Lewis is an earth dam located in Polk County, Wisconsin, built in 1931. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 50 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Lewis
The primary purpose of Lewis is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Nelson, Scott (private). It impounds the Knapp Creek.
The dam stands 16 feet tall and stretches 50 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 300 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1931, the structure is well-established, with more than 75 years 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 09/25/2019.
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Location
| State | Wisconsin |
| County | Polk |
| Nearest City | None |
| River/Stream | Knapp Creek |
| Coordinates | 45.70705, -92.37137 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 50 ft |
| Year Completed | 1931 (95 years old) |
Storage & Hydraulics
| NID Storage | 300 acre-ft |
| Max Storage | 300 acre-ft |
| Normal Storage | 130 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 757 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Nelson, Scott |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/25/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00175 |
| Federal ID | WI00175 |
| More Info | State Dam Safety Program |