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Palisades Dam |
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Statistics |
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Power Generation Narration
Geology Palisades Reservoirs covers about 16,000 acres on the floor of the Grand Valley, the northern portion of Lower Star Valley. The floor of the reservoir is a relatively flat plain underlain by a veneer of silt and fine sand and layers of sands and gravels. The total thickness of the overburden throughout the valley ranges from 5 to about 60 feet. The sand and gravel portion of the overburden is quite pervious. The overburden along the valley walls consists mostly of talus, which has accumulated along the base of the steeper slopes, and of outwash deposits from the side canyons. The talus deposits are accumulated rock debris and clayey silt soil, which appears to be semimpervious materials. The overburden on the main valley floor is underlain by a series of highly compact, uncemented, clays, silts sands and gravels. Surface exposures are found only at a few cuts along the riverbanks. In general the beds are rather lenticular, their strike is parallel with the north-southwest trend of the valley and are rather tight. The left wall is underlain by steeply inclined, consolidated sediments which are much older than the clay-silt beds. The right wall of the valley rises as a very steep slope from the dam upstream for about 500 feet, then as a cliff for several hundred feet to the rim of the valley Miscellaneous Links | Upper Snake River Basin Reservoir Storage (Tea Cup Diagram) | Links | Recreation | Palisades Reservoir - Boat Ramp Elevations | | Dams Located by State | USBR Idaho Dams | Pacific Northwest Region Dams | | Owner: Bureau of Reclamation, Snake River Area Office - East, 1359 Hansen Avenue, Burley, ID 83318-1821, (208) 678-0461 |
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