The Frankstown Branch Juniata River runs north along the west foot of the ridge before turning east along U.S. Route 22 at Water Street, the river, road, and rail (the abandoned Petersburg Branch) crossing the ridge line through a water gap.
The Frankstown Branch Juniata River flows north along the western slope of the ridge before changing direction to the east at Water Street, where it intersects U.S. Route 22 and the Petersburg Branch railway line, crossing over a water gap in the ridge.