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The earthen dam was completed by the United States Bureau of Reclamation in May 1950, impounding the Heart River. [2] The dam has a structural height of 65 feet (20 m) and is 2,275 feet (693 m) along its crest. The dam was expanded in 1981, and an auxiliary spillway with bascule gates added.
The stone from the Great Oolite Group (Forest Marble, Bath Oolite, Twinhoe Beds and Combe Down Oolite), used for building purposes, formed over 146 million years ago when the area was underneath a deep tropical sea on which ooliths were deposited.
The Bureau of Reclamation details the geology of the reservoir area: The reservoir area is a gently rolling plain with a surface blanket of glacial till over-lying thin-bedded, highly jointed Pierre Shale. In this plain the James River has cut a valley 1,000 to 4,000 feet wide and 50 to 100 feet deep, which forms the reservoir.
United States Bureau of Reclamation: Dam and spillways; Type of dam: Embankment earth fill: Impounds: Heart River: Height: 142 feet (43 m) Length: 1,850 feet (560 m) Dam volume: 1,140,000 cubic yards (870,000 m 3) Spillways: 1 Morning-glory type: Spillway capacity: 5,700 cfs at 1,644.4 feet msl pool elevation: Reservoir; Creates: Lake Tschida ...
Following is a list of dams and reservoirs in North Dakota.. All major dams are linked below. The National Inventory of Dams defines any "major dam" as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m 3), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m 3).
The county has a total area of 1,666 square miles (4,310 km 2), of which 1,659 square miles (4,300 km 2) is land and 6.8 square miles (18 km 2) (0.4%) is water. [8] Lake Tschida, a Bureau of Reclamation reservoir and recreation area on the Heart River, is the county's largest body of water. [9]
The Reclamation Service elected to construct a new rail line on the old wagon road leading north to Idaho City. The railroad would begin at the Barberton mill near the Diversion Dam and extend to through a winding canyon up to Arrowrock. Even before the dam had been approved, Reclamation began work on the rail line.
United States Bureau of Reclamation: Operator(s) Eden Valley Irrigation and Drainage District: Dam and spillways; Type of dam: Earth fill dam: Impounds: Big Sandy River: Height (foundation) 85 feet (26 m) Elevation at crest: 6,769 feet (2,063 m) Dam volume: 840,000 cubic yards (640,000 m 3) Spillway capacity: 7,350 cubic feet per second (208 m ...