Marissa Recreation Association South Lake Dam is an earth dam located in St. Clair County, Illinois, built in 1954. It carries a Significant hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 540 ft long, taller than 74% 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 Marissa Recreation Association South Lake Dam
The primary purpose of Marissa Recreation Association South Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Marissa Recreational Area Association (private). It impounds the Trib MUD Creek near Marissa-offstream.
The dam stands 32 feet tall and stretches 540 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 313 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1954, the structure is well into its service life at over 50 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. The most recent inspection on record was 07/30/2024.
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Location
| State | Illinois |
| County | St. Clair |
| Nearest City | Marissa-offstream |
| River/Stream | Trib MUD Creek |
| Coordinates | 38.23445, -89.72475 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 540 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 313 acre-ft |
| Max Storage | 313 acre-ft |
| Normal Storage | 187 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 230 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Marissa Recreational Area Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/30/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00377 |
| Federal ID | IL00377 |
| More Info | State Dam Safety Program |