Oak Creek
Oak Creek is an earth dam located in Crook County, Wyoming, built in 1976. It carries a Significant hazard potential classification and has a fair condition assessment.
About Oak Creek
The primary purpose of Oak Creek is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Jensen Ranch (private). It impounds the Alum Creek Or Oak Ckeek near Belle Fourche, Sd.
The dam stands 41 feet tall and stretches 1,600 feet across, creates a reservoir covering 105 acres, has a maximum storage capacity of 2,500 acre-feet, and collects water from a drainage area of 45 square miles. Completed in 1976, the structure is 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. The most recent inspection on record was 04/23/2025.
At 41 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Wyoming |
| County | Crook |
| Nearest City | Belle Fourche, Sd |
| River/Stream | Alum Creek Or Oak Ckeek |
| Coordinates | 44.75210, -104.09910 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 1,600 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 2,500 acre-ft |
| Max Storage | 2,500 acre-ft |
| Normal Storage | 915 acre-ft |
| Surface Area | 105 acres |
| Drainage Area | 45 sq mi |
| Max Discharge | 2,019 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JENSEN RANCH |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 04/23/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01366 |
| Federal ID | WY01366 |
| More Info | State Dam Safety Program |