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| US 10 | |
|---|---|
| Route | 10 |
| Type | US Highway |
| Length mi | approx. 2,000 |
| Established | 1926 |
| Direction | A=West |
| Terminus A | Seattle |
| Direction | B=East |
| Terminus B | Boston |
| States | California, Nevada, Utah, Colorado, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New Jersey, New York, Massachusetts |
US 10
US 10 is a transcontinental United States Numbered Highway that historically connected Seattle on the Pacific Coast with Boston on the Atlantic Coast. The route passes through major urban centers such as Portland, Salt Lake City, Denver, Omaha, Chicago, Cleveland, Pittsburgh, Philadelphia, and New York City, linking landmark crossings like the Columbia River, the Rocky Mountains, the Mississippi River, and the Hudson River. Over its existence the highway intersected with interstate corridors including Interstate 5, Interstate 15, Interstate 80, Interstate 70, and Interstate 90, and it has been subject to numerous realignments, bypasses, and decommissionings influenced by projects such as the Federal Aid Highway Act of 1956.
The western segment begins near Seattle and traverses the Puget Sound region before following corridors toward Portland and crossing the Columbia River at historic bridges associated with projects like the Bonneville Dam development. East of Portland the route climbs through the Columbia Plateau and approaches mountain passes used since the Oregon Trail era, intersecting routes to Boise and Spokane. In the interior West US 10 negotiates the Great Basin near Salt Lake City and follows valley floors and mountain gaps through the Wasatch Range and Rocky Mountains, providing access to Denver and mining towns linked to the Colorado Gold Rush.
Continuing across the High Plains the routing served Omaha and crossed the Missouri River near historic ferry and bridge sites tied to expansion during the era of the Transcontinental Railroad. In the Midwest the corridor linked Des Moines-area alignments and then connected into the Chicago metropolitan mesh, where it paralleled rail arteries belonging to Chicago, Burlington and Quincy Railroad and Pennsylvania Railroad corridors. East of Chicago the highway traced industrial and Great Lakes shore corridors toward Cleveland and Pittsburgh, intersecting turnpikes and river crossings significant to the Erie Canal heritage. In the Northeast US 10 threaded through the Lehigh Valley, crossed the Hudson River at ferry and bridge sites associated with George Washington Bridge-era expansions, and finished in Boston after passing through Hartford and Providence corridors.
Designated in the original 1926 United States Numbered Highway plan, US 10 reflected efforts by the American Association of State Highway Officials and state highway departments to create national overland routes. Early 20th-century road advocates such as Carl G. Fisher and Benton MacKaye influenced regional alignments that connected motoring clubs, industrial centers like Pittsburgh and Chicago, and port cities like Seattle and Boston. During the Great Depression New Deal-era projects including those administered by the Works Progress Administration and the Civilian Conservation Corps improved sections of the route, and wartime mobilization in World War II elevated its importance for transport to Puget Sound Naval Shipyard and steelworks in Cleveland.
Postwar construction under the Federal Aid Highway Act of 1956 led to replacement of many US 10 segments by Interstate corridors such as Interstate 90 and Interstate 80, prompting state-level re-designations and urban bypasses. Notable alterations included bypasses around Spokane, realignments near Salt Lake City associated with Hoover Dam era infrastructure, and truncations in the Midwest after construction of Interstate 80 and Interstate 90. Preservationists and local historical societies in places like Missoula and Cheyenne documented surviving roadside artifacts, while transportation agencies such as the Federal Highway Administration coordinated decommissioning protocols.
Key historic and extant intersections comprised junctions with Interstate 5 near Seattle, U.S. Route 101 near Portland, Interstate 84 in the Columbia River Gorge corridor, and crossings of Interstate 15 adjacent to Salt Lake City. In the Rockies the route met U.S. Route 6 and Interstate 70 near Denver, then intersected U.S. Route 75 and Interstate 29 approaching Omaha and the Missouri River. In the Midwest there were major nodes at Interstate 80 and U.S. Route 34 near Chicago, and lakefront connections with U.S. Route 20 at Cleveland. Eastward the highway crossed U.S. Route 30 near Pittsburgh, met Interstate 76 in the Lehigh Valley, and had terminations interacting with Interstate 95 and approaches into Boston via Hartford and Providence corridors.
Over time numerous special routings were established, including business loops through downtown Spokane and Chicago districts, alternate alignments serving Boise and agricultural communities along the Snake River valley, and bypasses created to relieve urban congestion in Cleveland and Providence. Several state Departments of Transportation authorized spur routes linking industrial parks, such as those near Tacoma and Bellingham, while historic auto trail organizations documented alignments overlapping with the Lincoln Highway and National Old Trails Road. Some business and alternate routes remain signed for access to central business districts, whereas many have been absorbed into state route systems or municipal streetscapes.
Planning documents from state DOTs and the Federal Highway Administration describe continued adjustments: urban complete-street projects in Seattle and Boston, resilience upgrades in mountain passes vulnerable to landslides near the Wasatch Range, and multimodal corridor studies linking remaining US 10 segments to regional rail hubs like Union Station (Chicago) and South Station (Boston). Climate adaptation plans reference floodplain work along the Mississippi River floodways and pavement rehabilitation programs in partnership with entities such as the Environmental Protection Agency for stormwater management. Proposals include preservation of historic alignments by state historic preservation offices and potential designation of certain stretches as scenic byways to recognize associations with routes like the Oregon Trail and the Lincoln Highway.
Category:United States Numbered Highways