Frehn Bridge, also known as Huntingdon County Bridge No. 1, was a historic Pratt truss bridge spanning Sideling Hill Creek and located at Springfield Township, Huntingdon County, Pennsylvania. It was built in 1890, and measured 120-foot-long (37 m) in length and had a 13.75-foot-wide (4.19 m) timber deck.

It was added to the National Register of Historic Places in 1990.

The bridge has been demolished and replaced with a modern structure.