CO01695 - Vallecito Dam


Home \| About Us \| News \| Programs & Activities \| Library \| Water Operations \| Site Index

Vallecito Dam


	Statistics

General

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

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

County ................................ LaPlata

Project: ................................ Pine River

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

Location: ............................ 18 mi NE of Durango

Watercourse: ..................... Pine River

Reservoir: ........................... Vallecito

Construction Date: ........... 1938-1941

National ID Number ......... CO01695

Hydrologic Unit Code .....

Dimensions

Crest Elevation of Dam: .................... 7673.00 ft

Structural Height of Dam: ................. 162.00 ft

Crest Length: ...................................... 4010.00 ft

Top of Joint Use: ............................... 7665.00 ft

Top of Active Conservation: ............. NA

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

Spillway Crest: .................................... 7646.00 ft

Top of Dead Storage: ........................ 7582.54 ft

Streambed at Dam Axis : ................... 7547.00 ft

Hydraulics

Normal Water Surface Elev: ............... 7665.0 ft

Hydraulic Height: ................................ 126.0 ft

Service Spillway Type:

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

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

Crest Length ..................................... 111.0 ft

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

Capacity at Elev: 7665.0 ft, 30 ,000 cfs

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

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

Outlet Works Capacity at

Elevation 7665.0 ft., ....................... 3100 cfs

Hydrology

Drainage Area: ................................ 255.0 sq mi

Hydrometeorological Report(HMR) HMR 49

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

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

Probable Maximum Flood (PMF) Report:

Peak Inflow: ..................................... 76,000 cfs

Inflow Volume: ........................ 305,000 acre-ft

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

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

Initial Routing Elev: ........................... 7600.0 ft

Study Date: ............................. December 1984

Power Generation

Power Generation at Dam Site - Vallecito Powerplant

Bureau of Reclamation Power Program

Narration

Geology

Vallecito Dam is located on a terminal glacial moraine that extends across the valley floor and is up to 200 feet thick. The moraine consists of poorly sorted clay, sand gravel and cobbles with localized pockets of loose sand in the vicinity of the river channel. Red to gray micaceous siltstones, shales and sandstones of the Culer Formation (lower Permian) are exposed at both abutments. A 3-foot thick limestone bed is exposed at the left abutment and dips to the northwest at 16 degrees; bedrock at the right abutment dips 2 to 7 degrees to the northwest. The bedrock is highly fractured and subject to erosion. There does not appear to be any unusual settlement of the dam embankment.

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: Pine River Irrigation District,
13029 County Road 501, Bayfield, CO 81122, (970) 884-2558