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FORT PECK DAM
Length 21,026 ft.
Height (above stream bed) 250.5 ft.
Elevation (top of dam above mean sea level) 2280.5 ft.
Width: Top 50 ft.
Base (maximum) 4,900 ft.
Earth Fill 125,628,288 cu. yds.
Gravel 3,910,140 cu. yds.
Rock (rip-rap) 882,582 cu. yds.
The Tunnels:
Number 4
Length from 5,386 to 7,262 ft.
Diameter 24 ft. 8 in.
The Spillway:
Number of Gates 16
Size of Gates 25 ft. high by 40 ft wide
Discharge (maximum) 250,000 cu. ft. per second.
Excavation 14,403,000 cu. yds.
Length of reinforced concrete discharge channel - one mile
The Reservoir: (at full pool)
Capacity 19,400,000 acre feet
Length 189 miles
Width (clear) 16 miles
Depth (from stream bed) 220 feet
The Power Plant:
Designed Capacity 165,000 KW
Installed Capacity 85,000 KW
Number of Generators Installed 3
Ultimate Number of Generators 5
(U.S. Bureau of Reclamation Statistics)
This major project on the Missouri in northeastern Montana was built by the Corps of Engineers, U.S. Army as a major link in the development of the Upper Missouri. It was first considered as early as 1890 when the chief of engineers published a survey made by the Missouri River Commission. After disastrous floods in the river basin, more extensive surveys were authorized in the Flood Control Act of 1928.
A more intensive investigation on the damsite was started June 27, 1933 including under-ground exploration, geological feasibility and topographical surveys of the reservoir area to determine its capacity, and laboratory testing to determine the suitability of soils for use in the construction of an earth-fill dam.
A report of the findings was made to Congress recommending construction of the dam. It was approved by President Franklin D. Roosevelt on October 14, 1933 under the Public Works Administration and actual construction started on October 24, 1953. Waters of the Missouri were diverted into the tunnels on June 24, 1937.
Construction of Fort Peck hydro-electric power plant was approved by Congress May 18, 1938. Power was first generated in 1943. A second generator was put in operation in 1948, a third began operation in 1951. Under the Federal act, the Department of the Army generates and the Bureau of Reclamation distributes and sells the power.
One of the great rivers of the North American continent, the Missouri is formed by the junction of the Jefferson, Madison and Gallatin rivers at Three Forks. It has a length of about 2,470 miles and a total fall of 3,630 feet.
Considered a dramatic example in construction history was the placing of 125,628,288 cubic yards of earth fill. Placed hydraulically with four electrically operated suction dredges, the units pumped the mixture of earth and water through twenty eight inch pipe lines to the dam.
The spillway, a masterpiece in design, is the safety valve of the dam, built to discharge 250,000 cubic feet per second. It is located about three miles from the dam in a natural flowage way in the rim of the reservoir.
A major benefit of Fort Peck dam is the recreational features provided along the shore line of the reservoir. On the shores are two state parks, one at Rock Creek thirty five miles south of he spillway and the other at Hell Creek, twenty six miles north of Jordan off Highway 18. Camping, picnicking and water sports are offered at each.
SOURCE: U.S. Army Engineer District, Fort Peck Dam Area, Fort Peck, Montana.
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