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Key facts: Grand Coulee

Type of dam Concrete gravity
Location Columbia river, Washington state
Dates of construction 1933-41, 1967-74 – third power plant
Total length of dam(axis) 1592m
Length of main dam 1178m
Length of forebay dam 357m
Length of wing dam 57m
Height 167m
Spillway width 503m
Total concrete content 9.2Mm3
Total rock excavation 5.4Mm3
Max concrete pour (1 month) 410,080m3
Area 33,306ha
Length 243km
Total capacity 11,577m3 x 106
Maximum elevation (asl) 393m