Mill Creek is a 6.6-mile-long (10.6 km)[1] tributary of the Schuylkill River in Lower Merion Township, Montgomery County, Pennsylvania, United States.
The south branch arises near Ardmore, and has Trout Run as a major tributary.
The two branches merge near the intersection of Old Gulph Road and Mill Creek Road, and the lower creek flows east to join the Schuylkill River just upstream of the Gladwyne interchange of the Schuylkill Expressway (Interstate 76 exit 337) and the Flat Rock Dam.
The ford has a gate, which is frequently closed when high water makes crossing it dangerous.
Creek Chubbs are commonly found, and they share the water with Snapping Turtles, salamanders, and crayfish.