Canyon Ferry Dam is a concrete gravity dam in a narrow valley of the Missouri River, United States, where the Big Belt Mountains and the Spokane Hills merge, approximately 68 miles (109 km) downstream from the confluence of the Gallatin, Madison, and Jefferson rivers, and about 20 miles (32 km) east of the city of Helena, Montana. The dam is for flood control, irrigation, recreation and hydroelectric power. The building of the dam created a reservoir known as Canyon Ferry Lake.
In 1941, the first study for the dam was carried out by the Bureau of Reclamation, the Montana Water Board and Montana Power Company. The dam and power plant were part of the Pick-Sloan Plan and approved by the Flood Control Act of 1944 which was signed on December 22. Known as the Canyon Ferry Unit, construction began on May 24, 1949, and was completed on June 23, 1954. On December 18, 1953, the power plant's first generator became operational and the other two went online in 1954.[2]
The 1949 structure replaced the original Canyon Ferry Dam 1.5 mi (2 km) upstream. The original dam was constructed between 1896 and 1898 by the Helena Water and Electric Power Company. It was a timber crib dam with rock-fill and was 29 ft (9 m) high and 485 ft (148 m) long.[3]
Designedit
Dam from lake side
The dam is a 225 ft (69 m) tall concrete gravity type and has a length of 1,000 ft (305 m). The crest of the dam is 20 ft (6 m) while the base is 173 ft (53 m). The dam structure compromises a total of 414,400 cu yd (316,832 m3) of concrete. The dam's spillway is located on its central portion and is controlled by four radial gates. It has a maximum discharge of 150,000 cu ft/s (4,248 m3/s). Adjacent to the spillway is the dam's power plant which contains three 16.5 MWFrancis turbine generators for an installed capacity of 50 MW. Each turbine is fed with water by a 13.5 ft (4 m) diameter penstock. At a normal elevation of 3,797 ft (1,157 m), the reservoir contains 1,891,000 acre⋅ft (2.332514155×109 m3) of water.[2]
Referencesedit
^"Canyon Ferry Dam". U.S. Bureau of Reclamation. Retrieved 2018-04-26.
^ ab"Canyon Ferry Unit". U.S. Bureau of Reclamation. Retrieved 25 March 2017.
^Wegmann, Edward (1918). The design and construction of dams (6 ed.). University of Michigan: John Wiley & Sons, inc. pp. 293. Canyon Ferry Dam.
Wikimedia Commons has media related to Canyon Ferry Dam.
U.S. Reclamation website: Canyon Ferry Unit
Helena History website
January 01, 1970
canyon, ferry, concrete, gravity, narrow, valley, missouri, river, united, states, where, belt, mountains, spokane, hills, merge, approximately, miles, downstream, from, confluence, gallatin, madison, jefferson, rivers, about, miles, east, city, helena, montan. Canyon Ferry Dam is a concrete gravity dam in a narrow valley of the Missouri River United States where the Big Belt Mountains and the Spokane Hills merge approximately 68 miles 109 km downstream from the confluence of the Gallatin Madison and Jefferson rivers and about 20 miles 32 km east of the city of Helena Montana The dam is for flood control irrigation recreation and hydroelectric power The building of the dam created a reservoir known as Canyon Ferry Lake Canyon Ferry DamLocation of the dam in Montana USACountryUnited StatesLocationLewis and Clark County Montana USACoordinates46 38 54 N 111 43 39 W 46 64833 N 111 72750 W 46 64833 111 72750StatusOperationalConstruction beganMay 24 1949Opening dateJune 23 1954Owner s U S Bureau of ReclamationDam and spillwaysType of damGravityImpoundsMissouri RiverHeight225 ft 69 m Length1 000 ft 305 m Width crest 20 ft 6 m Width base 173 ft 53 m Dam volume414 400 cu yd 316 832 m3 Spillway typeService four controlled gatesSpillway capacity150 000 cu ft s 4 248 m3 s ReservoirCreatesCanyon Ferry LakeTotal capacity1 997 900 acre ft 2 4644 km3 Normal elevation3 797 ft 1 157 m Commission date1953 1954Turbines3 x 16 5 MW Francis typeInstalled capacity50 MWAnnual generation277 052 777 KWh 1 Contents 1 Background 2 Design 3 References 4 External linksBackground edit nbsp Canyon Ferry and other dams built in the Pick Sloan Program In 1941 the first study for the dam was carried out by the Bureau of Reclamation the Montana Water Board and Montana Power Company The dam and power plant were part of the Pick Sloan Plan and approved by the Flood Control Act of 1944 which was signed on December 22 Known as the Canyon Ferry Unit construction began on May 24 1949 and was completed on June 23 1954 On December 18 1953 the power plant s first generator became operational and the other two went online in 1954 2 The 1949 structure replaced the original Canyon Ferry Dam 1 5 mi 2 km upstream The original dam was constructed between 1896 and 1898 by the Helena Water and Electric Power Company It was a timber crib dam with rock fill and was 29 ft 9 m high and 485 ft 148 m long 3 Design edit nbsp Dam from lake side The dam is a 225 ft 69 m tall concrete gravity type and has a length of 1 000 ft 305 m The crest of the dam is 20 ft 6 m while the base is 173 ft 53 m The dam structure compromises a total of 414 400 cu yd 316 832 m3 of concrete The dam s spillway is located on its central portion and is controlled by four radial gates It has a maximum discharge of 150 000 cu ft s 4 248 m3 s Adjacent to the spillway is the dam s power plant which contains three 16 5 MW Francis turbine generators for an installed capacity of 50 MW Each turbine is fed with water by a 13 5 ft 4 m diameter penstock At a normal elevation of 3 797 ft 1 157 m the reservoir contains 1 891 000 acre ft 2 332514155 109 m3 of water 2 References edit Canyon Ferry Dam U S Bureau of Reclamation Retrieved 2018 04 26 a b Canyon Ferry Unit U S Bureau of Reclamation Retrieved 25 March 2017 Wegmann Edward 1918 The design and construction of dams 6 ed University of Michigan John Wiley amp Sons inc pp 293 Canyon Ferry Dam External links edit nbsp Water portal nbsp Renewable energy portal nbsp Wikimedia Commons has media related to Canyon Ferry Dam U S Reclamation website Canyon Ferry Unit Canyon Ferry Dam and Visiting Center website Helena History website Retrieved from https en wikipedia org w index php title Canyon Ferry Dam amp oldid 1053727394, wikipedia, wiki, book, books, library,
