Sleepy Hollow Dam
Sleepy Hollow Dam is an earth dam located in Clinton County, Michigan, built in 1974. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Sleepy Hollow Dam
The primary purpose of Sleepy Hollow Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Mdnr Parks & Recreation (state). It impounds the Little Maple River near Shepardsville.
The dam stands 30 feet tall and stretches 1,072 feet across, creates a reservoir covering 413 acres, has a maximum storage capacity of 7,919 acre-feet, and collects water from a drainage area of 10 square miles. Completed in 1974, the structure is well into its service life at over 50 years 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 10/28/2020.
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Location
| State | Michigan |
| County | Clinton |
| Nearest City | Shepardsville |
| River/Stream | Little Maple River |
| Coordinates | 42.94667, -84.41833 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 1,072 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 7,919 acre-ft |
| Max Storage | 7,919 acre-ft |
| Normal Storage | 3,923 acre-ft |
| Surface Area | 413 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 6,289 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | MDNR Parks & Recreation |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/28/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MI00717 |
| Federal ID | MI00717 |
| More Info | State Dam Safety Program |