Interstate 80 (I-80): Route, States, Length and Crash Data

How long is I-80?

The FHWA Route Log credits I-80 with 2,891.59 miles as of January 2026, the most of any Interstate. It leads because of how the log handles shared pavement. When two routes use the same lanes, the log books those miles to one of them, and on the Indiana Toll Road and the Ohio Turnpike it books them to I-80: 135.6 miles in Indiana and 142.80 in Ohio. I-90 rides those same lanes, but its rows show just 20.75 miles in Indiana and 102.1 in Ohio.

Measured from end to end, I-90 is the longer road. Wikipedia gives I-90 3,099.74 miles from Seattle to Boston and I-80 2,900.76, which makes I-80 second. Shift the 278.40 shared miles to I-90 and the Route Log order flips as well, with I-90 at 2,984.39 miles and I-80 at 2,613.19.

The 2,900.76 figure that Wikipedia and Interstate Guide print runs about 9 miles above the federal total. The biggest state gap is Iowa, where the log shows 293.52 miles and Interstate Guide 303.23. Nebraska holds the most I-80 mileage, 455.18 miles, ahead of Nevada at 410.46 and Wyoming at 402.59. New Jersey has the least at 68.56.

Where I-80 starts and ends

The western end is US 101 in San Francisco, where I-80 heads onto the Bay Bridge toward Oakland; federal records place it at the bridge's western approach instead. The eastern end is I-95 in Teaneck, New Jersey, about four miles west of the Hudson River.

Along the way it serves Oakland, Sacramento, Reno, Salt Lake City, Cheyenne, Omaha, Des Moines and Toledo, and it passes within 10 miles of Chicago and Cleveland. West of the Great Salt Lake it crosses the Bonneville Salt Flats, where 37.4 miles separate the Wendover and Knolls exits, the longest gap between exits on any Interstate. The high point is Sherman Summit between Laramie and Cheyenne at 8,640 feet. In the Sierra Nevada, Donner Summit sits at 7,239 feet westbound.

Interstate junctions along I-80

Crossings are listed from California east to New Jersey. Nevada's 410.46 miles meet no other main Interstate, and more than half the entries fall in Illinois, Indiana and Ohio. I-90 appears twice because it joins I-80 in Indiana and leaves it in Ohio, and I-94 appears twice for the expressways the two share in Illinois and Indiana. The two I-76 entries are separate roads: one leaves I-80 in western Nebraska for Denver, and the other is the Ohio route through Akron. Around Des Moines, I-80 also shares 14.29 miles with I-35.

Fatal crashes on I-80

Crashes on the I-80 mainline killed 1,035 people from 2020 to 2024, about 207 a year. Spread over the route, that comes to 7.1 deaths a year for every 100 route miles, below the 9.5 Interstate average and 31st among the 56 routes long enough to rank. The yearly count stayed between 214 and 221 through 2023, then dropped to 161 in 2024.

California's 203.08 miles are 7 percent of the route but account for 238 of the deaths, a rate of 23.4. Solano and Contra Costa counties, between Oakland and Sacramento, had the two highest county totals at 69 and 43. New Jersey's 68.56 miles rank next at 14.9. Rates from Nevada through Nebraska run 4.7 to 4.9, with Wyoming lowest on the route at 4.7. Washoe County around Reno and Sweetwater County in Wyoming are third and fourth for deaths, and Lake County, Indiana, is fifth with 36.

Counties with the most I-80 crash deaths

Bridges on I-80

The 2025 National Bridge Inventory counts 2,137 bridges carrying the I-80 main line, and half were built in 1965 or earlier. Wyoming has the most, 334. Seventy-seven rate Poor, about 3.6 percent of the total. California has the most Poor ratings with 19, followed by Illinois with 17 and Wyoming with 16, and Illinois has the highest share, 17 of its 149. Indiana shows only 29 because the inventory files bridges on the Indiana Toll Road, which I-80 shares with I-90, under I-90.

On the Bay Bridge, a replacement eastern span between Yerba Buena Island and Oakland opened on September 2, 2013, at an estimated cost of $6.4 billion. In southwest Wyoming, I-80 runs through the twin bores of the Green River Tunnel between exits 89 and 91.

Tolls on I-80

FHWA's toll inventory from January 2023 lists six facilities on I-80. The long ones are the Indiana Toll Road and the Ohio Turnpike, which make I-80 a toll road from near Chicago to near Youngstown. I-90 shares those lanes from near Portage, Indiana, to Elyria, Ohio. The bridges charge in one direction each: the Bay Bridge collects from westbound traffic, the Carquinez Bridge from eastbound traffic, and the Delaware Water Gap Toll Bridge from westbound drivers entering Pennsylvania. A trip over the whole route pays on the Indiana and Ohio toll roads in either direction. Eastbound drivers also pay at Carquinez, and westbound drivers pay at the Water Gap and on the Bay Bridge.

The miles shown for each facility describe the whole road or bridge as FHWA files it. The Tri-State Tollway's 82.81 miles cover the full tollway, of which I-80 uses 5.32 miles near Chicago. Apart from the Water Gap bridge, Pennsylvania's 311.21 miles are free. PennDOT and the Pennsylvania Turnpike Commission signed a 50-year lease in October 2007 to toll them, and FHWA rejected the application. Solano County's I-80 Express Lanes, 18 miles between Fairfield and Vacaville, opened after the inventory, on December 16, 2025, with congestion-based tolls for solo drivers.

I-80 auxiliary routes

Nine three-digit routes carry I-80's number, and seven of them are in California, from I-280 between San Francisco and San Jose to the 2-mile I-980 in Oakland. I-280 turns up in five different states, among them a road serving Davenport and Rock Island and a spur into Newark.

How I-80 came together

Some of I-80 is older than the Interstate system. The Ohio Turnpike was finished on October 1, 1955, the year before I-80 appeared in the original 1956 Interstate plan. Pennsylvania's Keystone Shortway, the toll-free route across the state, was dedicated as complete on September 17, 1970. Wyoming completed its last major section on October 3, 1970, and a snowstorm closed it four days later.

The final piece, between Redwood Road and 5600 West in Salt Lake City, opened on August 22, 1986. Interstate Guide calls I-80 the first transcontinental Interstate finished from coast to coast. Wyoming's 77 miles between Rawlins and Laramie close often in winter and carry the nickname Snow Chi Minh Trail, and in 2022 WYDOT floated moving that part of the route north along US 30, an idea that stalled over its estimated cost of $6.1 billion to $12.6 billion.

I-80 traffic and road conditions

Winter sets the terms for much of an I-80 trip, with chain controls over Donner Summit and snow closures across southern Wyoming. Check the traveler site for the state you are in before heading out; the ones linked here run west to east.

I-80 questions