Coulterville Coal/gateway Mine/slurry Cell 2 Dam is an earth dam located in Randolph County, Illinois, built in 1986. It carries a Significant hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 7,200 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 Coulterville Coal/gateway Mine/slurry Cell 2 Dam
Coulterville Coal/gateway Mine/slurry Cell 2 Dam is a dam in Randolph, Illinois. The dam is owned by Coulterville Coal Company, LLC (private). It impounds the Trib Marys River near Coulterville.
The dam stands 35 feet tall and stretches 7,200 feet across, and has a maximum storage capacity of 2,020 acre-feet. Completed in 1986, the structure is 40 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 09/20/2024.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Illinois |
| County | Randolph |
| Nearest City | Coulterville |
| River/Stream | Trib Marys River |
| Coordinates | 38.17039, -89.63578 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 7,200 ft |
| Year Completed | 1986 (40 years old) |
Storage & Hydraulics
| NID Storage | 2,020 acre-ft |
| Max Storage | 2,020 acre-ft |
| Normal Storage | 1,720 acre-ft |
| Max Discharge | 47 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Coulterville Coal Company, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 09/20/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50167 |
| Federal ID | IL50167 |
| More Info | State Dam Safety Program |