Ravenwood Lake Dam is an earth dam located in St. Clair County, Illinois, built in 1990. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 270 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 Ravenwood Lake Dam
The primary purpose of Ravenwood Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ravenwood Lake Association (private). It impounds the Trib Richland Creek near O'fallon.
The dam stands 15 feet tall and stretches 270 feet across, and has a maximum storage capacity of 250 acre-feet. Completed in 1990, the structure is 36 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 04/18/2023.
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Location
| State | Illinois |
| County | St. Clair |
| Nearest City | O'fallon |
| River/Stream | Trib Richland Creek |
| Coordinates | 38.55629, -89.95419 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 270 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Normal Storage | 79 acre-ft |
| Max Discharge | 931 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Ravenwood Lake Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 04/18/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50149 |
| Federal ID | IL50149 |
| More Info | State Dam Safety Program |