Rock
Rock is an arch dam located in Clark County, Wisconsin, built in 1938. It carries a Low hazard potential classification and has a fair condition assessment.
About Rock
The primary purpose of Rock is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Clark County (local government). It impounds the Hay Creek.
The dam stands 20 feet tall and stretches 150 feet across, creates a reservoir covering 118 acres, has a maximum storage capacity of 1,240 acre-feet, and collects water from a drainage area of 59 square miles. Completed in 1938, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 04/23/2015. That was over 10 years ago.
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Location
| State | Wisconsin |
| County | Clark |
| Nearest City | None |
| River/Stream | Hay Creek |
| Coordinates | 44.73362, -90.84671 |
Physical Characteristics
| Dam Type | Arch |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 150 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 1,240 acre-ft |
| Max Storage | 1,240 acre-ft |
| Normal Storage | 526 acre-ft |
| Surface Area | 118 acres |
| Drainage Area | 59 sq mi |
| Max Discharge | 4,260 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Clark County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 04/23/2015 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00112 |
| Federal ID | WI00112 |
| More Info | State Dam Safety Program |