South of St. Marys, the Quehanna Trail is a 75 mile mountain bike loop that starts from Parker Dam State park and runs through both Elk and Moshannon State Forests. The route passes through some wild, scenic, and challenging terrain.
The main orange blazed trail begins on the western end at Parker Dam State Park. From Parker Dam the trail goes east into the Quehanna Wild Area toward Karthaus and Piper, then north toward Sinnemahoning and finally west through the Marion Brooks Natural Area back to Parker Dam.
There are two blue blazed cross-connector trails and numerous blue blazed side trails that add another 30 miles of trails so that the casual or avid hiker may spend a few hours or a few days enjoying the beauty of the Quehanna Wild Area. These additional 30 miles of blue blazed trails helps hikers to fashion shorter circuit hikes and enjoy many beautiful sights off the main orange trail.
To reach mountain biking at the trailhead near the Forest HQ from the intersection of US 322 and US 220 in State College, go north on US 220 for 12.5 miles. Go west on I-80 for 27 miles. Go north on SR 1011 for 13 miles to Karthaus. Continue north on 1011 for 10 more miles. Veer left on SR 2004 (Quehanna Hwy) and go 7miles to the Forest Headquarters.
Overall, Quehanna Trail is the 18th most popular mountain bike trail of all 75 mountain biking rides in Pennsylvania.