Mill Creek Structure 9 Dam
Mill Creek Structure 9 Dam is an earth dam located in Clark County, Illinois, built in 1986. It carries a Low hazard potential classification.
About Mill Creek Structure 9 Dam
The primary purpose of Mill Creek Structure 9 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 Joes Fork near Snyder.
The dam stands 46 feet tall and stretches 760 feet across, and has a maximum storage capacity of 4,483 acre-feet. Completed in 1986, the structure is 40 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. The most recent inspection on record was 06/26/2020.
At 46 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Illinois |
| County | Clark |
| Nearest City | Snyder |
| River/Stream | Joes Fork |
| Coordinates | 39.26351, -87.74751 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 46 ft |
| Dam Height | 46 ft |
| Dam Length | 760 ft |
| Year Completed | 1986 (40 years old) |
Storage & Hydraulics
| NID Storage | 4,483 acre-ft |
| Max Storage | 4,483 acre-ft |
| Normal Storage | 385 acre-ft |
| Max Discharge | 6,206 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | MILL CREEK CONSERVANCY DISTRICT |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 06/26/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50011 |
| Federal ID | IL50011 |
| More Info | State Dam Safety Program |