NE01078 - Trenton Dam


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Trenton Dam


	Statistics

General

Region (Map) : .................. Great Plains

State (Map) ........................ Nebraska

County ................................ Hitchcock

Project: ............... PSMBP-Franchman-Cambridge

Dam type: ........................... Earthfill

Location: ............................ 2.5 mi Wof Trenton

Watercourse: ..................... Republican River

Reservoir: ........................... Swanson

Construction Date: ........... 1949-1953

National ID Number ......... NE01078

Hydrologic Unit Code ....

Dimensions

Crest Elevation of Dam: ................... 2,793.0 ft

Structural Height of Dam: ................. 144.0 ft

Crest Length: ................................... 8,600.0 ft

Top of Joint Use: ............................. 2,752.0 ft

Top of Active Conservation: ............ 2,752.0 ft

Top of Inactive Conservation: .......... 2,720.0 ft

Spillway Crest: ................................ 2,743.0 ft

Top of Dead Storage: ...................... 2,710.0 ft

Streambed at Dam Axis : ................. 2,693.0 ft

Hydraulics

Normal Water Surface Elev: .............. 2,752.0 ft

Hydraulic Height: .................................... 92.0 ft

Service Spillway Type:

Uncontrolled Crest ................................ No

Morning-Glory ........................................... No

Crest Length .......................................... NA

Gated .......................................................... Yes

Capacity at Elev: 2,785.0 ft, . 126,500 cfs

Auxiliary Spillway ......................................... No

Capacity at Elev. ................................... 0 cfs

Outlet Works Capacity at

Elevation 2773.0 ft., ....................... 4,300 cfs

Hydrology

Drainage Area: ................................ 8,620 sq mi

Hydrometeorological Report HMR 51 & 52

Flood Type: .................................. General Rain

Storm Duration: ........................................ 72 hrs

Probable Maximum Flood (PMF) Report:

Peak Inflow: ............................... 1,483,000 cfs

Inflow Volume: ..................... 1,433,000 acre-ft

Flow Duration: ...................................... 7 days

PMF Routing MWS Elev. ......................... NA

Initial Routing Elev: ................................. x.0 ft

Study Date: ................................ August, 1995

Power Generation

Power Generation at Dam Site - None

Bureau of Reclamation Power Program

Narration

Geology

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

Links

| Recreation |

| Dams Located by State | USBR Nebraska Dams | North Great Plains Region Dams |

| Owner: Bureau of Reclamation, Nebraska-Kansas Area Office,
PO Box 1607, Grand Island, NE 68802-1607, (308) 389-4622

| Operator: Bureau of Reclamation, Nebraska-Kansas Area Office,
PO Box 1607, Grand Island, NE 68802-1607, (308) 389-4622