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Deer Flat Lower Dam |
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Power Generation Narration
Geology Deer Flat Reservoir (Lake Lowell) is an off stream storage site that was created by damming three low areas in a natural broad channel. The natural channel is probably an old drainage way or glacial flood channel. The dams and reservoir are located within a large alluvial filled basin, which is underlain by hundreds of meters on unconsolidated to slightly consolidated sediments. Most of the sediments are fluvial but some are lacustrine in origin. In some parts of the basin there are intercalated basaltic lava flows. The formation directly underlying the damsite is called the Caldwell-Nampa sediments of the Pleistocene age. This formation, which is up to 15m (50ft) thick, is described as unconsolidated layers and lenses of clay, silt, sand and gravel. Beneath the Caldwell-Nampa sediments, and outcropping in some places near the reservoir, is the Ten-Mile Gravel Formation which is described as up to 152m (500ft) of poorly consolidated silt, sand, gravel and cobbles. Overlying these sediments are scattered, recent thin deposits of sand, gravel and windblown silt. Other Dams or Dikes which enclose Lake Lowell -Deer Flat Dams consist of four earthen embankments at separate locations forming the offstream Lake Lowell Reservoir. 1) 2) Deer Flat Lower Dam 3) Deer Flat Middle Dam 4) Deer Flat East Dike Miscellaneous Links | Boise & Payette River Basins Storage | Links | Recreation | | Dams Located by State | USBR Idaho Dams | Pacific Northwest Region Dams | | Owner: Bureau of Reclamation, Snake River Area Office - West, | Operator: Boise Project Board of Control, | Top |
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