Portland
Low HazardSatisfactory ConditionEmergency Action Plan: Not Required
Location
| State | Michigan |
| County | Ionia |
| Nearest City | Lyons |
| River/Stream | Grand River |
| Coordinates | 42.88910, -84.93080 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 15 ft |
| Dam Height | 9 ft |
| Dam Length | 680 ft |
| Year Completed | 1919 (107 years old) |
Storage & Hydraulics
| NID Storage | 186 acre-ft |
| Max Storage | 186 acre-ft |
| Normal Storage | 117 acre-ft |
| Surface Area | 30 acres |
| Drainage Area | 1,700 sq mi |
| Max Discharge | 2,400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner Type | Not Listed |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/20/2022 |
| Emergency Action Plan | Not Required |