Thiensville
Thiensville is a gravity dam located in Ozaukee County, Wisconsin, built in 1842. It carries a Low hazard potential classification and has a fair condition assessment.
About Thiensville
The primary purpose of Thiensville is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City Of Mequon (local government). It impounds the Milwaukee near Thiensville.
The dam stands 13 feet tall and stretches 370 feet across, creates a reservoir covering 45 acres, has a maximum storage capacity of 2,200 acre-feet, and collects water from a drainage area of 594 square miles. Completed in 1842, 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 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 08/24/2016.
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Location
| State | Wisconsin |
| County | Ozaukee |
| Nearest City | Thiensville |
| River/Stream | Milwaukee |
| Coordinates | 43.23072, -87.97914 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 370 ft |
| Year Completed | 1842 (184 years old) |
Storage & Hydraulics
| NID Storage | 2,200 acre-ft |
| Max Storage | 2,200 acre-ft |
| Normal Storage | 700 acre-ft |
| Surface Area | 45 acres |
| Drainage Area | 594 sq mi |
| Max Discharge | 7,600 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Mequon |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/24/2016 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00539 |
| Federal ID | WI00539 |
| More Info | State Dam Safety Program |