Unadilla Mill Dam is an earth dam located in Livingston County, Michigan, built in 1860. It carries a Significant hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 376 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 Unadilla Mill Dam
The primary purpose of Unadilla Mill Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Scott Vansweringen (private). It impounds the Hell Creek near Unadilla.
The dam stands 10 feet tall and stretches 376 feet across, creates a reservoir covering 4 acres, and has a maximum storage capacity of 65 acre-feet. Completed in 1860, the structure is one of the older dams in the region, with over a century and a half of service.
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. The most recent inspection on record was 01/01/1901. That was over 125 years ago.
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Location
| State | Michigan |
| County | Livingston |
| Nearest City | Unadilla |
| River/Stream | Hell Creek |
| Coordinates | 42.43000, -84.05167 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 376 ft |
| Year Completed | 1860 (166 years old) |
Storage & Hydraulics
| NID Storage | 65 acre-ft |
| Max Storage | 65 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 4 acres |
| Max Discharge | 70 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Scott Vansweringen |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 01/01/1901 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00605 |
| Federal ID | MI00605 |
| More Info | State Dam Safety Program |