Coulterville Coal/gateway Mine/slurry Cell 3 Dam is an earth dam located in Randolph County, Illinois, built in 1990. It carries a High hazard potential classification.
Dam profile
NID height · 41 ft41 ft tall and 7,400 ft long, taller than 87% 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 3 Dam
Coulterville Coal/gateway Mine/slurry Cell 3 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 41 feet tall and stretches 7,400 feet across, and has a maximum storage capacity of 6,000 acre-feet. Completed in 1990, the structure is 36 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 09/04/2024.
At 41 feet, this dam is taller than 87% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Illinois dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Randolph |
| Nearest City | Coulterville |
| River/Stream | Trib Marys River |
| Coordinates | 38.18209, -89.63909 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 7,400 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 6,000 acre-ft |
| Max Storage | 6,000 acre-ft |
| Max Discharge | 20 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Coulterville Coal Company, LLC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 09/04/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50115 |
| Federal ID | IL50115 |
| More Info | State Dam Safety Program |