Marissa Reservoir Dam
Marissa Reservoir Dam is an earth dam located in St. Clair County, Illinois, built in 1938. It carries a Significant hazard potential classification.
About Marissa Reservoir Dam
The primary purpose of Marissa Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Village Of Marissa (local government). It impounds the Trib Mud Creek near New Athens.
The dam stands 22 feet tall and stretches 400 feet across, and has a maximum storage capacity of 134 acre-feet. Completed in 1938, the structure is well-established, with more than 75 years of service.
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 | New Athens |
| River/Stream | Trib Mud Creek |
| Coordinates | 38.25517, -89.72951 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 400 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 134 acre-ft |
| Max Storage | 134 acre-ft |
| Normal Storage | 90 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | VILLAGE OF MARISSA |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 07/30/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00374 |
| Federal ID | IL00374 |
| More Info | State Dam Safety Program |