Republic Dam
Republic Dam is a gravity dam located in Marquette County, Michigan, built in 1913. It carries a Significant hazard potential classification and has a poor condition assessment.
About Republic Dam
The primary purpose of Republic Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Republic Mountain Lake Llc (private). It impounds the Michigamme River near Floodwood.
The dam stands 22 feet tall and stretches 400 feet across, creates a reservoir covering 145 acres, has a maximum storage capacity of 1,650 acre-feet, and collects water from a drainage area of 240 square miles. Completed in 1913, the structure is over a century old.
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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 09/19/2019.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Michigan |
| County | Marquette |
| Nearest City | Floodwood |
| River/Stream | Michigamme River |
| Coordinates | 46.38833, -87.98500 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 400 ft |
| Year Completed | 1913 (113 years old) |
Storage & Hydraulics
| NID Storage | 1,650 acre-ft |
| Max Storage | 1,650 acre-ft |
| Normal Storage | 850 acre-ft |
| Surface Area | 145 acres |
| Drainage Area | 240 sq mi |
| Max Discharge | 3,700 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Republic Mountain Lake LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 09/19/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MI00579 |
| Federal ID | MI00579 |
| More Info | State Dam Safety Program |