Grandfather Falls
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| State | Wisconsin |
| County | Lincoln |
| Nearest City | Merrill |
| River/Stream | Wisconsin River |
| Coordinates | 45.31330, -89.78500 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 700 ft |
| Year Completed | 1906 (120 years old) |
Storage & Hydraulics
| NID Storage | 2,540 acre-ft |
| Max Storage | 2,450 acre-ft |
| Normal Storage | 2,540 acre-ft |
| Surface Area | 200 acres |
| Drainage Area | 2,293 sq mi |
| Max Discharge | 59,830 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Wisconsin Public Service Corporation |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/20/2022 |
| Emergency Action Plan | Yes |