O'neil Flowage 1 is an earth dam located in Chippewa County, Wisconsin, built in 1965. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 270 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 O'neil Flowage 1
The primary purpose of O'neil Flowage 1 is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Chippewa County (local government). It impounds the O'neil Creek.
The dam stands 10 feet tall and stretches 270 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 325 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, the structure is well into its service life at over 50 years old.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/08/2013. That was over 13 years ago.
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Location
| State | Wisconsin |
| County | Chippewa |
| Nearest City | None |
| River/Stream | O'neil Creek |
| Coordinates | 45.19992, -91.35553 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 270 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 325 acre-ft |
| Max Storage | 325 acre-ft |
| Normal Storage | 172 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 60 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Chippewa County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/08/2013 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI01004 |
| Federal ID | WI01004 |
| More Info | State Dam Safety Program |