Tiber Dam

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Tiber Dam
Tiber Dam.jpg
USA Montana relief location map.jpg
Red pog.svg
Location of Tiber Dam in Montana
CountryUnited States
Location Chester, Montana
Coordinates 48°19′19″N111°05′52″W / 48.32194°N 111.09778°W / 48.32194; -111.09778 Coordinates: 48°19′19″N111°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 dam Embankment, 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 area 4,375 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 ]

Liberty County, Montana County in the United States

Liberty County is a county located in the U.S. state of Montana. As of the 2010 United States Census, the population was 2,339. Its county seat is Chester. The decision to separate the future Liberty County area from the previous Hill and Chouteau counties was carried in a 1919 vote; the organization was authorized to commence in the following February.

Montana State of the United States of America

Montana is a landlocked state in the Northwestern United States. Montana has several nicknames, although none are official, including "Big Sky Country" and "The Treasure State", and slogans that include "Land of the Shining Mountains" and more recently "The Last Best Place".

Dam A barrier that stops or restricts the flow of surface or underground streams

A dam is a barrier that stops or restricts the flow of water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC.

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]

Spillway structure for controlled release of flows from a dam or levee

A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure that the water does not overflow and damage or destroy the dam.

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  1. 1 2 "Tiber Dam". U.S. Bureau of Reclamation. Retrieved 19 June 2011.