Ohio State Route 378

State Route 378
Route information
Maintained by ODOT
Length:	9.46 mi[1] (15.22 km)
Existed:	1935 – present
Major junctions
South end:	SR 243 near Willow Wood
North end:	SR 141 near Willow Wood
Location
Counties:	Lawrence
Highway system
Ohio highways Interstates • U.S. Routes • State Routes ← SR 377 SR 379 →

State Route 378 (SR 378, OH 378) is a north–south state highway in the south-central portion of Ohio. State Route 378's southern terminus is at State Route 243 about 5 miles (8.0 km) south of the unincorporated community of Willow Wood. Its northern terminus is at State Route 141 nearly 4 miles (6.4 km) northwest of Willow Wood.

Created in the mid 1930s, and existing entirely in Lawrence County, State Route 378 parallels Symmes Creek for its entire length. A part of the northern segment of the state highway runs through a small section of Wayne National Forest.

Route description

All of State Route 378 is located within Lawrence County. The highway is inclusded as a part of the National Highway System, a system of highways deemed most important for the country's economy, mobility and defense.^[2]

History

When it made its debut in 1935, State Route 378 existed just in the form of its current northern 4 miles (6.4 km) segment between State Route 217 and State Route 141.^[3][4] Two years later, State Route 378 would take on its current look when it was extended via a short concurrency with State Route 217 heading east, then onto its current southern stretch to a junction with State Route 243. Since that extension, there have been no other significant changes to the routing of State Route 378.^[5][6]

Major intersections

The entire route is in Lawrence County.

Location	Mile[1]	Destinations	Notes
Union Township	0.00	SR 243	Southern terminus.
Windsor Township	4.95	SR 217 east	T-intersection marking eastern split of SR 217/SR 378 duplex. SR 217 joins from the east.
	5.54	SR 217 west	T-intersection marking western split of SR 217/SR 378 duplex. SR 217 departs to the west.
Aid Township	9.46	SR 141	Northern terminus.
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. "Technical Services Straight Line Diagrams". http://www.odotonline.org/techservapps/SLD/default.htm. Retrieved 2010-09-04. 
2. ^ Federal Highway Administration (December 2003) (PDF). National Highway System: Ohio (Map). http://www.fhwa.dot.gov/planning/nhs/maps/oh/oh_Ohio.pdf. Retrieved 2010-09-04. 
3. ^ Ohio Department of Transportation (1934). Ohio State Map (Map). 
4. ^ Ohio Department of Transportation (1935). Ohio State Map (Map). 
5. ^ Ohio Department of Transportation (1936). Ohio State Map (Map). 
6. ^ Ohio Department of Transportation (1937). Ohio State Map (Map).