Overview
The Republican River heads on the high plains of Colorado, crosses the corner of Kansas, and flows into southern Nebraska where Trenton Dam is located. Dense, impervious Cretaceous-age marine Ogallala sandstone, Pleistecene-age loess with two members separated by a soil horizon, the Sandborn Formation and overburden including dune sand, reworked loess and sandy alluvium are present at the damsite. The bottom of the cutoff trench, the spillway structure and the outlet tunnel together with its aperture structures are founded on shale. Loess compacted by ponding and rolling, underlain in turn by sandstone and then shale form the abutments. Sandy alluvium underlies the river section of the fill except in the bottom of the cutoff trench. This is a stable, impervious and satisfactory foundation
General
Project | PSMBP-Frenchman-Cambridge |
Location | 2.5 mi W of Trenton |
Longitude | -101.0600 |
Watercourse | Republican River |
Reservoir | Swanson |
Original Construction | 1949-1953 |
National ID Number | NE01078 |
Latitude | 40.1700 |
Dimensions
Crest Elevation | 2793.0 ft |
Structural Height | 144.0 ft |
Hydraulic Height (Normal Operating Depth at Dam) | 92.0 ft |
Crest Length | 8600.0 ft |
Top of Joint Use Pool (Elevation) | 2752.0 ft |
Top of Active Conservation Pool (Elevation) | 2752.0 ft |
Top of Inactive Conservation Pool (Elevation) | 2720.0 ft |
Spillway Crest Elevation | 2743.0 ft |
Top of Dead Storage Pool (Elevation) | 2710.0 ft |
Streambed at Dam Axis | 2693.0 ft |
Hydraulics & Hydrology
Normal Water Surface Elevation | 2752.0 ft |
Spillway Capacity at Elevation | 126500 cfs at 2785.0 ft |
Auxiliary Spillway | No |
Outlet Works Capacity at Elevation | 4300 cfs at 2773.0 ft |
Drainage Area | 8620 sq mi |
Hydrometeorological Report (HMR) | HMR 51 & 52 |
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