Page images
PDF
EPUB

UNITED STATES

DEPARTMENT OF THE INTERIOR
Douglas McKay, Secretary

BUREAU OF RECLAMATION

Wilbur A. Dexheimer, Commissioner

L. N. McClellan, Assistant Commissioner and Chief Engineer

TECHNICAL RECORD

OF

DESIGN AND CONSTRUCTION

O'SULLIVAN DAM

Constructed 1947-1949

Columbia Basin Project

Denver, Colorado

1954

Engl. Library TC 558

.07

08

458

General Information

Dam

O'SULLIVAN DAM
Columbia Basin Project

Purpose: Irrigation and catchment basin for return flow and waste water from irri-
gated lands in drainage area.

Location: On lower Crab Creek, about 22 miles south and 12 miles east of Ephrata,
Wash.

Constructed: 1947-1949

Water supply: Lower Crab Creek at certain times of year fed completely by return flow and waste water from irrigated lands in drainage area. Drainage area: 4,000 square miles

Maximum flood: 3,000 cubic feet per second (1943)

Reservoir:

Area: 32,000 acres

Total storage: 675,000 acre-feet at elevation 1052.0 (spillway crest)
Irrigation storage: 569, 000 acre-feet above Potholes East canal
headworks gate sill (EL. 1008.0)

Maximum water surface: El. 1055.0

Minimum water surface: El. 940.0

Type: Zoned rolled-earth fill

Foundation: Basalt, varying from dense to crushed and sheared types
Slope protection: Layer of rock on upstream and downstream slopes
Dimensions:

Height: 160 feet above streambed, 225 feet above excavation at deepest point
Crest length: 19, 000 feet

Crest elevation: 1061.0

Volume: 8, 770, 000 cubic yards

Slopes: Upstream, 4 to 1 to elevation 960, 3 to 1 to elevation 1047.5, then 2-1/2 to 1 to elevation 1061

Downstream, 2 to 1 to elevation 930, 4 to 1 to elevation 960, then 2 to 1 to elevation 1061

Cutoff trench: 15-foot bottom width from elevation 1060 to elevation 1045; from elevation 1045 to elevation 1010 the trench was widened 1 foot for each foot the bottom of the trench was below elevation 1045 and from elevation 1010 down the width remained 50 feet; side slopes of trench 1-1/2 to 1

Spillway and Outlet Works

Type of spillway: Overflow open channel, concrete crest width, 500 feet
Spillway crest: Elevation 1052.0

Maximum discharge: Spillway, 7,500 cubic feet per second at maximum water

surface

Outlets: 4- by 4-foot gate, 1, 150 cubic feet per second; 18inch gate, 67 cubic feet per second

[ocr errors][merged small]
[graphic][merged small]
[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small]
« PreviousContinue »