WY01380 - Keyhole Dam


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Keyhole Dam


	Statistics

General

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

State (Map) ........................ Wyoming

County ............................... Crook

Project: ............................... PSMBP-Keyhole

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

Location: ........................... 17 mi NE of Moorcroft

Watercourse: .................... Offstream

Reservoir: .......................... Keyhole

Construction Date: .......... 1950-1952

National ID Number ........ WY01380

Hydrologic Unit Code ....

Dimensions

Crest Elevation of Dam: ...................... 4134.0 ft

Structural Height of Dam: ................... 168.0 ft

Crest Length: .......................................... 3,420 ft

Top of Joint Use: .......................................... NA

Top of Active Conservation: ............. 4099.3 ft

Top of Inactive Conservation: ........... 4051.0 ft

Spillway Crest: ...................................... 4099.3 ft

Top of Dead Storage: .......................... 4036.0 ft

Streambed at Dam Axis : .............................. NA

Hydraulics

Normal Water Surface Elev: ............... 4128.7 ft

Hydraulic Height: ................................... 113.0 ft

Service Spillway Type:

Uncontrolled Crest .................................Yes

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

Crest Length ..................................... 19.25 ft

Gated ....................................................... No

Capacity at Elev: 4128.7 ft,.............10,850 cfs

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

Capacity at Elev. ..................................... NA

Outlet Works Capacity at

Elevation 4128.2,............................... 1,480 cfs

Hydrology

Drainage Area: ................................. sq mi

Hydrometeorological Report HMR x

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

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

Probable Maximum Flood (PMF) Report:

Peak Inflow: .................................. cfs

Inflow Volume: ........................ acre-ft

Flow Duration: ......................................0 days

PMF Routing MWS Elev.: ................. x.0 ft

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

Study Date:

Power Generation

Power Generation at Dam Site - None

Bureau of Reclamation Power Program

Narration

Geology

Three geologic units are exposed at Keyhole damsite:

1)Lakota sandstone which is soft to medium hard with considerable bedding and has a system of vertical joints that separates the bedrock into blocks or large masses. The lower portion of the Lakota sandstone across the valley floor.

2)Fuson shale lies above Lakota sandstone. It is dark-gray shale with sandy shale and sandstone zones.

3)Dakota sandstone (similar to Lakota) lies above the Fuson shale on both banks

Lakota sandstone forms the basal portion of both dam abutments with Fuson shale lying above the Lakota formation. Dakota sandstone lies high on the abutments above the Fuson shale. Dips of these strata are essentially horizontal at the damsite. Over burden near the dam axis consists of clay, silt, sand, and minor quantities of fine gravel.

Links

| Recreation |

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

| Owner: Bureau of Reclamation, Dakotas Area Office,
PO Box 1017, Bismarck, ND 58502-1017, (701) 250-4242

| Operator: Bureau of Reclamation, Dakotas Area Office,
PO Box 1017, Bismarck, ND 58502-1017, (701) 250-4242