Hillman
Hillman is a gravity dam located in Montmorency County, Michigan, built in 1895. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Hillman
The primary purpose of Hillman is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. It impounds the Thunder Bay near Hillman.
The dam stands 16 feet tall and stretches 128 feet across, creates a reservoir covering 160 acres, has a maximum storage capacity of 500 acre-feet, and collects water from a drainage area of 249 square miles. Completed in 1895, 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/17/2019.
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Location
| State | Michigan |
| County | Montmorency |
| Nearest City | Hillman |
| River/Stream | Thunder Bay |
| Coordinates | 45.06160, -83.90350 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 128 ft |
| Year Completed | 1895 (131 years old) |
Storage & Hydraulics
| NID Storage | 500 acre-ft |
| Max Storage | 500 acre-ft |
| Normal Storage | 500 acre-ft |
| Surface Area | 160 acres |
| Drainage Area | 249 sq mi |
| Max Discharge | 2,100 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner Type | Not Listed |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/17/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI00173 |
| Federal ID | MI00173 |
| More Info | State Dam Safety Program |