Colwell Cut Viaduct

Colwell Cut Viaduct, also known as Hogback Hill Bridge, is a historic concrete arch bridge located at Mahoning Township in Armstrong County, Pennsylvania. It was built in 1922, and is a 220 ft three-span bridge, with a 128 ft main span. It crosses the Pittsburg and Shawmut Railroad.

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