Oconomowoc Lake
Oconomowoc Lake is a gravity dam located in Waukesha County, Wisconsin, built in 1899. It carries a Low hazard potential classification and has a fair condition assessment.
About Oconomowoc Lake
The primary purpose of Oconomowoc Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Village Of Oconomowoc Lake (local government). It impounds the Outlet Oconomowoc Lake near Oconomowoc.
The dam stands 7 feet tall and stretches 60 feet across, creates a reservoir covering 721 acres, has a maximum storage capacity of 1,810 acre-feet, and collects water from a drainage area of 87 square miles. Completed in 1899, the structure is over a century 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. The most recent inspection on record was 08/17/2021.
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Location
| State | Wisconsin |
| County | Waukesha |
| Nearest City | Oconomowoc |
| River/Stream | Outlet Oconomowoc Lake |
| Coordinates | 43.10445, -88.46946 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 60 ft |
| Year Completed | 1899 (127 years old) |
Storage & Hydraulics
| NID Storage | 5,000 acre-ft |
| Max Storage | 1,810 acre-ft |
| Normal Storage | 5,000 acre-ft |
| Surface Area | 721 acres |
| Drainage Area | 87 sq mi |
| Max Discharge | 1,790 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | VILLAGE OF OCONOMOWOC LAKE |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/17/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI01144 |
| Federal ID | WI01144 |
| More Info | State Dam Safety Program |