Drivers were crossing the Knox Bridge after it reopened at 9 a.m. Friday.
It had been closed since someone, who remains at large, slammed into the historic bridge.
When PennDOT repaired it, Tredyffrin Township launched a $17 million project to shore up a major sewer line.
A few years ago, millions of gallons of raw waste leaked into Valley Creek, so thick heavy plastic was used to relive the 30-inch concrete main which services some 70,000 customers in multiple surrounding townships.