The Ohanapecosh River Valley seen from the Naches Peak Loop Trail near Tipsoo Lake. Steve Redman. Box Canyon - Located on Stevens Canyon Road 12 miles (19 km) west of Ohanapecosh. From the bridge, gaze 180 feet (55 meters) below at water rushing through a narrow slot canyon carved by the Muddy Fork of the Cowlitz River. Services. The Ohanapecosh Visitor Center, open from June to early October, offers exhibits, guided interpretive programs, and book sales. NOTE: Many facilities are closed or have limited hours due to COVID-19 health precautions. Learn more about the park's response in the COVID-19 Visitor Guide for Healthy Access. Camping. The Ohanapecosh Campground and picnic area is located on the banks of the peaceful Ohanapecosh River, within a majestic old-growth forest. Like the visitor center, the campground is open from late May to early October.