Thompsonville Dam
Thompsonville Dam is an earth dam located in Benzie County, Michigan, built in 1901. It carries a Low hazard potential classification.
About Thompsonville Dam
The primary purpose of Thompsonville Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Robert Mortenson (private). It impounds the Betsie River near Elberta.
The dam stands 20 feet tall and stretches 300 feet across, creates a reservoir covering 16 acres, and has a maximum storage capacity of 165 acre-feet. Completed in 1901, the structure is over a century 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. The most recent inspection on record was 05/25/1989. That was over 36 years ago.
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Location
| State | Michigan |
| County | Benzie |
| Nearest City | Elberta |
| River/Stream | Betsie River |
| Coordinates | 44.52833, -85.94833 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 300 ft |
| Year Completed | 1901 (125 years old) |
Storage & Hydraulics
| NID Storage | 165 acre-ft |
| Max Storage | 165 acre-ft |
| Normal Storage | 70 acre-ft |
| Surface Area | 16 acres |
| Max Discharge | 1,860 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Robert Mortenson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 05/25/1989 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00507 |
| Federal ID | MI00507 |
| More Info | State Dam Safety Program |