Trenton Dam

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
RegionFacilities in Great Plains | Great Plains Home Page
StateNebraska
CountyHitchcock
ProjectPSMBP-Frenchman-Cambridge
Dam Type
ReservoirSwanson
WatercourseRepublican River
Location2.5 mi W of Trenton
Longitude-101.0600
Latitude40.1700
Original Construction1949-1953
Modified Construction
National ID NumberNE01078
Hydrologic Unit Code

Dimensions
Structural Height144.0 ft
Hydraulic Height (Normal Operating Depth at Dam)92.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation2743.0 ft
Crest Elevation2793.0 ft
Crest Length8600.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis2693.0 ft
Top of Exclusive Flood Control Pool (Elevation)
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
Top of Dead Storage Pool (Elevation)2710.0 ft

Hydraulics & Hydrology
Volume
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation2752.0 ft
Spillway Type
Auxiliary SpillwayNo
Spillway Capacity at Elevation126500 cfs at 2785.0 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation4300 cfs at 2773.0 ft
Diversion Capacity at Elevation
Drainage Area8620 sq mi
Hydrometeorological Report (HMR)HMR 51 & 52
Probable Maximum Flood (PMF) Report

Contact Information
Owner
TitleArea Office Manager
OrganizationNebraska-Kansas Area Office
Address1706 West Third
CityMcCook, NE 69001
Phone (Office)308-345-4400
Phone (Fax)308-345-6470
Operator
TitleArea Office Manager
OrganizationNebraska-Kansas Area Office
Address1706 West Third
CityMcCook, NE 69001
Phone (Office)308-345-4400
Phone (Fax)308-345-6470


Last updated: Apr 08, 2013