Ohio State Route 170

State Route 170
Route information
Maintained by ODOT
Length:	36.64 mi[1] (58.97 km)
Existed:	1924 – present
Major junctions
South end:	US 30/SR 7/SR 11 near Calcutta
	I-680 in Youngstown
North end:	US 62 in Youngstown
Location
Counties:	Mahoning, Columbiana
Highway system
Ohio highways Interstates • U.S. Routes • State Routes ← SR 169 SR 171 →

Intersection with State Route 154 in Negley

State Route 170 (SR 170, OH 170) is a north–south running state route located in Mahoning and Columbiana counties in northeast Ohio. It runs within a few miles of the Pennsylvania border for much of its route as it passes though the eastern parts of the two counties. The southern terminus is at an interchange with U.S. 30, State Route 7, and State Route 11 near Calcutta, and the northern at U.S. 62 in Youngstown. ODOT extended the northern terminus from the previous point of Interstate 680, changing signs on July 16 and 17, 2008.^[2]

History

• 1924 - Original state highway.^[3]
• 1924 - Originally routed from East Palestine to Petersburg.^[3]
• 1931 - Extended to East Liverpool along previous unnumbered road.^[3]
• 1962 - Extended to 1-mile (1.6 km) north of North Kingsville along previous route 90.^[3]
• 1970 - Truncated at 3 miles (4.8 km) north of Poland.^[3]
• 2008 - Extended 3 miles (4.8 km) to U.S. 62 in Youngstown along the former Route 625.^[2][4]

Junctions

County	Location	Mile	Destinations	Notes
Columbiana	Calcutta	0.00	US 30 SR 7 SR 11	Southern terminus US 30/SR 11/SR 7 concurrency crosses north–south at a full interchange. SR 170 heads northeasterly.
	Negley	11.18	SR 154	SR 154 joins from the west for 0.06 mile concurrency.
		11.24	SR 154	SR 154 exits to the east.
	East Palestine	14.57	SR 46 SR 558	SR 46 and SR 558 run to the west. Eastern terminus of SR 558, southern terminus of SR 46.
		14.82	SR 165	SR 165 joins from the east.
	Unity	16.70	SR 14	SR 170 and SR 165 briefly follow SR 14 to the west in Unity.
		17.24	SR 14 SR 165	SR 170 heads to the north while SR 165 veers to the northwest. SR 14 continues to the west.
Mahoning	Petersburg	21.23	SR 617	SR 617 briefly joins from the west.
		21.32	SR 617	SR 617 leaves to the east.
	New Middletown	26.04	SR 630	SR 630 runs to the east (Western terminus).
	Poland	30.33	SR 616	SR 616 heads northeast toward Struthers (Southern terminus).
		30.39	US 224	US 224 crosses east–west.
	Youngstown	33.55	I-680	I-680 crosses north–south at a full interchange. Northern terminus of SR 170 until July 17, 2008.
		35.33	SR 7	SR 7 crosses north–south.
		36.64	US 62	Northern terminus. US 62 crosses east–west.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

1. ^ Ohio Department of Transportation. "Technical Services Straight Line Diagrams". http://www.odotonline.org/techservapps/SLD/default.htm. Retrieved April 30, 2010. 
2. ^ ^{a b} "Sign work, I-680 restrictions to be done today". The Vindicator. 2008-07-17. http://www.vindy.com/news/2008/jul/17/sign-work-i-680-restrictions-to-be-done-today/. Retrieved 2009-05-12. 
3. ^ ^{a b c d e} Route 170 by John Simpson
4. ^ "ODOT SLD: Mahoning County 2008 Updates". Ohio Department of Transportation. January 1, 2008. http://www2.dot.state.oh.us/techservsite/availpro/Road_%20Infor/SLD/updates_2008/MAH.htm. Retrieved 2009-02-18.