Willow Run Hydro Dam
Willow Run Hydro Dam is a concrete dam located in Washtenaw County, Michigan, built in 1941. It carries a Low hazard potential classification and has a fair condition assessment.
About Willow Run Hydro Dam
The primary purpose of Willow Run Hydro Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Washtenaw County Drain Commissioner (private). It impounds the Willow Run near Belleville.
The dam stands 20 feet tall and stretches 184 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 79 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1941, 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 10/23/2019.
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Location
| State | Michigan |
| County | Washtenaw |
| Nearest City | Belleville |
| River/Stream | Willow Run |
| Coordinates | 42.24080, -83.55968 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 184 ft |
| Year Completed | 1941 (85 years old) |
Storage & Hydraulics
| NID Storage | 79 acre-ft |
| Max Storage | 79 acre-ft |
| Normal Storage | 47 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 930 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Washtenaw County Drain Commissioner |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/23/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00944 |
| Federal ID | MI00944 |
| More Info | State Dam Safety Program |