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Reservoir "A" Dam |
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Power Generation Narration
Geology Topography probably was the major factor influencing the selection of the site for Reservoir "A" Dam. The reservoir basin is a shallow, round-bottomed, erosional valley eroded into a gently undulating lava plateau by Lindsay Creek. Most of the surface of the plateau is covered with a clayey, silty soil, which is as much as 65 feet thick. The soil is thinnest in drainages where part of the soil cover has been removed by erosion. A few small outcrops of basalt are present on the plateau surface surrounding the reservoir basin and in some of the deeper drainages in the area. Clayey, silty soil with some fine sand constitutes most of the foundation and abutments of Reservoir "A" Dam. The soil was derived from weathering of basalt. It shows no evidence of stratification and is interpreted as a residual deposit. Near the right abutment of the dam, thick layers of silty clay, lime clay, silty sand and thin alternating layers of sandstone, clay, sand and boulders were penetrated by drilling. Stratification indicates this material has been transported and is interpreted as an alluvial deposit. Links | Recreation | | Dams Located by State | USBR Idaho Dams | Pacific Northwest Region Dams | | Owner: Bureau of Reclamation, Snake River Area Office - West, | Operator: Lewiston Orchards Irrigation District, |
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