CO01685 - Jackson Gulch Dam


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Jackson Gulch Dam


	Statistics

General

Region (Map) : ................. Upper Colorado

State (Map) ........................ Colorado

County ................................ Montezuma

Project: .................................Mancos

Dam type:............................ Earthfll

Location: ............................ 5 mi N of Mancos

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

Reservoir: ........................... Jackson Gulch

Construction Date: ............1941-1950

National ID Number .......... CO01685

Hydrologic Unit Code .....

Dimensions

Crest Elevation of Dam: ...................... 7831.0 ft

Structural Height of Dam: ................... 180.0 ft

Crest Length: ........................................ 1900.0 ft

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

Top of Active Conservation: ............. 7825.0 ft

Top of Inactive Conservation: .......... NA

Spillway Crest: ..................................... NA

Top of Dead Storage: .......................... 7708.6 ft

Streambed at Dam Axis : ..................... 7671.0 ft

Hydraulics

Normal Water Surface Elev: ............ 7825.0 ft

Hydraulic Height: ................................160.0 ft

Service Spillway Type:

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

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

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

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

Capacity at Elev: NA ft, NA

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

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

Outlet Works Capacity at

Elevation 7825.0 ft., ..................... 280 cfs

Hydrology

Drainage Area: ................................. 1.44 sq mi

Hydrometeorological Report HMR 49

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

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

Probable Maximum Flood (PMF) Report:

Peak Inflow: ....................................... 9,630 cfs

Inflow Volume: .............................. 720 acre-ft

Flow Duration: ....................................... 10 hrs

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

Initial Routing Elev: .......................... 7825.0 ft

Study Date: ...................................... July 1985

Power Generation

Power Generation at Dam Site - None

Bureau of Reclamation Power Program

Narration

Geology

Below elevation 7790 on the left abutment and 7805 on the right abutment Jackson Gulch Dam will rest on a layer of wash composed of gravel, rock and clay-silt four to eleven feet thick, apparently quite impervious, overlying a sandy shale of varying degrees of hardness, and Dakota sandstone. Above these elevations one test pit near each end of the dam shows two to five feet of soil, compacted clay and a few boulders overlying 28 to 32 feet of gravel and boulders, which in turn rest on shale. Top soil and loam varies from 1 to 2.5 feet in depth. In the valley bottom the silt is stripped above the dam axis to the sandstone.

Links

| Recreation |

| Dams Located by State | USBR Colorado Dams | Upper Colorado Region Dams |

| Owner: Bureau of Reclamation, Western Colorado Area Office,
PO Box 60340, Grand Junction, CO 81506-0340, (970) 248-0690

| Operator: Mancos Water Conservancy District,
42888 County Road N, Mancos, CO 81328, (970) 533-7325