Mill Creek Ws Str 4 is an earth dam located in Clark County, Illinois, built in 1976. It carries a Low hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 460 ft long, taller than 80% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Mill Creek Ws Str 4
The primary purpose of Mill Creek Ws Str 4 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 Cr Conservancy Dist;mill Cr Conservancy Dist (private). It impounds the Tr- Mill Creek E near Walnut Prairie.
The dam stands 35 feet tall and stretches 460 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 707 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1976, the structure is 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. The most recent inspection on record was 06/14/2023.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Illinois |
| County | Clark |
| Nearest City | Walnut Prairie |
| River/Stream | Tr- Mill Creek E |
| Coordinates | 39.38952, -87.72625 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 460 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 707 acre-ft |
| Max Storage | 707 acre-ft |
| Normal Storage | 78 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 4,028 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Mill Cr Conservancy Dist;mill Cr Conservancy Dist |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/14/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL40011 |
| Federal ID | IL40011 |
| More Info | State Dam Safety Program |