Ohio State Route 550
|Maintained by ODOT|
|Length:||40.58 mi (65.31 km)|
|Existed:||1975 – present|
|West end:||US 33 near Athens|
|East end:||SR 7 near Marietta|
State Route 550 (SR 550, OH 550) is an east–west state highway in the southeastern portion of the U.S. state of Ohio. The western terminus of State Route 550 is at an interchange with U.S. Route 33 just north of the city limits of Athens, immediately south of the southern terminus of State Route 13. The eastern terminus of State Route 550 is at an interchange with State Route 7 just west of Marietta.
Along its way, State Route 550 passes through the counties of Athens and Washington. There is no section of the highway that is incorporated within the National Highway System, a system of routes deemed most important for the country's economy, mobility and defense.
|This section requires expansion. (January 2011)|
The debut of State Route 550 took place in 1976. This designation was applied to the route that was known as Alternate U.S. Route 50 up until that year, running between U.S. Route 33 just north of Athens and State Route 7 just west of Marietta. No major changes have taken place to the routing of State Route 550 since its inception. At least part of the route of 550 is based on the original Marietta-Chillicothe Stagecoach Road.
||Athens Township||0.00||0.00||US 33||Western terminus at four-ramp interchange, featuring parclo-A ramps on the south side and diamond ramps on the north side.|
|0.38||0.61||SR 13 north||Southern terminus of SR 13, in line with point where ramp from US 33 northbound meets SR 550.|
|Ames Township||10.23||16.46||SR 690 south||Y-intersection marking northern terminus of SR 690.|
|Amesville||10.66||17.16||SR 329 north||T-intersection marking western split of SR 329/SR 550 duplex.
SR 329 joins from the north.
|Bern Township||12.13||19.52||SR 329 south||T-intersection marking eastern split of SR 329/SR 550 duplex.
SR 329 departs to the south.
|14.69||23.64||SR 377 north||Southern terminus of SR 377.|
||Wesley Township||20.56||33.09||SR 555|
|Barlow Township||29.25||47.07||SR 339||Four-way stop intersection with flashing beacon.|
|Warren Township||40.58||65.31||SR 7||Eastern terminus at interchange.|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- Ohio Department of Transportation (1975) (MrSID). Ohio Transportation Map (Map). Cartography by ODOT. http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1975a.sid. Retrieved 2011-01-07.
- Ohio Department of Transportation (1976) (MrSID). Official Ohio Highway Map (Map). Cartography by ODOT. http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1976a.sid. Retrieved 2011-01-07.
- Ohio Department of Transportation. "Technical Services Straight Line Diagrams". Retrieved 2011-01-06.
- Federal Highway Administration (December 2003) (PDF). National Highway System: Ohio (Map). http://www.fhwa.dot.gov/planning/nhs/maps/oh/oh_Ohio.pdf. Retrieved 2011-01-08.