Mill Creek Structure 3 Dam
Mill Creek Structure 3 Dam is an earth dam located in Clark County, Illinois, built in 1976. It carries a Significant hazard potential classification.
About Mill Creek Structure 3 Dam
The primary purpose of Mill Creek Structure 3 Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Mill Creek Conservancy District (private). It impounds the East Mill Creek near Marshall.
The dam stands 38 feet tall and stretches 1,030 feet across, creates a reservoir covering 88 acres, has a maximum storage capacity of 5,927 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1976, the structure is 50 years old.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/27/2022.
At 38 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Illinois |
| County | Clark |
| Nearest City | Marshall |
| River/Stream | East Mill Creek |
| Coordinates | 39.39505, -87.73157 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 1,030 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 5,927 acre-ft |
| Max Storage | 5,927 acre-ft |
| Normal Storage | 363 acre-ft |
| Surface Area | 88 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 25,654 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | MILL CREEK CONSERVANCY DISTRICT |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 05/27/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL01234 |
| Federal ID | IL01234 |
| More Info | State Dam Safety Program |