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
Contact
Owner
Title: Area Office Manager Organization: Nebraska-Kansas Area Office Address: 1706 West Third City: McCook, NE 69001 Fax: 308-345-6470 Phone: 308-345-4400
Operator
Title: Area Office Manager Organization: Nebraska-Kansas Area Office Address: 1706 West Third City: McCook, NE 69001 Fax: 308-345-6470 Phone: 308-345-4400
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