Junction Falls is a gravity dam located in Pierce County, Wisconsin, built in 1920. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 32 ft32 ft tall and 144 ft long, taller than 74% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Junction Falls
The primary purpose of Junction Falls is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by River Falls, City of (local government). It impounds the Kinnickinnic River near River Falls.
The dam stands 32 feet tall and stretches 144 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 142 acre-feet, and collects water from a drainage area of 100 square miles. Completed in 1920, the structure is over a century 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 06/29/2022.
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Location
| State | Wisconsin |
| County | Pierce |
| Nearest City | River Falls |
| River/Stream | Kinnickinnic River |
| Coordinates | 44.85520, -92.63350 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 144 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 142 acre-ft |
| Max Storage | 142 acre-ft |
| Normal Storage | 142 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 100 sq mi |
| Max Discharge | 11,160 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | River Falls, City of |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/29/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00021 |
| Federal ID | WI00021 |
| More Info | State Dam Safety Program |