Harrington
Harrington is an earth dam located in Big Horn County, Wyoming, built in 1974. It carries a Significant hazard potential classification and has a poor condition assessment.
About Harrington
The primary purpose of Harrington is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Kohns Ranch (private). It impounds the Manny Draw near Greybull.
The dam stands 30 feet tall and stretches 1,817 feet across, creates a reservoir covering 185 acres, has a maximum storage capacity of 2,126 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1974, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 05/12/2021.
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Location
| State | Wyoming |
| County | Big Horn |
| Nearest City | Greybull |
| River/Stream | Manny Draw |
| Coordinates | 44.35680, -108.31690 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 1,817 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 2,126 acre-ft |
| Max Storage | 2,126 acre-ft |
| Normal Storage | 1,202 acre-ft |
| Surface Area | 185 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 368 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | KOHNS RANCH |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/12/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01164 |
| Federal ID | WY01164 |
| More Info | State Dam Safety Program |