UNITED STATES DEPARTMENT OF THE INTERIOR Douglas McKay, Secretary //. i • BUREAU OF RECLAMATION Wilbur A. Dexheimer, Commissioner TECHNICAL RECORD OF DESIGN AND CONSTRUCTION O'SULLIVAN DAM Constructed 1947-1949 Columbia Basin Project Denver, Colorado s Ml p •^g Columbia Basin Project General Information Purpose: Irrigation and catchment basin for return flow and waste water from irri- Wash. Water supply: Lower Crab Creek - at certain times of year fed completely by re- 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) Dam 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 Slopes: Upstream, 4 to 1 to elevation 960, 3 to 1 to elevation 1047. 5, then 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 Outlet conduit: 7 feet 6 inches in diameter, 725 feet long Outlet works stilling basin: unlined - excavated in rock Concrete: 2, 085 cubic yards Reinforcement steel: 97, 775 pounds CONTENTS 2. Grand Coulee Dam and the power and pumping plants 1 4. O1 Sullivan Dam and Potholes reservoir 5 CHAPTER H--INVESTIGATIONS 10. Materials investigations 9 14. Hydrologic requirements 17 CHAPTER IV--CONTRACT ADMINISTRATION 21. Specifications and contracts 27 23. Order for changes and extra work orders 27 24. Government and contractor's camps 29 |