Overview
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 |
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