Lake Mckinney is an earth dam located in Big Horn County, Wyoming, built in 1939. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 735 ft long, taller than 55% 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 Lake Mckinney
The primary purpose of Lake Mckinney is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John J. Bullinger & Sons Inc. (private). It impounds the Mckinney Cr, Trib Greybull Riv near Greybull.
The dam stands 26 feet tall and stretches 735 feet across, creates a reservoir covering 41 acres, and has a maximum storage capacity of 550 acre-feet. Completed in 1939, the structure is well-established, with more than 75 years of service.
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 06/23/2022.
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Location
| State | Wyoming |
| County | Big Horn |
| Nearest City | Greybull |
| River/Stream | Mckinney Cr, Trib Greybull Riv |
| Coordinates | 44.42170, -108.23680 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 735 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 550 acre-ft |
| Max Storage | 550 acre-ft |
| Normal Storage | 305 acre-ft |
| Surface Area | 41 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | John J. Bullinger & Sons Inc. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/23/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01163 |
| Federal ID | WY01163 |
| More Info | State Dam Safety Program |