The Monongahela Incline is a funicular located near the Smithfield Street Bridge in Pittsburgh, Pennsylvania. Designed and built by Prussian-born engineer John Endres in 1870, it is the oldest continuously operating funicular in the United States. It was listed on the National Register of Historic Places in 1974. In 1977 both inclines were designated as Historic Mechanical Engineering Landmarks by the American Society of Mechanical Engineers (ASME).