U.S. Route 26

U.S. Route 26
State	US
Type	US
Route	26
Length mi	1382
Direction a	West
Terminus a	Astoria, Oregon
Direction b	East
Terminus b	Ogallala, Nebraska
States	Oregon; Idaho; Wyoming; Nebraska

U.S. Route 26 is a major east–west United States Numbered Highway that traverses the Pacific Northwest and Great Plains, linking Astoria on the Columbia River with Ogallala on the eastern High Plains. The highway connects coastal and inland communities, crossing the Cascade Range and the Blue Mountains before following river valleys and plains through Idaho, Wyoming, and Nebraska. U.S. Route 26 serves as a corridor for freight, tourism, and regional travel, intersecting several Interstate Highways and historic trails.

Route description

From its western terminus at Astoria, the route follows the Columbia River corridor near the Astoria–Megler Bridge and proceeds southeast through Seaside, Cannon Beach, and along the northern Oregon coast before turning inland toward Portland. Through the Portland metro area it intersects Interstate 5, I-405, and meets the Willamette River crossings near St. Johns Bridge, serving commuters to Oregon Health & Science University and the Port of Portland. East of Portland U.S. Route 26 climbs the Cascade Range via the Bogue Falls approaches and passes near Mount Hood, providing access to Timberline Lodge and Mount Hood Meadows. Descending into the Willamette Valley and then the John Day River basin, the highway passes through Prineville, Ochoco National Forest, and joins U.S. Route 20 around Burns before crossing into Idaho near Nyssa and Vale. In Idaho U.S. Route 26 traverses the Snake River plain, passing Nampa, Boise, and concurrent segments with I-84 and US 20 toward Sun Valley and Shoshone. Entering Wyoming the road enters the Teton Pass approaches and the Yellowstone region, overlapping corridors with US 89 and US 191 near Jackson Hole and Grand Teton National Park. Crossing the Big Horn Basin and Wind River Range approaches, it connects to Cody and Casper before following river valleys into Nebraska. In Nebraska U.S. Route 26 parallels the North Platte River through Scottsbluff and joins I-80 near Ogallala where it terminates.

History

The corridor predates automobile highways, following sections of the Oregon Trail, the Lewis and Clark Expedition, and 19th-century wagon roads used during the California Gold Rush and Homestead Act migrations. Designated in the 1920s under the United States Numbered Highway System planning, the route absorbed earlier state roads and connected with transcontinental corridors like U.S. Route 30 and U.S. Route 20. Key 20th-century developments included realignments in the Portland metropolitan area to integrate with I-5 construction), mountain passes improved during New Deal-era programs linked to the Civilian Conservation Corps, and mid-century upgrades to accommodate increasing freight tied to the Port of Portland and agricultural exports from Idaho and Nebraska. Late-20th and early-21st-century projects added safety improvements near Mount Hood, interchange reconstructions adjacent to Boise State University, and environmental mitigations in corridors near Yellowstone National Park and Grand Teton National Park.

Major intersections

Major junctions include connections with US 30 and I-84 in the Columbia River Gorge corridor, interchanges with Interstate 5 and I-405 in Portland, concurrency segments with U.S. Route 20 through Idaho and Wyoming, an overlap with US 89 near Jackson, and termination at I-80 near Ogallala. Other significant crossings include US 97 near Bend, US 95 in Idaho Falls, and US 85 in Casper.

Special routes

Several auxiliary and business routings have been established to serve city centers and historic alignments, including business loops through Astoria, Boise, Jackson Hole, and Scottsbluff. Bypass designations around Prineville and Cody reflect local access needs, while scenic alternates provide designated access to Mount Hood, Sun Valley, and Yellowstone National Park. Preservation efforts for historic segments involve partnerships with National Park Service units, state historic preservation offices in Oregon, Idaho State Historical Society and Wyoming SHPO.

Traffic and maintenance

Traffic volumes vary from heavy urban flows in the Portland metropolitan area and Boise metro area to sparse rural counts across the Blue Mountains and Nebraska Sandhills. Maintenance responsibilities are divided among the Oregon Department of Transportation, Idaho Transportation Department, Wyoming Department of Transportation, and Nebraska Department of Transportation, which coordinate on snow removal across the Cascade Range and avalanche mitigation near Mount Hood, bridge inspections of crossings like the Astoria–Megler Bridge, and pavement rehabilitation projects financed in part by federal aid programs such as those administered by the Federal Highway Administration.

Future developments

Planned improvements include interchange reconstructions in the Portland metropolitan area to improve freight movement to the Port of Portland, capacity and safety upgrades near Boise Airport supporting Ada County growth, and corridor resilience projects addressing climate-driven runoff in watersheds feeding the Snake River and North Platte River. Studies by state departments and metropolitan planning organizations such as the Portland Metro and Ada County Highway District evaluate potential bypasses, widening, and bridge replacements, while federal initiatives tied to Infrastructure Investment and Jobs Act funding may accelerate multimodal investments and electric vehicle charging deployments along the route.

Category:United States Numbered Highways