Tiber Dam

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Tiber Dam
Tiber Dam.jpg
Tiber Dam is located in Montana
Tiber Dam
Location of Tiber Dam in Montana
CountryUnited States
LocationChester, Montana
Coordinates48°19′19″N 111°05′52″W / 48.32194°N 111.09778°W / 48.32194; -111.09778Coordinates: 48°19′19″N 111°05′52″W / 48.32194°N 111.09778°W / 48.32194; -111.09778
Construction began1952
Opening date1956
Owner(s)U.S. Bureau of Reclamation
Dam and spillways
Type of damEmbankment, zoned earth-fill
Height211 ft (64 m)
Length4,300 ft (1,311 m)
Elevation at crest3,026 ft (922 m)
Width (crest)30 ft (9 m)
Width (base)2,500 ft (762 m)
Dam volume9,800,000 cu yd (7,492,638 m3)
Spillway capacityMain: 68,467 cu ft/s (1,939 m3/s)
Auxiliary: 5,845 cu ft/s (166 m3/s)
Total capacity1,515,000 acre⋅ft (1.868724984×109 m3)
Catchment area4,375 sq mi (11,331 km2)
Normal elevation2,933 ft (894 m)

Tiber Dam, located in southern Liberty County in northern Montana, USA, is a dam on the Marias River which forms Lake Elwell, also known as Tiber Reservoir. Construction on the dam began in 1952 and it was complete in 1956. Between 1967 and 1969, a dyke was added to the southern rim of the reservoir near the dam due to difficulties with the spillway settling. From 1976 to 1989, the spillway was rehabilitated.[1] The dam is also considered one of the biggest earth-fill dams in the world, along with Fort Peck Dam.[citation needed]

The dam is an earth-fill type with a length of 4,300 ft (1,311 m) and height of 211 ft (64 m). The dyke is 17,000 ft (5,182 m) long and 60 ft (18 m) tall. The dam's main spillway is controlled by three gates and has a maximum discharge of 68,467 cu ft/s (1,939 m3/s). The dam's auxiliary spillway can release up to 5,845 cu ft/s (166 m3/s) and the outlet works 1,605 cu ft/s (45 m3/s).[1]


  1. ^ a b "Tiber Dam". U.S. Bureau of Reclamation. Retrieved 19 June 2011.