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Yellowtail Dam information


Yellowtail Dam
View of the dam face looking upstream
Yellowtail Dam is located in Montana
Yellowtail Dam
Location of the Yellowtail Dam in Montana
CountryUnited States
LocationBig Horn County, Montana
Coordinates45°18′24″N 107°57′29″W / 45.30667°N 107.95806°W / 45.30667; -107.95806
Construction began1961
Opening date1967
Construction cost$110 million
Owner(s)U.S. Bureau of Reclamation
Dam and spillways
Type of damConcrete arch-gravity
ImpoundsBighorn River
Height525 ft (160 m)
Length1,480 ft (450 m)
Width (crest)22 ft (6.7 m)
Width (base)147 ft (45 m)
Dam volume1,545,664 cu yd (1,181,745 m3)
Spillways1 main + outlet works
Spillway typeConcrete tunnel, 2x radial gates
Spillway capacity92,000 cu ft/s (2,600 m3/s)
Reservoir
CreatesBighorn Lake
Total capacity1,381,189 acre⋅ft (1.703672 km3)
Catchment area19,600 sq mi (51,000 km2)
Surface area17,300 acres (7,000 ha)
Power Station
Hydraulic head495 ft (151 m)
Turbines4x 62.5MW Francis
Installed capacity250 MW
Annual generation510,564,280 KWh

Yellowtail Dam is a dam across the Bighorn River in south central Montana in the United States. The mid-1960s era concrete arch dam serves to regulate the flow of the Bighorn for irrigation purposes and to generate hydroelectric power. The dam and its reservoir, Bighorn Lake, are owned by the U.S. Bureau of Reclamation.

The project was the result of negotiations between the federal government and the Crow Nation, the tribe of Native Americans that lived on the surrounding Crow Indian Reservation, and was originally envisioned as a shared facility that would provide profits for both sides. Eventually, the land was sold to Reclamation, although much of the reservoir, which extends 72 miles (116 km) upstream into Wyoming, lies in the reservation. The dam was authorized in 1944 and groundbreaking was in 1961; it was completed in 1967 after six years of construction. Today aside from its original purposes the dam serves for recreation both above and below the structure. Regulation of the Bighorn provided by the Yellowtail Dam has transformed the lower river into one of Montana's premier trout streams. However, there has been significant controversy surrounding the allocation of water in the reservoir between Montana and Wyoming, and the ecological damage wrought on 184 miles (296 km) of river both above and below the dam.

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