Coffeen Station Coal Yard Pond Dam is an earth dam located in Montgomery County, Illinois, built in 1979. It carries a Significant hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 600 ft long. 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 Coffeen Station Coal Yard Pond Dam
Coffeen Station Coal Yard Pond Dam is a dam in Montgomery, Illinois. The dam is owned by Illinois Power Generating Company (private). It impounds the Trib Lake Coffeen.
The dam stands 20 feet tall and stretches 600 feet across, and has a maximum storage capacity of 45 acre-feet. Completed in 1979, the structure is 47 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 09/17/2025.
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Location
| State | Illinois |
| County | Montgomery |
| River/Stream | Trib Lake Coffeen |
| Coordinates | 39.05442, -89.40464 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 600 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 45 acre-ft |
| Max Storage | 45 acre-ft |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Other |
| Owner | Illinois Power Generating Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 09/17/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50728 |
| Federal ID | IL50728 |
| More Info | State Dam Safety Program |