Ohio State Route 550

State Route 550
Route information
Maintained by ODOT
Length:	40.58 mi[3] (65.31 km)
Existed:	1975[1][2] – present
Major junctions
West end:	US 33 near Athens
East end:	SR 7 near Marietta
Location
Counties:	Athens, Washington
Highway system
Ohio highways Interstates • U.S. Routes • State Routes ← SR 547 SR 551 →

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.

Route description

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.^[4]

History

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.^[1][2] At least part of the route of 550 is based on the original Marietta-Chillicothe Stagecoach Road.

Major intersections

County	Location	Mile[3]	Destinations	Notes
Athens	Athens Township	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	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	SR 690 south	Y-intersection marking northern terminus of SR 690.
	Amesville	10.66	SR 329 north	T-intersection marking western split of SR 329/SR 550 duplex. SR 329 joins from the north.
	Bern Township	12.13	SR 329 south	T-intersection marking eastern split of SR 329/SR 550 duplex. SR 329 departs to the south.
		14.69	SR 377 north	Southern terminus of SR 377.
Washington	Wesley Township	20.56	SR 555
	Barlow Township	29.25	SR 339	Four-way stop intersection with flashing beacon.
	Warren Township	40.58	SR 7	Eastern terminus at interchange.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi      Concurrency terminus •      Closed/Former •      Incomplete access •      Unopened

References

1. ^ ^{a b} 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. 
2. ^ ^{a b} 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. 
3. ^ ^{a b} Ohio Department of Transportation. "Technical Services Straight Line Diagrams". http://www.odotonline.org/techservapps/SLD/default.htm. Retrieved 2011-01-06. 
4. ^ 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.