Interstate 79 (I-79): Charleston to Erie Route, Miles and Safety Data

How long is I-79?

FHWA's Route Log, current as of January 2026, gives I-79 339.94 miles: 160.52 in West Virginia and 179.42 in Pennsylvania. Wikipedia and Interstate Guide both print 343.46 miles, with the same West Virginia figure and 182.94 for Pennsylvania.

The 3.52-mile difference matches the stretch near Washington, Pennsylvania, where I-79 and I-70 run on the same pavement. The Route Log's Pennsylvania row for I-79 carries a note of 3.55 shared miles on I-70, and Wikipedia and Interstate Guide count that shared stretch in I-79's Pennsylvania total.

Where I-79 starts and ends

The southern end is a Y-shaped interchange with I-77 on the northwest bank of the Elk River, just northeast of downtown Charleston. At the north end, I-79 stops about a mile past the US 20 (26th Street) exit in Erie, where the freeway turns into the Bayfront Parkway west of downtown, just past the PA 5 (12th Street) exit. Wikipedia pins the exact end at the at-grade Bayfront Parkway and Lincoln Avenue intersection.

For its first 67 miles the road stays in the Elk River watershed and crosses the river twice, at Frametown and at Sutton. It then runs northeast through Clarksburg, Fairmont and Morgantown. Across the Pennsylvania line it curves west toward Waynesburg and Washington, then turns back east through Canonsburg, Bridgeville and Carnegie, bypassing Pittsburgh, before crossing the Ohio River and heading north past Cranberry Township and Mercer to Erie.

Interstate junctions along I-79

The list reads from Charleston north. I-79 begins at I-77, and in Morgantown it meets the western end of I-68. In Pennsylvania it shares about 3.5 miles with I-70 near Washington, meets the Pennsylvania Turnpike (I-76) at Cranberry Township, crosses I-80 at exit 116 in Findley Township and reaches I-90 in McKean Township. The route into downtown Pittsburgh, I-376, connects at exit 59 near Pennsbury Village; as a three-digit route it is left off the list.

Fatal crashes on I-79

Fatal crashes on I-79 killed 72 people from 2020 to 2024, roughly 14 a year. Per 100 route miles, I-79 averaged 4.2 deaths a year against 9.5 across the Interstate network, which puts it 48th of the 56 routes with a rate. Deaths jumped from 11 in 2020 to 23 in 2021, then dropped to 18 in 2022 and 8 in 2023 before rising to 12 in 2024.

West Virginia had 43 deaths on 160.52 miles, a rate of 5.4. Pennsylvania had 29, a rate of 3.2, figured over the 179.42 miles in its Route Log row; the 3.55 miles shared with I-70 count toward I-70's rate. Kanawha County in West Virginia leads the county list with 10 deaths, and Monongalia County is close behind with 9. On the Pennsylvania side, Butler County had 8, Allegheny 6 and Washington 5.

Counties with the most I-79 crash deaths

Bridges on I-79

I-79's main line passes over 366 bridges counted in the 2025 National Bridge Inventory, with a median build year of 1972. Most, 262, rate Fair, while 71 rate Good and 33 rate Poor, about 9.0 percent. All 33 Poor bridges are in West Virginia, roughly one in five of the state's 168. None of Pennsylvania's 198 bridges on the route rates Poor.

The Neville Island Bridge takes I-79 over the Ohio River about eight miles northwest of Pittsburgh. It opened on September 3, 1976, as the last piece of the road between West Virginia and Erie. Southwest of Morgantown, the Uffington Bridge carries the route over the Monongahela River.

Tolls on I-79

No I-79 facility appears in FHWA's toll inventory of January 2023, and a Charleston to Erie trip pays no tolls. I-79 itself is free, though in Pennsylvania it meets two tolled roads: the Turnpike at Cranberry Township and PA 576, the Southern Beltway, in Cecil Township. No new toll or express lanes on I-79 since then appear in Wikipedia or Interstate Guide. The tolled Pennsylvania Turnpike crosses at Cranberry Township. Drivers used to reach it on PA 228 until PennDOT and the Turnpike Commission built a direct freeway connector, a $44.3 million connector whose last ramps opened in October 2003; the project was formally finished in June 2004.

I-79 auxiliary routes

Both three-digit routes numbered off I-79 are in Pittsburgh. I-279, 13.29 miles long, merges into I-79 at exit 72 in Franklin Park, and I-579 is a 1.55-mile route in the city. The two main numbers once sat the other way around: early plans took I-79 into Pittsburgh on what is now the I-279 Parkway North alignment, with I-279 as the western bypass. The swap was approved on June 29, 1970, and took effect on October 2, 1972. Interstate Guide says through traffic was the reason.

Planning and building I-79

Pennsylvania authorized a Northwestern Extension of its turnpike, from the main line north to Erie, in 1953, and a Southwestern Extension south from near Pittsburgh in 1955. The I-79 number went on the Erie to Pittsburgh corridor in 1958. An extension south along I-70 to Washington and on to Charleston was approved on October 18, 1961.

West Virginia opened its first piece, between exit 125 (Saltwell Road) and exit 132, on December 21, 1967. In Pennsylvania, exits 1 to 14 opened on July 25, 1975, and the Neville Island Bridge followed in 1976. The road reached I-77 in Charleston in 1979, and about one more mile was added in Erie in 1984.

West Virginia calls the road the Jennings Randolph Expressway, and most of the Pennsylvania section is the Raymond P. Shafer Highway. Near milemarker 100 northbound, two ghost ramps built for the 1973 and 1977 Boy Scouts of America National Jamborees at Moraine State Park are still visible under the brush, closed since the 1977 event.

I-79 traffic and road conditions

Most searches for I-79 concern a crash or a closure on the road today. For those, WV511 posts conditions south of the state line, and 511PA covers the rest of the road to Erie.

I-79 questions