The Detroit-Superior High Level Bridge is a combination reinforced-concrete and steel structure with a total length of 2,880 feet. The double-deck bridge was designed to carry four lanes of traffic on the upper roadway and six street railway tracks on the lower deck. The center span over the river was a 591-foot three-hinged steel arch of Pratt truss design. At the time of its completion in 1917, the Detroit-Superior Bridge held the record as the third longest steel arch in the country. The bridge also received attention for its unusual subway approaches beneath the streets at each end of the bridge. The lower streetcar deck was abandoned in 1955.