Pennsylvania Route 173

I-80 near Grove City
I-80 near Grove City
North end	PA 27 near Cochranton
Location
Country	United States
State	Pennsylvania
Counties	Butler, Mercer, Crawford
Highway system
	Pennsylvania State Route System; Interstate; US; State; Scenic; Legislative;

Pennsylvania Route 173 (PA 173) is a 45.7-mile-long (73.5 km) state highway located in western Pennsylvania, running from PA Route 8 south of Slippery Rock in Butler County, to PA Route 27 north of Cochranton in Crawford County.

Route description

PA 173 is designated as part of Washington's Trail between its southern terminus at PA Route 8 and Slippery Rock.^[2]

From the village of Stone House at PA Route 8, PA 173 heads north-northeast in Butler County about 4 miles (6.4 km) to the borough of Slippery Rock, home to Slippery Rock University. Near the north end of town, the route intersects with PA 108 at the southern terminus of PA Route 258. Routes 108 and 173 overlap, traveling northeasterly for 0.3 miles (0.48 km), where the concurrency ends and PA 173 turns northward. About 3 miles (4.8 km) later, the route crosses the county line.

After entering

I-80 about 2.5 miles (4.0 km) later, and then intersects with PA Route 965

about 6 miles (9.7 km) after that at the village of Perrine's Corners.

PA 173 enters the borough of

US 62; the concurrency ends at the eastern terminus of PA Route 358. PA 173 leaves the borough, and just over 4 miles (6.4 km) later, intersects with Georgetown Rd., which is the former alignment of PA Route 285 in the borough of New Lebanon

. The route passes through the village of Milledgeville 4 miles (6.4 km) north, and then crosses the county line just over 1 mile (2 km) after that.

A little more than 2 miles (3.2 km) after entering

US 322, and then 0.6 miles (0.97 km) later, after leaving the borough, it intersects with the current alignment of US 322. Not quite 2 miles (3.2 km) later, the route passes through the village of Kasters Corners, and then runs another 5 miles (8.0 km) before its northern terminus at PA Route 27

.

History

In 1926, the segment from Stone House to

PA 78 before receiving the current number in 1961.^[2]

Major intersections

County	Location	mi^[1]	km	Destinations	Notes
Butler	Brady Township	0.0	0.0	PA 8 (William Flinn Highway) – Butler, Franklin	Southern terminus
	Slippery Rock	4.6	7.4	PA 108 west (New Castle Street) / PA 258 north (Main Street)	Southern terminus of PA 108 concurrency; southern terminus of PA 258
	Slippery Rock	4.9	7.9	PA 108 east (Franklin Street)	Northern terminus of PA 108 concurrency
Mercer	Grove City	11.5	18.5	PA 58 east (Main Street)	Southern terminus of PA 58 concurrency
		11.7	18.8	PA 58 west (Main Street) / PA 208 west (Center Street)	Northern terminus of PA 58 concurrency; southern terminus of PA 208 concurrency
		12.5	20.1	PA 208 east (North Street) – Barkeyville	Northern terminus of PA 208 concurrency
	I-80 – Clarion, Sharon	Exit 24 (I-80)
	Worth Township	21.2	34.1	PA 965 (Jackson Center-Polk Road) – Jackson Center, Polk
	Sandy Lake	25.4	40.9	US 62 south (Mercer Road)	Southern terminus of US 62 concurrency
	Sandy Lake	25.6	41.2	I-79	Northern terminus of US 62 concurrency; eastern terminus of PA 358
Crawford	Fairfield Township	37.5	60.4	PA 285 west – Conneaut Lake	Eastern terminus of PA 285
	Wayne Township	38.7	62.3	US 322 (Twenty-eighth Division Highway) – Meadville, Franklin
	Randolph Township	45.7	73.5	PA 27 – Meadville, Titusville	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus