CO01670 - Willow Creek Dam


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

Willow Creek Dam


	Statistics

General

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

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

County ....................... Grand

Project: ....................... Colorado-Big Thompson

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

Location: .................... 4 mi N of Granby

Watercourse: ............ Willow Creek

Reservoir: ...................Willow Creek

Construction Date: ....1951-1953

National ID Number ... CO01670

Hydrologic Unit Code ...

Dimensions

Crest Elevation of Dam: ......................8140.0 ft

Structural Height of Dam: ................... 127.0 ft

Crest Length: ........................................1100.0 ft

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

Top of Active Conservation: ............ 8130.0 ft

Top of Inactive Conservation: .......... 8117.0 ft

Spillway Crest: ..................................... 8130.0 ft

Top of Dead Storage: ......................... 8077.0 ft

Streambed at Dam Axis : .................... 8037.0 ft

Hydraulics

Normal Water Surface Elev.: ...............8130.0 ft

Hydraulic Height: ..................................... 95.0 ft

Service Spillway Type:

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

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

Crest Length ........................................ 354 ft

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

Capacity at Elev.: 8132.0 ft, 3,200 cfs

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

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

Outlet Works Capacity at

Elevation 8132.0 ft., ....................... 2,405 cfs

Hydrology

Drainage Area: ..................................134.0 sq mi

Hydrometeorological Report HMR 49

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

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

Probable Maximum Flood (PMF) Report:

Peak Inflow: ...................................... 44,300 cfs

Inflow Volume: ..........................109,300 acre-ft

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

PMF Routing MWS Elev.: ....................... N/A

Initial Routing Elev.: .......................... 8130.0 ft

Study Date: ...................................... June 1996

Power Generation

Power Generation at Dam Site - None

Bureau of Reclamation Power Program

Narration

Geology

Materials within and surrounding the area of Willow Creek Dam and Reservoir include Cretaceous and Paleocene sedimentary rocks, Miocene basalt flows with interlayered mudstone, siltstone and sandstone of the same age, Pleistocene terrace deposits and alluvium and terrace deposits of Holocene age. The dam and appurtenant structures are situated in an area of Miocene basalt flows and interlayered tuffaceous mudstone, siltstone and sandstone. Most of the older sedimentary rocks, as well as younger surficial materials occur within the upper reaches of the reservoir. At the time investigations were conducted, the sedimentary rocks interlayered with Miocene basalt flows were refereed to as the North Platte formation. Since that time there has been a change in nomenclature. The subject sedimentary rocks are now called the Troublesome formation.

Links

| Recreation |

| Dams Located by State | USBR Colorado Dams | South Great Plains Region Dams |

| Owner: Bureau of Reclamation, Eastern Colorado Area Office,
11056 West County Road 18E, Loveland, CO 80537-9711, (970) 667-4410

| Operator: Northern Colorado Water Conservancy District,
PO Box 679, Loveland, CO 80539, (970) 667-2437