Grandmother
High HazardFair ConditionEmergency Action Plan: Yes
Location
| State | Wisconsin |
| County | Lincoln |
| Nearest City | Merrill |
| River/Stream | Wisconsin River |
| Coordinates | 45.36680, -89.72930 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 724 ft |
| Year Completed | 1923 (103 years old) |
Storage & Hydraulics
| NID Storage | 1,940 acre-ft |
| Max Storage | 1,940 acre-ft |
| Normal Storage | 1,940 acre-ft |
| Surface Area | 758 acres |
| Drainage Area | 2,269 sq mi |
| Max Discharge | 61,500 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | PCA Hydro Inc. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 09/13/2022 |
| Emergency Action Plan | Yes |