Jonesville Millpond Dam
Jonesville Millpond Dam is an earth dam located in Hillsdale County, Michigan, built in 1872. It carries a Low hazard potential classification.
About Jonesville Millpond Dam
The primary purpose of Jonesville Millpond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Jack Mosley (private). It impounds the Saint Joseph River near Jonesville.
The dam stands 9 feet tall and stretches 500 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 170 acre-feet, and collects water from a drainage area of 63 square miles. Completed in 1872, the structure is one of the older dams in the region, with over a century and a half 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. The most recent inspection on record was 09/22/1994. That was over 31 years ago.
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Location
| State | Michigan |
| County | Hillsdale |
| Nearest City | Jonesville |
| River/Stream | Saint Joseph River |
| Coordinates | 41.97333, -84.66000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 500 ft |
| Year Completed | 1872 (154 years old) |
Storage & Hydraulics
| NID Storage | 170 acre-ft |
| Max Storage | 170 acre-ft |
| Normal Storage | 90 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 63 sq mi |
| Max Discharge | 650 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Jack Mosley |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 09/22/1994 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00712 |
| Federal ID | MI00712 |
| More Info | State Dam Safety Program |