bathymetric survey methods. Standard land surveying methods were used by Columbia Basin Project Office

personnel to establish horizontal and vertical control points for both survey methods. A horizontal grid system was

established for both surveys using monumented points located on the dam. The above-water data was collected by

aerial photography in October 1986 with the water surface at elevation 3395.4. The field survey work for the

bathymetric survey involved establishing a triangulation network around the reservoir to provide horizontal and

vertical control for all required grid lines and shore stations. There were no previously established range lines on

the reservoir and it was decided not to establish permanent range lines during this survey. Because of the size and

shape of the reservoir, any future survey would also employ the contour method; therefore, permanent range line end

markers were not necessary.

4
The hydrographic survey took place June 6 through June 8, 1990, while the reservoir was spilling. The bathymetric

survey was run using sonic depth recording equipment interfaced with an automated survey system consisting of a

line-of-sight microwave positioning unit capable of detennining sounding locations within the reservoir. This

positioning system transmitted line-of-sight microwave signals to fixed shore stations and converted the reply time

to range distances, which were used by the system data logger to compute the coordinate position of the sounding

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

across close-spaced gridlines covering the reservoir area. To produce adequate data for developing contours of

Bumping Lake, a grid spacing of 300 feet was selected for the main body; 200-foot intervals were used near the dam.

The system gave directions to the boat operator to assist in maintaining course along the close-spaced gridlines.

During each run, the depth and position data were recorded on a floppy disk for subsequent processing by Denver

Office personnel. A graph plotter was used in the field to track the boat and determine adequate coverage during

the data collection process. Water surface elevations surveyed at the time of collection were used to convert the

sonic depth measurements to true reservoir bottom elevations.

SEDIMENT ANALYSES

The total sediment accumulation in Bumping Lake cannot be computed because this was the first survey of the

natural lake area (dead storage) since the dam was constructed. Because of the large reservoir dead storage measured

in 1990 and the low sediment production of the drainage area, a resurvey of Bumping Lake should not be necessary

unless major sediment inflow occurs in the future.

RESERVOIR AREA AND CAPACITY

Development of 1990 Contour Areas

The 1990 contour surface areas for Bumping Lake were developed by generating a contour map from the collected

1986 aerial and 1990 underwater coordinate data. Five-foot contour intervals of the reservoir area were created by

a computer graphics software program [3]. A modification of this program by the Denver Office calculated surface

areas of closed contours on the generated map. The final reservoir map shown on figure 3 was prepared by the

Denver Office Computer Drafting Unit of the Drafting Section. The map has a scale of 1 inch equals I ,000 feet and

5-foot contour intervals.

5
1990 Storage Capacity

The storage-elevation relationships based on the 1986 aerial data and the 1990 underwater survey data were

developed using the area-capacity computer program ACAP8S [1]. Surface areas at 5-foot contour intervals

computed from the 1986 aerial data and ihe 1990 underwater survey data were used as the control parameters for

computing reservoir capacity. The program computes an area at elevation increments of 0.01 to 1.0-foot by linear

interpolation between the 5-foot contour intervals. 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

Bumping Lake. Then the capacity equation is 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 the 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 fithng a certain region of data. Final area equations are derived by

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

y = a + a2x + a3x2

where:

y = capacity,

x = elevation above a reference base,

a = intercept, and

a2 and a3 = coefficients.

Results of the 1990 Bumping Lake area and capacity computations are listed in table 1 and plotted on figure 5. A

separate set of 1990 area and capacity tables has been published for the 0.01-, 0.1-, and 1-foot elevation increments

[4]. The 1990 total capacity is 61,359 acre-feet with a surface area of 1,382 acres at the spiliway crest elevation

3426.2.

6
BIBLIOGRAPHY

[11 A CAP85 User's Manual, Bureau of Reclamation, Surface Water Branch, Denver Office, Denver, Colorado, 1985.

[21 Blanton, James 0. III, Procedures for Monitoring Reservoir Sedimentation, Technical Guideline for Bureau of

Reclamation, Sedimentation Section, Denver Office, Denver, Colorado, October 1982.

3] Sampson, Robert J., Su,face Ii Graphics System, Kansas Geological Survey, Lawrence, Kansas, 1984.

[41 "Yakima Project Bumpmg Lake Washington Area and Capacity Tables," Bureau of Reclamation, Boise, Idaho,

June 1990.

7

RESERVOIR SEDIMENT

DATA SUMMARY Bumping Lake

NAME OF RESERVOIR

DATA SHEET NO.

5 1. OWNER Bureau of Reclamation 2. STREAM Bumping River 3. STATE Washington

A 4. SEC 14 T 16N R12E 5. NEAREST P0 Goose Prairie 6. COUNTY Yakima

N 7. LAT 4652'25" LONG l2117'57" 8. TOP OF DAM 3435.0 9. SPILLWAY CREST 3426.2

R 10. STORAGE 11. ELEVATION 12. ORIGINAL 13. ORIGINAL 14. GROSS STORAGE 15. DATE

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

BEGAN

a. FLOOD CONTROL 3429.0 1,366 4,000 37,700

R b. MULTIPLE USE 3426,01 1,303 33,700 33,700 Nov. 3,

1910

.

