Autumn Ridge Detention Dam is an earth dam located in Macomb County, Michigan, built in 1982. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 34 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Autumn Ridge Detention Dam
Autumn Ridge Detention Dam is a dam in Macomb, Michigan. The dam is owned by Macomb County (local government). It impounds the Shanahan Drain near Forest City.
The dam stands 11 feet tall and stretches 34 feet across, creates a reservoir covering 1 acres, and has a maximum storage capacity of 23 acre-feet. Completed in 1982, the structure is 44 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. The most recent inspection on record was 07/06/1982. That was over 44 years ago.
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Location
| State | Michigan |
| County | Macomb |
| Nearest City | Forest City |
| River/Stream | Shanahan Drain |
| Coordinates | 42.55667, -83.08167 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 34 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 23 acre-ft |
| Max Storage | 23 acre-ft |
| Surface Area | 1 acres |
| Max Discharge | 400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Macomb County |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/06/1982 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MI02425 |
| Federal ID | MI02425 |
| More Info | State Dam Safety Program |