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Cold Springs Dam |
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Power Generation Narration
Geology A few large exposures of basaltic lave bedrock (Columbia River basalt) can be seen on the valley sides downstream from the dam; alluvium and/or windblown silt cover hut throughout most of the area bedrock. The alluvium appears to be chiefly sand, but beds of gravel and numerous cobbles and boulders can be seen at various places. The alluvium is thick, widespread deposit from a tremendous flood, which covered the area in late glacial times. In the spillway area bedrock is exposed only near the downstream end of the chute along the left wall. In this exposure the basalt is rather soft, crumbly and closely jointed. It is not highly resistant to erosion. Small exposures of basalt can be found at several places in the right hillside between the creek and spillway, but no rock was recognized on the right side of the spillway except at the downstream end. In a cliff along the right canyon wall about 300 feet left (east) of the spillway a considerable thickness of hard, fresh highly resistant basalt also occurs. Links | Recreation | | Dams Located by State | USBR Oregon Dams | Pacific Northwest Region Dams | | Owner: Bureau of Reclamation, Upper Columbia Area Office, | Operator: Hermiston Irrigation District, | Top |
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