Lake St Helen Lake Level Control
Lake St Helen Lake Level Control is a gravity dam located in Roscommon County, Michigan, built in 1930. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Lake St Helen Lake Level Control
The primary purpose of Lake St Helen Lake Level Control is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Roscommon County (private). It impounds the South Branch Au Sable River near Geels.
The dam stands 8 feet tall and stretches 200 feet across, creates a reservoir covering 2,400 acres, and has a maximum storage capacity of 7,700 acre-feet. Completed in 1930, the structure is well-established, with more than 75 years of service.
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 07/15/2019.
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Location
| State | Michigan |
| County | Roscommon |
| Nearest City | Geels |
| River/Stream | South Branch Au Sable River |
| Coordinates | 44.40833, -84.46333 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 200 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 7,700 acre-ft |
| Max Storage | 7,700 acre-ft |
| Normal Storage | 3,360 acre-ft |
| Surface Area | 2,400 acres |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Roscommon County |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/15/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI01810 |
| Federal ID | MI01810 |
| More Info | State Dam Safety Program |