I love covered bridges, probably because my great-grandmother lived just downriver from one when I was growing up. We were never allowed to get too close - it still was used for traffic - but I can remember many times walking to where her street dead-ended into the Doe River and watching the water and the ducks flowing under the bridge.
So when I found an online site that listed all the covered bridges in PA - and there are a LOT - I knew we were going to go bridge hunting.
Knox Bridge, Valley Forge, built in 1868.
Rapp's Dam Bridge, Phoenixville, built in 1866. (Poor sad little bridge)
Kennedy Bridge, Phoenixville, built in 1856.
Hall-Sheeder Bridge, Bucktown, built in 1850.