The Rocky River is a 12-mile tributary of Lake Erie located entirely within Cuyahoga County, Ohio. The river forms at the confluence of its East and West Branches in North Olmsted, with the East Branch extending 35 miles from headwaters in Broadview Heights and the West Branch stretching 36 miles from Montville Township in Medina County. A North Branch also exists, originating in Granger Township before joining the West Branch. The entire watershed encompasses approximately 294 square miles across portions of Cuyahoga, Lorain, Medina, and Summit counties.

The main stem flows northward through eight municipalities—North Olmsted, Brook Park, Cleveland, Fairview Park, Lakewood, and Rocky River—before emptying into Lake Erie between Lakewood and Rocky River. The river carves a dramatic gorge through soft shale formations, creating cliffs that reach heights of 150 feet in some locations. These massive shale walls rise above dense floodplain vegetation including willows, sycamores, and cottonwoods, giving the valley its distinctive character.

Paddling opportunities on the Rocky River are concentrated in its lower reaches within the Cleveland Metroparks' Rocky River Reservation, which protects over 2,500 acres along the river corridor. The Scenic Park Boat Launch at 1500 Scenic Park Drive in Lakewood serves as the primary access point for two distinct paddling experiences. The first is a calm flatwater paddle exploring the lower river's protected waters within the reservation—an out-and-back route ideal for recreational paddlers. The second is a more ambitious 14-mile round-trip journey that ventures from the river mouth onto Lake Erie to reach the Cleveland Water Crib, located 6 miles offshore. This unique trip requires careful assessment of lake conditions and boat traffic, particularly at the river mouth where turbulence and bottlenecked vessel traffic demand caution.

The Rocky River Reservation, established with the first land purchase for Cleveland Metroparks in April 1919, is the most visited of the system's 16 reservations. The 12-mile Valley Parkway follows the river's winding course through the entire reservation, providing scenic views of the gorge. Summer through early fall represents the prime paddling season, with March through October generally accessible for water activities.

The Emerald Necklace Marina, located within the reservation, offers comprehensive services including kayak and paddleboard rentals through commercial outfitters. An accessible kayak launch is available at Scenic Park when conditions permit. Paddlers should note that while the lower river maintains calm conditions, the mouth area requires experienced judgment due to converging currents and heavy boat traffic during peak seasons.