Overview
The Shadehill unit area occupies a more or less central position along the Grande River valley between the eastern and western extremities of the basin. The valley occupied by the Grande River varies in width from one-half mile to about one and three-fourths miles and is the physiographic stage of middle maturity. Oxbow lakes and sloughs meander scars and slip-off slopes are evident. Alluvial terraces are situated inside of meanders that occupy the valley width. Meander bends are actively engaged in lateral planation, eroding 50- to 150-foot-high sharp, precipitous valley walls. Bedrock exposed at Shadehill Damsite along the valley walls of the Grande River is the Upper member of the Hall Creek formation of Upper Cretaceous age. In places, the higher land of the immediate valley is only a cap of very thin alluvium deposited over bedrock. Numerous deposits of coarse sand and gravel exist through the terraces. The bottomland along the river is covered with deposits of alluvium consisting of silt, sand and gravel.
General
Project | PSMBP-Shadehill |
Longitude | -102.2033 |
Watercourse | Grand River |
Reservoir | Shadehill |
Original Construction | 1949-1951 |
National ID Number | SD01141 |
Latitude | 45.7533 |
Dimensions
Crest Elevation | 2318.00 ft |
Hydraulic Height (Normal Operating Depth at Dam) | 114.0 ft |
Crest Length | 12843.0 ft |
Top of Active Conservation Pool (Elevation) | 2260.00 ft |
Spillway Crest Elevation | 2272.00 ft |
Streambed at Dam Axis | 2220.00 ft |
Structural Height | 145.0 ft |
Top of Inactive Conservation Pool (Elevation) | 2253.40 ft |
Top of Dead Storage Pool (Elevation) | 2250.80 ft |
Hydraulics & Hydrology
Spillway Capacity at Elevation | 5700.0 cfs at 2312.0 ft |
Outlet Works Capacity at Elevation | 600.0 cfs at 2272.5 ft |
Normal Water Surface Elevation | 2312.0 ft |
Auxiliary Spillway | No |
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