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Kachess Dam |
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Statistics |
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Power Generation Narration
Geology A glacial till moraine extends across the entire Kachess River valley and comprises the foundation and abutments of the dam. The glacial till is composed of a heterogeneous mixture of clay, silt, sand, gravel, cobbles, and boulders. These materials were used as the borrow for construction of the impervious and pervious zones of the dam. Preconstruction investigations suggest the thickness of the moraine ranges from 45 to 60 feet between dam stations 8+00 and 13+20. From dam station 13+20 to the left end of the dam at station 14+00, the moraine thickens rapidly to about 100 feet. The thickness of the moraine between dam stations 0+00 and 8+00 probably ranges from about 80 to 100 feet, and possibly up to 200 feet, based on the site topography and depth of the reservoir. Site investigations during original construction showed the moraine in the foundation and borrow areas to be comprised. of lenses of fine materials (blue, brown, and gray clays), hardpan (fines, sand, gravel, and plus 3-inch material variably cemented with calcareous or iron-based agents), and various uncemented combinations and gradations of sand, gravel and plus 3-inch material. Miscellaneous Links | Current Reservoir Storage, plus other storage Units within the Yakima River Basin | Links | Recreation | | Dams Located by State | USBR Washington Dams | Pacific Northwest Region Dams | | Owner: Bureau of Reclamation, Upper Columbia Area Office, | Operator: Bureau of Reclamation, Upper Columbia Area Office, |
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