I

R

d. WATER SUPPLY 16. DATE

e

NORMAL

.

________________ _________________ _______________ _________________ OPERATION

f. CONSERVATION 3389.0 627 0 02 BEGAN

g. INACTIVE 11/3/10

17. LENGTH OF RESERvOIR 4.3 MILES AVG. WIDTH OF REn rRVOIR 0.47 MILES

T 18. TOTAL DRAINAGE AREA 69.3 SQ. MI. 22. MEAN ANNUAL PRECIPITATION 19.0 INCHES

19. NET SEDIMENT CONTRIBUTING AREA 69.3 SQ. MI. 23. MEAN ANNUAL RUNOFF 56.9 INCHES

I

N

20. LENGTH 10.5 MILES AV. WIDTH 6.6 MI 24. MEAN ANNUAL RUNOFF 210,450 ACRE-FEET

21. MAX. ELEV. 7585 MIN. ELEV. 3389 25. ANNUAL TEMP. MEAN 453 F RANGE -17 to 110 F

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, ACRES ACRE-FEET RATIO AF/AF

R YRS YEARS INTERVAL

V

E 11/03/1910 Contour(R)

Y

6/7/1990 79.6 79.6 Contour(D)' 5-ft 1 382 61 359 0.29 0

, ,

A

T 26. DATE OF 34. PERIOD 35. PERIOD WATER INFLOW, ACRE-FEET WATER INFLOW TO DATE, AT

A SURVEY ANNUAL

PRECIP.

a. MEAN ANN. b. MAX. ANN. c. TOTAL a. MEAN ANN. b. TOTAL

6/7/1990 19.0 210,450 326,900s 16,751,820 210,450 16,751,820

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

SURVEY

a. TOTAL b. AV. ANN. c. /MI.2-YR. a. TOTAL b. AV. ANNUAL c. /MI.2-YR.

6/7/1990

26. DATE OF 39. AV. DRY 40. SED. DEP. TONS/MI.2-YR. 41. STORAGE LOSS, POT. SED. INFLOW,

SURVEY NT. (LB/FT3)

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

DATE ANNUAL DATE PER. TOT.

6/ 7/ 1990

26.

DATE

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

OF

SURVEY

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN DEPTH DESIGNATION

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

DATE

SURVEY

0-10 10-

20

20-

30

30-

40

40-

50

50- 60-

60 70

70-

80

80-

90

90-

100

100- 105-

105 110

110-

115

115-

120

120-

125

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN REACH DESIGNATION

Table 1. - Reservoir sediment data summary (page 1 of 2).
45. RANGE IN RESERVOIR OPERATION

