County Bridge No. 54 is a historic stone arch bridge located near Prospectville in Whitemarsh Township, Montgomery County, Pennsylvania. The bridge was built in 1841 and rebuilt in 1916. It has three 28-foot-long (8.5 m) spans with an overall length of 125-foot (38 m). The bridge crosses a branch of Wissahickon Creek.

It was listed on the National Register of Historic Places in 1988.