Collins Marsh
Collins Marsh is a gravity dam located in Manitowoc County, Wisconsin, built in 1965. It carries a Low hazard potential classification and has a fair condition assessment.
About Collins Marsh
The primary purpose of Collins Marsh 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 Mud Creek near Clark Mills.
The dam stands 10 feet tall and stretches 800 feet across, creates a reservoir covering 2,000 acres, has a maximum storage capacity of 7,000 acre-feet, and collects water from a drainage area of 58 square miles. Completed in 1965, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 09/14/2021.
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Location
| State | Wisconsin |
| County | Manitowoc |
| Nearest City | Clark Mills |
| River/Stream | Mud Creek |
| Coordinates | 44.08420, -87.96627 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 800 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 7,000 acre-ft |
| Max Storage | 7,000 acre-ft |
| Normal Storage | 1,000 acre-ft |
| Surface Area | 2,000 acres |
| Drainage Area | 58 sq mi |
| Max Discharge | 4,470 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Wisconsin Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/14/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00657 |
| Federal ID | WI00657 |
| More Info | State Dam Safety Program |