38-09-P1 Bucks County, Ralph Stover Bridge (Boxed Pony)
This is obviously not a true covered bridge, but it's listed on many covered bridge databases. Located in the southern end of Ralph Stover State Park, Tinicum Township, on Stump Rd at the intersection with State Park Rd.
N40 26.096 W75 05.826
Take a look at Motor Mills.org. Historically, Motor Mill had what was known as a "walled Covered Bridge" ; the walls were covered with a roof similar to the roof on The Ralph Stover Bridge, especially take note of the 2 pen and ink drawings done by an Maryland artist showing the Walled & covered Bridge at Motor.