Railroad, an electric interurban streetcar that operated until 1938. Part of the right-of-way was converted to the Wright-Lockland Highway (now part of Interstate 75). From 1920 to 1925, six million dollars was spent to use the bed of the canal to build a downtown subway in Cincinnati. The surface was later paved over to form Central Parkway, as funds ran out before the Cincinnati Subway could be completed. In the central and northern regions, a large portion of the canal was destroyed when it was filled in to create parts of I-75, U.S. Route 24, and State Route 25. Some smaller portions of right-of-way have been converted to bike trails for recreational and local commuting use. Legacy Although urban development has destroyed most vestiges of the canal, some locks and sections of the waterway have survived. One of the original locks (#17) is located in the Carillon Historical Park in Dayton. An unrestored but complete lock (#15) is located just off Main Street (State Route 571) in Tipp City. Remains of the Excello lock are located in the Butler County Excello Locks Park near the intersection of State Route 73 and South Hamilton Middletown Road in Lemon Township. The massive west abutment of the Old Nine-mile Aqueduct over the Great Miami River is still present approximately upstream of the Taylorsville Dam east of Vandalia (Montgomery County). The abutment terminates a fairly intact canal segment that extends at least north to Tipp City. This segment includes an intact concrete weir near the abandoned Vandalia water treatment plant (aka "Tadmore Station") and a ruined lock (#16, "Picayune") about halfway to Tipp City along Canal Road. On the canal's southern end, a drained section is located in St. Bernard, Ohio's Ludlow Park, where the canal bed is still visible. The canal remains in water (and navigable for canoes or kayaks) in the rural region between Delphos and St. Marys, Ohio. South of St. Mary's, it has degraded to form a shallow ditch in most places, with some ruined locks remaining. From north to south along State Route 66, sections of the original canal are visible in Delphos, at a small historic park located at the Deep Cut in Spencerville, Lock Two (a hamlet mostly consisting of period brick buildings), New Bremen, Minster, Fort Loramie, and Piqua. The Miami and Erie Canal Deep Cut was designated in 1964 as a U.S. National Historic Landmark