Mackey is an earth dam located in Park County, Wyoming, built in 2000. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 15 ft15 ft tall and 1,535 ft long. 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 Mackey
The primary purpose of Mackey is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Greybull Valley Irrigation District (private). It impounds the Mackey Gulch near Unnamed Ranch.
The dam stands 15 feet tall and stretches 1,535 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 179 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 2000, the structure is 26 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 04/20/2020.
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Location
| State | Wyoming |
| County | Park |
| Nearest City | Unnamed Ranch |
| River/Stream | Mackey Gulch |
| Coordinates | 44.33170, -108.64200 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 1,535 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 179 acre-ft |
| Max Storage | 179 acre-ft |
| Normal Storage | 123 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 59 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Greybull Valley Irrigation District |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/20/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY02235 |
| Federal ID | WY02235 |
| More Info | State Dam Safety Program |