State Street Dam
State Street Dam is a gravity dam located in Gratiot County, Michigan, built in 1938. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About State Street Dam
The primary purpose of State Street Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Alma (local government). It impounds the Pine River near Alma.
The dam stands 18 feet tall and stretches 355 feet across, creates a reservoir covering 140 acres, has a maximum storage capacity of 1,500 acre-feet, and collects water from a drainage area of 308 square miles. Completed in 1938, the structure is well-established, with more than 75 years of service.
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 05/14/2018.
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Location
| State | Michigan |
| County | Gratiot |
| Nearest City | Alma |
| River/Stream | Pine River |
| Coordinates | 43.37533, -84.66187 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 355 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 1,500 acre-ft |
| Max Storage | 1,500 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 140 acres |
| Drainage Area | 308 sq mi |
| Max Discharge | 5,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Alma |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/14/2018 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MI00005 |
| Federal ID | MI00005 |
| More Info | State Dam Safety Program |