Brock
Brock is a gravity dam located in Marinette County, Wisconsin, built in 1971. It carries a Low hazard potential classification and has a fair condition assessment.
About Brock
The primary purpose of Brock is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Coleman Lake Club (private). It impounds the South Branch Pike.
The dam stands 16 feet tall and stretches 50 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 250 acre-feet, and collects water from a drainage area of 34 square miles. Completed in 1971, 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. The most recent inspection on record was 05/22/2020.
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Location
| State | Wisconsin |
| County | Marinette |
| Nearest City | None |
| River/Stream | South Branch Pike |
| Coordinates | 45.57432, -88.28427 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 50 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Normal Storage | 90 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 34 sq mi |
| Max Discharge | 798 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | COLEMAN LAKE CLUB |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/22/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00688 |
| Federal ID | WI00688 |
| More Info | State Dam Safety Program |