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
Contact
Owner
Title: Area Office Manager Organization: Dakotas Area Office Address: PO Box 1017 City: Bismarck, ND 58501 Fax: 701-250-4326 Phone: 701-250-4242
Operator
Title: Area Office Manager Organization: Dakotas Area Office Address: PO Box 1017 City: Bismarck, ND 58501 Fax: 701-250-4326 Phone: 701-250-4242
More Information about the U.S. Bureau of Reclamation
