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| State Route 571 (Ohio) | |
|---|---|
| State | OH |
| Type | SR |
| Route | 571 |
| Length mi | 61.54 |
| Established | 1937 |
| Direction a | West |
| Terminus a | Union City |
| Direction b | East |
| Terminus b | U.S. Route 23 near New Carlisle |
| Counties | Darke County, Miami County, Champaign County |
State Route 571 (Ohio) is an east–west state highway in western and west-central Ohio that links Interstate 70 and several regional corridors between Union City and the U.S. Route 23 near New Carlisle. The route traverses portions of Darke County, Miami County, and Champaign County and connects communities that include Ansonia, Piqua, Troy, and Urbana. It functions as a regional arterial facilitating local commerce, commuter movement, and access to interstates such as Interstate 75 and Interstate 70.
State Route 571 begins at the Ohio–Indiana border adjacent to Union City, Indiana and proceeds eastward through the village of Ansonia, intersecting county and township routes that tie into Darke County agricultural districts and the Great Miami River. Continuing, the highway enters Miami County and reaches Piqua, where it intersects local arterials near the confluence of Great Miami River corridors and industrial zones associated with Armstrong Air & Space Museum-adjacent facilities and commuter links to Interstate 75. East of Piqua the route runs toward Troy, intersecting with state and county roads that serve suburban developments, county facilities, and rail corridors tied to Norfolk Southern Railway. Past Troy, the highway continues through rural Champaign County toward Urbana, where it connects with routes that lead to Ohio Northern University-linked networks, before terminating near New Carlisle at U.S. Route 23, providing access to Interstate 70 and longer-distance travel toward Dayton and Columbus.
The corridor was designated in the 1930s as part of Ohio's expansion of numbered state routes during the era of New Deal infrastructure investment and increasing automobile adoption influenced by manufacturers such as Ford Motor Company and General Motors. Initial numbering and alignments were adjusted in coordination with neighboring state systems, including links to Indiana State Road 28 and cross-border commerce with Union City, Indiana. Mid‑20th century improvements paralleled regional investment patterns similar to projects associated with Federal Aid Highway Act of 1956-era planning, aligning SR 571 with connectors to Interstate 75 and later interchange modifications near Troy and Piqua. Maintenance and resurfacing programs undertaken by the Ohio Department of Transportation reflect standards promulgated in guidelines used by organizations such as the American Association of State Highway and Transportation Officials and mirror corridor upgrades seen on contemporaneous routes like U.S. Route 40 and State Route 48.
The route's principal junctions include the western terminus at the Ohio–Indiana border adjacent to U.S. Route 36-linked corridors, an intersection with State Route 49 near Ansonia, crossings of county roads serving Darke County and Miami County agricultural areas, a major concurrency or crossing with State Route 66 in Piqua providing access toward Interstate 75, junctions near Troy that connect to State Route 55 and local arterials, and the eastern terminus at U.S. Route 23 close to New Carlisle with onward links to Interstate 70 and regional networks serving Dayton and Springfield.
Traffic volumes on the highway vary by segment, with urbanized sections near Piqua and Troy showing higher daily vehicle counts attributable to commuter flows to Interstate 75 employment centers and retail districts tied to firms such as Walmart and regional health systems like Miami Valley Hospital. Rural stretches in Darke County and Champaign County exhibit lower average daily traffic consistent with agricultural freight patterns connected to grain elevators, farm equipment dealers, and distribution points serving companies such as Archer Daniels Midland and local cooperatives. Seasonal variations reflect probabilistic increases during events at venues like county fairs, sporting events at Tippecanoe High School-area fields, and tourism to museums including the Armstrong Air & Space Museum.
Planned improvements managed by the Ohio Department of Transportation include pavement rehabilitation, shoulder widening, and intersection safety enhancements consistent with objectives championed by agencies such as the Federal Highway Administration and aligned with funding streams like the Infrastructure Investment and Jobs Act. Local governments in Miami County and Champaign County have proposed corridor studies to evaluate multimodal accommodations, bicycle and pedestrian facilities mirroring projects in Dayton and Columbus, and targeted interchange work to improve access to Interstate 75 and U.S. Route 23. Preservation and modernization efforts are likely to consider freight movements tied to Norfolk Southern Railway transload sites and economic development initiatives promoted by regional bodies such as the Miami Valley Regional Planning Commission and Champaign County Economic Development Corporation.