Ohio State Route 578
|Maintained by ODOT|
|Length:||0.19 mi (0.31 km)|
|Existed:||1937 – 2012|
|South end:||SR 65 in Grand Rapids|
|North end:||US 24(former) near Grand Rapids|
State Route 578 (SR 578, OH 578) was a short north–south state highway in northwestern Ohio, a U.S. state. In fact, State Route 578 ranked among the shortest state routes in the state, coming in at a length of just 0.19 miles (0.31 km). Its southern terminus was at State Route 65 in Grand Rapids, and its northern terminus was at the former alignment of U.S. Route 24, just across the Maumee River and the Wood-Lucas County Line from Grand Rapids.
Route description 
No sooner than starting from the intersection of State Route 65 and Bridge Street in Grand Rapids, State Route 578 crossed the Maumee River via a two-lane, four-span steel bridge. North of the bridge, State Route 578 met a pair of driveways (one on either side of the roadway), crossed over a very narrow waterway parallel to the Maumee River, and promptly arrived at its endpoint at the former U.S. Route 24.
State Route 578 made its debut in 1937 as a route that was much longer than the short connector that is serves as today. Starting from the Henry County intersection of what is now State Route 108 (then known as State Route 33) and County Road L approximately 4 miles (6.4 km) south of Napoleon, State Route 578 followed what is now County Road L east, passing an intersection with State Route 109 and straddling the northern village limits of Malinta. Continuing east, State Route 578 continued eastward along County Road L, crossing State Route 65 and proceeded to Township Road 1C, which the state route then followed northeasterly to the County Road M intersection, and turned east. Heading into Wood County, State Route 578 followed Sand Ridge Road to Wapakoneta Road (County Road 189), then turned north, and followed Wapakoneta Road past an intersection with U.S. Route 6 and into Grand Rapids. There, State Route 578 ended at what was is now just State Route 65, but was then a duplex between State Route 65 and U.S. Route 24. U.S. Route 24 then crossed over the Maumee River where State Route 578 does today to pick up the routing that it currently occupies today on the north side of the river.
In 1942, U.S. Route 24 was re-routed onto the north side of the Maumee River heading northeast from Napoleon. State Route 578 was then extended into Lucas County to meet U.S. Route 24 on the north side of the Maumee River across from Grand Rapids, via the bridge that formerly carried U.S. Route 24 across the river there. One year later, however, State Route 578 was shortened greatly, when jurisdiction of the route between State Route 108 south of Napoleon and State Route 65 in Grand Rapids was yielded to Henry and Wood Counties. Since then, State Route 578 has simply been the short route across the Maumee River connecting State Route 65 with U.S. Route 24. In August 2012 when US-24 was rerouted, SR-295 was extended to run along the former US-24's alignment until Grand Rapids, where SR-295 then replaced the former SR-578.
Major intersections 
||Grand Rapids||0.00||0.00||SR 65||Southern terminus.|
||Providence Township||0.19||0.31||US 24||Northern terminus.|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Ohio Department of Transportation. "Technical Services Straight Line Diagrams". Retrieved 2009-01-10.
- Federal Highway Administration (December 2003) (PDF). National Highway System: Ohio (Map). http://www.fhwa.dot.gov/planning/nhs/maps/oh/oh_Ohio.pdf. Retrieved 2010-10-26.
- Yahoo! Inc. Yahoo! Maps – overview map of State Route 578 (Map). Cartography by Navteq. http://maps.yahoo.com/#mvt=m&lat=41.414497&lon=-83.860687&zoom=16&q1=41.413121%2C-83.861116&q2=41.415712%2C-83.860333. Retrieved 2009-01-10.
- Yahoo! Inc. Yahoo! Maps – overview map of State Route 578's routing in 1937 (Map). Cartography by Navteq. http://maps.yahoo.com/#mvt=m&lat=41.379906&lon=-83.982609&zoom=12&q1=41.326108%2C-84.118436&q2=41.342413%2C-83.869699&q3=41.411826%2C-83.864056. Retrieved 2009-01-24.
- Ohio Department of Transportation (1936). Ohio State Map (Map). Cartography by Ohio Department of Transportation.
- Ohio Department of Transportation (1937). Ohio State Map (Map). Cartography by Ohio Department of Transportation.
- Ohio Department of Transportation (1941). Ohio State Map (Map). Cartography by Ohio Department of Transportation.
- Ohio Department of Transportation (1942). Ohio State Map (Map). Cartography by Ohio Department of Transportation.
- Ohio Department of Transportation (1944). Ohio State Map (Map). Cartography by Ohio Department of Transportation.