WATER YEAR MAX. ELEV. MIW. ELEV. INFLOW, AN WATER YEAR MAX. ELEV. MIN. ELEV. INFLOW, PS

1911 3426.4 3393.3 1951 3428.1 3393.7 291,700

1912 3426.8 3393.0 1952 3428.4 3393.3 187,900

1913 3427.4 3392.9 1953 3428.3 3392.9 209,900

1914 3427.2 3393.7 1954 3428.2 3393.2 259,400

1915 3428.2 3391.8 1955 3429.3 3394.6 197,200

1916 3427.4 3393.2 1956 3428.1 3394.0 326,900

1917 3427.6 3393,4 1957 3428.3 3395.3 209,200

1918 3429.0 3392.3 1958 3428.3 3397.5 192,000

1919 3429.5 3397.2 1959 3427.7 3397.1 255,400

1920 3430.3 3392.5 151,100 1960 3427.9 3396.6 230,600

1921 3430.4 3394.6 305,800 1961 3427.6 3394.6 250,100

1922 3430.1 3392.6 197,000 1962 3428.2 3396.0 186,100

1923 3429.7 3392.4 212,000 1963 3427.7 3393.4 179,770

1924 3430.2 3393.3 168,300 1964 3428.2 3392.8 210,580

1925 3430.5 3393.3 236,200 1965 3427.6 3395.7 217,710

1926 3430.2 3393.0 116,400 1966 3423.2 3393.7 156,620

1927 3429.5 3393.2 236,300 1967 3427.6 3392.9 207,790

1928 3429.9 3397.4 236,900 1968 3426.8 3394.1 226,040

1929 3430.3 3393.2 127,400 1969 3427.1 3393.2 213,370

1930 3429.9 3393.0 128,900 1970 3427.5 3395.1 176,030

1931 3428.7 3393.0 134,000 1971 3427.9 3393.2 257,340

1932 3429.6 3393.0 241,300 1972 3428.4 3395.1 308,290

1933 3428.4 3395.3 273,900 1973 3421.5 3393.0 140,490

1934 3429.3 3393.1 323,700 1974 3429.0 3393.0 319,420

1935 3427.9 3396.0 261,600 1975 3428.2 3393.1 238,580

1936 3428.1 3393.1 194,000 1976 3428.6 3396.5 282,540

1937 3428.0 3392.9 173,000 1977 3427.4 3395.4 92,100

1938 3428.1 3392.9 236,400 1978 3428.0 3397.1 218,500

1939 3427.6 3393.4 164,700 1979 3427.8 3394.4 135,700

1940 3427.4 3393.0 159,300 1980 3427.3 3394.0 196,000

1941 3422.4 3393.0 110,200 1981 3428.1 3395.6 203,900

1942 3427.5 3393.1 149,700 1982 3427.2 3394.9 248,700

1943 3427.9 3393.3 234,800 1983 3426.4 3397.1 225,800

1944 3427.2 3393.0 117,300 1984 3426.1 3393.5 217,250

1945 3427.7 3392.9 165,100 1985 3427.4 3395.0 161,640

1946 3427.9 3392.4 231,900 1986 3426.7 3395.2 184,590

1947 3427.8 3393.0 214,800 1987 3426.8 3393.9

1948 3428.5 3398.8 240,400 1988 3426,6 3394.1

1949 3428.3 3390.8 236,600 1989 3426.2 3395.0

1950 3428.1 3393.1 303,100 1990 3426.4 3398.9

46. ELEVATION - AREA - CAPACITY DATA FOR Original and 1990 ACTIVE CAPACITY'

ELEV. AREA CAP. ELEV. AREA CAP. ELEV. AREA CAP.

Original

3389

3395

3400

3405

3410

3415

Year-1910

627

664

725

825

950

1,070

0

3,900

7,309

11,200

15,600

20,700

3420

3426

3429

Yr 1990'°

3309,6

3389

3395

1,175

1,303

1,366

Active

0

591

656

26300

33,700

37,700

Capacity

0

0

3,734

3400

3405

3410

3415

3420

3426.2

3429

754

873

1,009

1,128

1,242

1,382

1,445

7,259

11,327

16,034

21,377

27,301

35,434

39,391

47. REMARKS AND REFERENCES

Originally reported as El. 3426.0 feet, corrected to El. 3426.2 feet.

Constructed reservoir inundated a natural lake. The original area-capacity of the natural lake was unknown.

Climatography of the United States, No. 81, and Climates of the United States, 1931-70, NOAA.

Calculated from mean annual runoff value 210,450 acre-feet, item 24.

Unregulated infow monthly records for water years 1920-1990, Water years 1987-1990 have missing records.

6 Project data book, USSR, 1981.

Original area-capacity of natural lake inundated by constructed reservoir was unknown. 1990 survey was first to

calculate natural lake's (dead storage) capacity.

Reservoir area was measured using data from bathymetric survey and aerial photography.

Total capacity of reservoir at spiliway crest elevation 3426.2. Active capacity of 35,434 acre-feet from

El. 3389.0 to El. 3426.2.

Following table shows active capacity. A dead capacity (natural lake> of 25,925 acre-feet was computed from 1990

data.

48, AGENCY MAKING SURVEY Bureau of Reclamation

49. AGENCY SUPPLYING DATA Bureau of Reclamation DATE August 1991

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

10
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Space intentionally left blank due to security concerns 
3 33 3 35 31 3000 4 5000 42 •3 4 0T 41 41 02 04000

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Cedar Creek \_

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r.nm,uJr OF THE 15(20 1020

-" OF 4E0000&OTFOH

TA/dMA P200./ECT - WASHmOTON

SCRIP INC LAKE

TOPOGRAPHY

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_ _ ____________

5 52000 53000 54000

-

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00*00.00000400 MA4V /4. 1101 443.. p.. 44

Figure 3. - Bumping Lake topographic map, drawing 443-D-44.

13
0

0

Rainier

Ohonapecosh

0

46° 55'

BUMPING LAKE DAM

'1

1

46° 45'

I0

z

z

4

Tieton Dam

BUMPING LAKE DAM

AKIMA PROJECT- WASHINGTON

BASIN OUTLINE

PLATE I

0 5 10

I i i i i I

SCALE OF MILES

Figure 4. - Basin outline-Bumping Lake Dam, Yakima project.

15

__•
AREA (100 ACRES)

3430

3420

3110

3400

3390

3380

3370

- D

3360

Li 3350

3310

C

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3300

l b 15 14 13 12 II 10 9 8 7 6 5 1 3 2 1

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ZCAPACI TY AR[ A

1

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1 N

LEGEND

1 1990 ACTIVE CAPACITY

__ __ __ __ - __ __ __ __ __

2'4 4 0 4 56 6'l 7'2 81

CAPACITY (1000 HCRE-rET)

Figure 5. - Area and capacity curves-Bumping Lake, 1990.