Lower Power is a gravity dam located in St. Croix County, Wisconsin, built in 1866. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 400 ft long. 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 Lower Power
The primary purpose of Lower Power is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Hudson (local government). It impounds the Willow River near Hudson.
The dam stands 22 feet tall and stretches 400 feet across, creates a reservoir covering 270 acres, has a maximum storage capacity of 3,000 acre-feet, and collects water from a drainage area of 175 square miles. Completed in 1866, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 04/06/2021.
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Location
| State | Wisconsin |
| County | St. Croix |
| Nearest City | Hudson |
| River/Stream | Willow River |
| Coordinates | 44.98661, -92.76162 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 400 ft |
| Year Completed | 1866 (160 years old) |
Storage & Hydraulics
| NID Storage | 3,000 acre-ft |
| Max Storage | 3,000 acre-ft |
| Normal Storage | 1,388 acre-ft |
| Surface Area | 270 acres |
| Drainage Area | 175 sq mi |
| Max Discharge | 15,900 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Hudson |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/06/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00187 |
| Federal ID | WI00187 |
| More Info | State Dam Safety Program |