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.
General
Project
Colorado-Big Thompson
Longitude
-105.9417
Watercourse
Willow Creek
Reservoir
Willow Creek
Original Construction
1951-1953
National ID Number
CO01670
Latitude
40.1467
Dimensions
Structural Height
127.0 ft
Crest Length
1100.0 ft
Top of Active Conservation Pool (Elevation)
8130.0 ft
Top of Inactive Conservation Pool (Elevation)
8117.0 ft
Streambed at Dam Axis
8037.0 ft
Crest Elevation
8140.0 ft
Hydraulic Height (Normal Operating Depth at Dam)
95.0 ft
Top of Dead Storage Pool (Elevation)
8077.0 ft
Hydraulics & Hydrology
Spillway Capacity at Elevation
3200 cfs at 8132.0 ft
Outlet Works Capacity at Elevation
2405 cfs at 8132.0 ft
Drainage Area
134.0 sq mi
Hydrometeorological Report (HMR)
HMR 49
Normal Water Surface Elevation
8130.0 ft
Auxiliary Spillway
No
Contact
Owner
Title: Area Office Manager Organization: Eastern Colorado Area Office Address: 11056 W. County Rd 18E City: Loveland, CO 80537-9711 Fax: 970-663-3212 Phone: 970-461-5410
Operator
Organization: Northern Colorado Water Conservancy District Address: 220 Water Ave. City: Berthoud, CO 80513 Phone: 800-369-7246
More Information about the U.S. Bureau of Reclamation