The longest road in America was once notorious for being the worst in existence.

Cultures · Published 10 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: Spanning 3,254 miles from the Pacific to the Atlantic, U.S. Route 20 is the longest highway in the United States. While it now serves as a vital cross-country artery, one segment in Ohio was once so treacherous that travelers could spend three full days traversing just a single mile.

U.S. Route 20 is a massive coast-to-coast undertaking, stretching from Newport, Oregon, to Kenmore Square in Boston, Massachusetts. Its designation as a major route is signaled by the zero in its number. Though it officially spans over 3,250 miles, the road is not a singular, unbroken path; it features a notable discontinuity through Yellowstone National Park, where motorists must navigate unnumbered roads to traverse the landscape. The route was not originally planned as a continuous coast-to-coast highway, and it was only extended to its current western terminus in 1940.

The road’s history is a patchwork of regional paths, some of which were once infamous. Between Fremont and Perrysburg, Ohio, the route follows the path of the 1830s-era Maumee and Western Reserve Road. Known colloquially as the Mud Pike, it cut through the Great Black Swamp and gained a reputation as the worst road on the continent. The mud was so severe that it frequently trapped wagon wheels, forcing travelers to endure grueling, slow-motion journeys. In other regions, the road evolved to accommodate modern needs; in Indiana, the Dunes Relief Road was constructed to bypass the congested Dunes Highway, while in Massachusetts, Henry Ford personally funded a bypass in 1928 to protect the foundations of the historic Wayside Inn from heavy truck traffic.

Today, the highway serves as a living museum of American transit, carrying various local names like the General U.S. Grant Highway in Illinois and the Jacob's Ladder Trail in Massachusetts. It remains a vital corridor, with segments like the St. Joseph Valley Parkway in Indiana providing modern, limited-access travel. Whether it is the Idaho Medal of Honor Highway or the historic Boston Post Road, Route 20 reflects the shifting priorities of American infrastructure—from the mud-choked tracks of the 19th century to the streamlined freeways of the 21st.

The route's evolution continues to be managed by organizations like the Historic US Route 20 Association, formed in 2012 to preserve its diverse alignments. From the rural landscapes of the Nebraska Sandhills to the industrial arteries of Gary, Indiana, the highway remains a primary lens through which to view the development of the American interior.

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