Orr is an earth dam located in Crook County, Wyoming, built in 1976. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 33 ft33 ft tall and 1,635 ft long, taller than 76% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Orr
The primary purpose of Orr is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Spring Creek Livestock (att. A. Mills) (private). It impounds the Spring Branch.
The dam stands 33 feet tall and stretches 1,635 feet across, creates a reservoir covering 58 acres, has a maximum storage capacity of 739 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1976, the structure is 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 06/19/2024.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Wyoming |
| County | Crook |
| River/Stream | Spring Branch |
| Coordinates | 44.24333, -104.45528 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 1,635 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 739 acre-ft |
| Max Storage | 739 acre-ft |
| Normal Storage | 351 acre-ft |
| Surface Area | 58 acres |
| Drainage Area | 5 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Spring Creek Livestock (att. A. Mills) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/19/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01518 |
| Federal ID | WY01518 |
| More Info | State Dam Safety Program |