Dam Construction Details
The dam is built of rolled earthfill material. Maximum height of the dam is 121 feet (37 m) above the stream bed. The total length of the dam is 4,600 feet (1,400 m), including a 1,600 feet (490 m)-long concrete section. The spillway in the concrete section is 856 feet (261 m) wide. The non-overflow part of the concrete section includes a power intake structure. State Highway 151 crosses the dam, connecting State Highway 51 on the south with U.S. Highway 64 on the north.
The spillway is a gated ogee weir, 720 feet (220 m) wide with eighteen tainter gates, each 40 feet (12 m) by 35 feet (11 m). Spillway capacity at the maximum pool level (elevation 766.0 feet (233.5 m)} is 939,000 cubic feet (26,600 m3)} per second. Capacity at the top of the flood control pool level (elevation 754.0 feet (229.8 m)) is 565,000 cubic feet (16,000 m3) per second. The spillway also has nine sluices, each 5.67 feet (1.73 m) by 10 feet (3.0 m).
The power intake structure is between the spillway and the left non-overflow section of the dam. It includes two penstocks, each 27 feet (8.2 m) diameter and controlled by two 14 feet (4.3 m) by 30 feet (9.1 m) gates. The power generation facility includes two hydroelectric generators, each rated at 35,000 kW.
In September and October or 1987, Keystone Lake was filled to capacity, requiring the Corps of Engineers to release water downstream at a rate of 310,000 cubic feet (8,800 m3) per second, which made downstream flooding inevitable. As a result, a private levee in Tulsa failed, causing more than $1.3 million in damages.
Read more about this topic: Keystone Lake
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