St Louis
St Louis is a gravity dam located in Gratiot County, Michigan, built in 1901. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About St Louis
The primary purpose of St Louis is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by City Of St Louis (public utility). It impounds the Pine Creek near St Louis.
The dam stands 21 feet tall and stretches 126 feet across, creates a reservoir covering 225 acres, has a maximum storage capacity of 1,575 acre-feet, and collects water from a drainage area of 288 square miles. Completed in 1901, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/18/2022.
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Location
| State | Michigan |
| County | Gratiot |
| Nearest City | St Louis |
| River/Stream | Pine Creek |
| Coordinates | 43.41270, -84.60710 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 126 ft |
| Year Completed | 1901 (125 years old) |
Storage & Hydraulics
| NID Storage | 1,575 acre-ft |
| Max Storage | 1,575 acre-ft |
| Normal Storage | 885 acre-ft |
| Surface Area | 225 acres |
| Drainage Area | 288 sq mi |
| Max Discharge | 7,200 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | City of St Louis |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/18/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MI00551 |
| Federal ID | MI00551 |
| More Info | State Dam Safety Program |