CO01697 - Vega Dam


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Vega Dam


	Statistics

General

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

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

County ............................... Mesa

Project: ............................... Collbran

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

Location: ........................... 10 mi E of Collbran

Watercourse: .................... Plateau

Reservoir: .......................... Vega

Construction Date: ........... 1957-1959

National ID Number ......... CO01697

Hydrologic Unit Code ....

Dimensions

Crest Elevation of Dam: .......................7997.0 ft

Structural Height of Dam: .................... 162.0 ft

Crest Length: .........................................2100.0 ft

Top of Joint Use: .................................. N/A

Top of Active Conservation: ............. 7984.0 ft

Top of Inactive Conservation: .......... N/A

Spillway Crest: ..................................... N/A

Top of Dead Storage: ......................... 7906.0 ft

Streambed at Dam Axis : .................... 7857.0 ft

Hydraulics

Normal Water Surface Elev: ................7984.0 ft

Hydraulic Height: .................................. 127.0 ft

Service Spillway Type:

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

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

Crest Length ........................................ xxx ft

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

Capacity at Elev: xxxx.0 ft, xxx,xxx cfs

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

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

Outlet Works Capacity at

Elevation xxxx.0 ft., .......................... xxxx cfs

Hydrology

Drainage Area: ................................. 24.4 sq mi

Hydrometeorological Report HMR 49

Flood Type: .........................May-June General

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

Probable Maximum Flood (PMF) Report:

Peak Inflow: ....................................... 4,060 cfs

Inflow Volume: .......................... 23,840 acre-ft

Flow Duration: .....................................15 days

PMF Routing MWS Elev.: ................7988.0 ft

Initial Routing Elev: .......................... 7984.0 ft

Study Date: ......................................May 1968

Power Generation

Power Generation at Dam Site - None

Bureau of Reclamation Power Program

Narration

Geology

Collbran Project is located along the northeastern slope of Grand Mesa. The mesa is composed of horizontally bedded, tertiary rocks belonging to the Wasatch and Green River formations and capped by lave flow of Quaternary basalt. During Pleistocene times, sheet-like glaciers covered the mesa. Glacial scouring produced the many small mesa lakes and the heterogeneous deposits of glacial debris, which mantle a large part of the surface rock. These glacial deposits cover the lava in varying depths from one hundred to several hundred feet. The Vega Damsite is in an erosional narrows cut across the toe of a large fan. Overburden debris covers bedrock at the damsite to a depth of 135 feet, becoming progressively deeper to the south. The fan is composed of clayey silt containing basalt boulders. It is compact and seepage tests indicate that it is watertight. Even with a high water table, little or no slumping of side slopes has occurred, and other field evidence indicates good stability.

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: Collbran Conservancy District,
PO Box 163, Collbran, CO 81624, (970) 487-3306