History of Interstate 80 in Timeline

By Popular Timelines Editorial Team · Updated: April 8, 2026

Interstate 80 (I-80) is a transcontinental freeway stretching from San Francisco, California, to Teaneck, New Jersey. Established in 1956 as part of the original Interstate Highway System, its final segment opened in 1986. As the second-longest Interstate Highway in the U.S., spanning 2,900.76 miles (4,668.32 km), I-80 connects numerous major cities, including Oakland, Sacramento, Reno, Salt Lake City, Cheyenne, Omaha, Des Moines, and Toledo. It also passes near major metropolitan areas like Chicago, Cleveland, and New York City, serving as a crucial transportation artery across the northern portion of the United States.

1956: Interstate Highway System Plan

In 1956, I-80 was included in the original plan for the Interstate Highway System.

1956: Highway Designation

In 1956, Interstate 80 was designated as one of the original routes of the Interstate Highway System.

1958: Section Constructed

In 1958, a section of I-80 running from Netcong to Denville was constructed.

1971: Turnpike Extension

In 1971, the I-95/New Jersey Turnpike was extended from Ridgefield to I-80 in Teaneck, and the section from Teaneck to Fort Lee was resigned as I-95.

1981: Basin and Range Published

In 1981, John McPhee published "Basin and Range", the first in a series of books about the geology revealed by the building of I-80.

1986: Final Piece Completed

In 1986, the final piece of I-80 was completed on the western edge of Salt Lake City.

1993: Series of Books Completed

By 1993, John McPhee had completed a series of books on the geology revealed by the building of I-80.

1998: Annals of the Former World

In 1998, John McPhee's series of books were collected into a one-volume edition, Annals of the Former World.

1999: Pulitzer Prize Won

In 1999, Annals of the Former World by John McPhee won a Pulitzer Prize.

October 15, 2007: Lease Agreement Signed

On October 15, 2007, the Pennsylvania Department of Transportation (PennDOT) and the Pennsylvania Turnpike Commission (PTC) signed a 50-year lease agreement, allowing the PTC to maintain and toll I-80.