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Three Rivers Marina is a private facility located at mile marker 275 on the Illinois River in Wilmington, Will County. The marina offers boat launch services, rentals, and slips for recreational boaters. Note that this is a **private marina and not open to the public**—contact the facility directly at 25400 Desplaines River Road, Wilmington, IL 60481 to confirm access availability and any associated fees or requirements.
The Illinois River at this location is a major waterway (stream order 9) with significant flow averaging over 27,000 cubic feet per second and average velocity of 4.3 feet/second, making it suitable for motorboats, canoes, and kayaks. The river has a gentle gradient (0.3 ft/mile) along its 273-mile course. Nearby, paddlers can visit the Illinois Waterway Visitor Center to learn about lock and dam operations, and the expansive Midewin National Tallgrass Prairie offers additional recreational opportunities in the region.