Coles Lake Dam is an earth dam located in Greene County, Illinois, built in 1923. It carries a Low hazard potential classification.
Dam profile
NID height · 22 ft22 ft tall and 302 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 Coles Lake Dam
The primary purpose of Coles Lake Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Dale Cole (private). It impounds the Trib Rubicon Creek near Rockbridge.
The dam stands 22 feet tall and stretches 302 feet across, and has a maximum storage capacity of 84 acre-feet. Completed in 1923, the structure is over a century 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 08/27/2025.
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Location
| State | Illinois |
| County | Greene |
| Nearest City | Rockbridge |
| River/Stream | Trib Rubicon Creek |
| Coordinates | 39.33223, -90.19457 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 302 ft |
| Year Completed | 1923 (103 years old) |
Storage & Hydraulics
| NID Storage | 84 acre-ft |
| Max Storage | 84 acre-ft |
| Normal Storage | 52 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Dale Cole |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/27/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00887 |
| Federal ID | IL00887 |
| More Info | State Dam Safety Program |