Pattison State Park
Pattison State Park is a gravity dam located in Douglas County, Wisconsin, built in 1931. It carries a Significant hazard potential classification and has a fair condition assessment.
About Pattison State Park
The primary purpose of Pattison State Park is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Wisconsin Department Of Natural Resources (state). It impounds the Black River.
The dam stands 20 feet tall and stretches 300 feet across, creates a reservoir covering 27 acres, has a maximum storage capacity of 340 acre-feet, and collects water from a drainage area of 78 square miles. Completed in 1931, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 09/30/2020.
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Location
| State | Wisconsin |
| County | Douglas |
| Nearest City | None |
| River/Stream | Black River |
| Coordinates | 46.53558, -92.12085 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 300 ft |
| Year Completed | 1931 (95 years old) |
Storage & Hydraulics
| NID Storage | 340 acre-ft |
| Max Storage | 340 acre-ft |
| Normal Storage | 180 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 78 sq mi |
| Max Discharge | 4,194 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Wisconsin Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/30/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00127 |
| Federal ID | WI00127 |
| More Info | State Dam Safety Program |