Witherup Bridge is a historic Pratt pony truss bridge located in Clinton Township, Venango County, Pennsylvania. It was built by the Canton Bridge Company in 1906. It measures and crosses the Scrubgrass Creek. It was listed on the National Register of Historic Places in 1988. References Road bridges on the National Register of Historic Places in Pennsylvania Bridges completed in 1906 Truss bridges in the United States Bridges in Venango County, Pennsylvania National Register of Historic Places in Venango County, Pennsylvania 1906 establishments in Pennsylvania