Mcmillan Marsh
Mcmillan Marsh is an earth dam located in Marathon County, Wisconsin, built in 1971. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Mcmillan Marsh
The primary purpose of Mcmillan Marsh is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Wisconsin Department Of Natural Resources (state). It impounds the Little Eau Pleine.
The dam stands 11 feet tall and stretches 7,900 feet across, creates a reservoir covering 690 acres, has a maximum storage capacity of 4,900 acre-feet, and collects water from a drainage area of 49 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 11/03/2020.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wisconsin |
| County | Marathon |
| Nearest City | None |
| River/Stream | Little Eau Pleine |
| Coordinates | 44.73690, -90.19845 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 7,900 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 4,900 acre-ft |
| Max Storage | 4,900 acre-ft |
| Normal Storage | 2,800 acre-ft |
| Surface Area | 690 acres |
| Drainage Area | 49 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Wisconsin Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/03/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00881 |
| Federal ID | WI00881 |
| More Info | State Dam Safety Program |