Allen Basin
Allen Basin is an earth dam located in Rio Blanco County, Colorado, built in 1956. It carries a Significant hazard potential classification and has a fair condition assessment.
About Allen Basin
The primary purpose of Allen Basin is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Allen Basin Reservoir Co. Inc. (rossi, Mark) (private). It impounds the Middle Hunt Creek near Oak Creek.
The dam stands 58 feet tall and stretches 690 feet across, creates a reservoir covering 93 acres, has a maximum storage capacity of 2,808 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1956, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 09/08/2022.
At 58 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Colorado |
| County | Rio Blanco |
| Nearest City | Oak Creek |
| River/Stream | Middle Hunt Creek |
| Coordinates | 40.16057, -107.04140 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 58 ft |
| Dam Height | 52 ft |
| Dam Length | 690 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 2,808 acre-ft |
| Max Storage | 2,808 acre-ft |
| Normal Storage | 2,250 acre-ft |
| Surface Area | 93 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,362 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | ALLEN BASIN RESERVOIR CO. INC. (ROSSI, MARK) |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/08/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO01018 |
| Federal ID | CO01018 |
| More Info | State Dam Safety Program |