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Interstate 180
Interstate 180
	I-180 highlighted in red
Route information
	Auxiliary route of I-80
	Maintained by PennDOT
Length	28.84 mi (46.41 km)
Existed	January 1984–present
NHS	Entire route
Major junctions
West end	I-99 / US 15 / US 220 in Williamsport
	US 15 in Williamsport; PA 87 in Montoursville; US 220 near Pennsdale; PA 405 near Muncy
East end	I-80 / PA 147 near Milton
Location
Country	United States
State	Pennsylvania
Counties	Lycoming, Northumberland
Highway system
	Interstate Highway System; Main; Auxiliary; Suffixed; Business; Future; Pennsylvania State Route System; Interstate; US; State; Scenic; Legislative;

Interstate 180 (I-180) is a spur highway in Pennsylvania that connects Williamsport to I-80 near Milton. The length of the highway is 28.84 miles (46.41 km). It was also the designation of present-day I-176 between Morgantown and Reading, when the Pennsylvania Turnpike carried the "I-80S" designation in the 1960s. It is signed as an east–west route for its entire length, even though half of the route runs north–south.

Route description

I-180 begins along the banks of the West Branch Susquehanna River in Williamsport, at an interchange with I-99, U.S. Route 15 (US 15), and US 220. The highway begins running concurrently along US 15 and US 220.

At exit 27A, US 15 leaves the overlap running south across the Carl E. Stotz Memorial Little League Bridge, and I-180 continues eastward, still concurrent with US 220 northbound. From there, I-180 runs along the West Branch Susquehanna River until the highway reaches the eastern suburbs of Williamsport, where US 220 leaves the Interstate via exit 15.

From I-99/US 220 to the eastern terminus, I-180 is aligned north–south, though the highway is signed east–west. I-180 terminates at an interchange with I-80, and the freeway continues as Pennsylvania Route 147 (PA 147).

History

I-180 was designated in January 1984 and was signed concurrently with US 220 between US 15 in Williamsport and Pennsdale and replaced PA 147 between US 220 in Pennsdale and I-80 near Milton.^[2]

Exit list

County	Location	mi^[3]	km	Exit	Destinations	Notes
Lycoming	Williamsport	28.84	46.41	–	Future I-99 south / US 220 south – Lock Haven	Continuation south; western end of US 220 concurrency
		28.84	46.41	29	I-99 north / US 15 north – Mansfield	Western end of US 15 concurrency; current southern terminus of I-99
		27.9	44.9	28	Maynard Street	Access to Williamsport Hospital and Pennsylvania College of Technology
		27.7	44.6	27B	Hepburn Street	Eastbound exit and westbound entrance
		26.8	43.1	27A	US 15 south (Market Street) – Lewisburg	Eastern end of US 15 concurrency; access to Little League Museum and Business District
		26.5	42.6	26	Basin Street	Westbound exit and eastbound entrance
	Loyalsock	25.3	40.7	25	Faxon	Sgts. Thomas Woodruff Sr. and Hamilton Woodruff Memorial Interchange; access via Northway Road
	Loyalsock	24.0	38.6	23	Third Street / Warrensville Road – Warrensville, Montoursville	Signed as exits 23A (Third Street) and 23B (Warrensville) eastbound; access to Williamsport Regional Airport and Montoursville
	Montoursville	21.7	34.9	21	PA 87 north (Loyalsock Avenue)	Southern terminus of PA 87; access to Williamsport Regional Airport
	Montoursville	20.4	32.8	20	Fairfield Road
	Muncy Township	16.9	27.2	17	Lycoming Mall Road
	Muncy Township	15.5	24.9	15	US 220 north – Halls, Pennsdale	Eastern end of US 220 concurrency
	Muncy Creek Township	12.8	20.6	13	PA 405 – Muncy, Hughesville	Signed as exits 13A (south) and 13B (north) eastbound
	Muncy Creek Township	10.6	17.1	10	Main Street	Westbound exit and eastbound entrance
Northumberland	Delaware Township	5.6	9.0	5	PA 54 – Turbotville
	Delaware Township	1.1	1.8	1	McEwensville, Watsontown	Access via Susquehanna Trail
	Turbot Township	0.0	0.0	–	I-80 – Bellefonte, Bloomsburg	Exit 212B on I-80
	Turbot Township	0.0	0.0	–	PA 147 south – Milton	Continuation south
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Incomplete access