Greenwood Afterbay Dam
Significant HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| State | Michigan |
| County | Marquette |
| Nearest City | Gwinn |
| River/Stream | Middle Branch Escanaba River |
| Coordinates | 46.43474, -87.78537 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 610 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 1,080 acre-ft |
| Max Storage | 1,080 acre-ft |
| Normal Storage | 480 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 71 sq mi |
| Max Discharge | 1,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Tilden Mining Company LC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/01/2016 |
| Emergency Action Plan | Yes |