Big Walnut Creek is a significant waterway in central Ohio, originating north of Hoover Reservoir and flowing southward for approximately 37.6 miles before joining the Scioto River. This gentle stream drops about 148 feet in elevation along its course, averaging a gradient of 3.9 feet per mile. The creek offers diverse paddling opportunities suitable for beginners to intermediate paddlers. Most sections are classified as flatwater to Class I, with occasional mild riffles.

Popular paddling routes include the stretch from Pizzuro Park to Big Walnut Park in Columbus, a 5-6 mile journey typically completed in about 2.5 hours. Another notable section runs from below Hoover Dam to Cherry Bottom Park, providing a scenic 1.5-2 mile one-way trip. The city of Gahanna offers several access points, including Morse Road Kayak launch, Woodside Green Park, and Friendship Park. These allow for customizable trips, such as the 2.5-mile float from Woodside Green to Friendship Park. Seasonal paddle boat and kayak rentals are available at Creekside Park in Gahanna.

Big Walnut Creek's ecosystem supports diverse wildlife, with paddlers often spotting deer and various bird species. The surrounding landscape transitions from urban areas near Columbus to more natural settings as the creek flows southward.

Water levels fluctuate seasonally, with late spring to early fall generally offering the best paddling conditions. However, during drought periods, particularly in July and August, shallow areas may require occasional portaging.

For longer adventures, the creek offers an extensive 74-mile journey from Ruffner Park to Hamilton Township Park, suitable for multi-day trips with ample fishing and camping opportunities along the route.

Safety considerations include checking water levels before trips, as low water can create obstacles. Paddlers should also be aware of potential strainers and log jams, especially after heavy rains.

Big Walnut Creek plays a vital role in central Ohio's watershed, providing recreational opportunities while serving as an important water source for the region. Its course through both urban and natural areas offers paddlers a unique perspective on the interplay between human development and natural ecosystems in the heart of Ohio.