Roodhouse Lake Dam is an earth dam located in Greene County, Illinois, built in 1974. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 495 ft long, taller than 55% 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 Roodhouse Lake Dam
The primary purpose of Roodhouse Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Roodhouse (local government). It impounds the Trib Wolf Run near Berdan-offstream.
The dam stands 26 feet tall and stretches 495 feet across, and has a maximum storage capacity of 191 acre-feet. Completed in 1974, the structure is well into its service life at over 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 08/22/2025.
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Location
| State | Illinois |
| County | Greene |
| Nearest City | Berdan-offstream |
| River/Stream | Trib Wolf Run |
| Coordinates | 39.46289, -90.36525 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 495 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 191 acre-ft |
| Max Storage | 191 acre-ft |
| Normal Storage | 142 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Roodhouse |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/22/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01027 |
| Federal ID | IL01027 |
| More Info | State Dam Safety Program |