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| U.S. Route 95 (Idaho) | |
|---|---|
| State | ID |
| Type | US |
| Route | 95 |
| Length mi | 538.65 |
| Direction a | South |
| Terminus a | Oregon border near McDermitt |
| Direction b | North |
| Terminus b | Canadian border at Eastport |
| Counties | Owyhee County, Ada County, Canyon County, Gem County, Boise County, Valley County, Adams County, Washington County, Payette County, Bonner County, Boundary County |
U.S. Route 95 (Idaho) is the primary north–south highway traversing Idaho, connecting the Oregon Trail corridor at the southwestern border to the Canadian frontier at the northern border. The route links major urban centers, rural communities, and federal lands, serving as a principal artery for commerce, tourism, and regional mobility across Pacific Northwest states and Western United States transportation networks. Managed largely by the Idaho Transportation Department, the highway intersects several U.S. Routes and Interstate Highways and passes near multiple national forests and recreation areas.
The highway enters Idaho near McDermitt from Oregon and proceeds north through the Owyhee Desert toward Boise River valleys, intersecting with Interstate 84 near Parma and Nampa, then continuing through Meridian and into Boise, where it meets I-184 and serves metropolitan communities and industrial zones. North of Boise Ridge, the corridor climbs into Boise National Forest terrain, crossing the Payette River and connecting to McCall and Cascade near Cascade Reservoir and Payette Lake. In central Idaho the route traverses the Salmon River canyon and the Frank Church—River of No Return Wilderness periphery, linking to Grangeville and Lewiston with a crossing of the Snake River near Clarkston and Asotin County. Further north the highway runs through Bonners Ferry and follows the Kootenai River valley before reaching the Canada–United States border at Eastport, providing continuity to British Columbia Highway 95 and transnational freight routes.
The corridor traces earlier Mormon Trail and Oregon Trail migration routes and overlapping U.S. Numbered Highway System designations established in the 1920s, with successive upgrades during the New Deal era and World War II mobilization to support timber, mining, and agriculture. Postwar expansion mirrored Federal-Aid Highway Act of 1956 initiatives, with segments realigned to bypass urban centers such as Boise and to accommodate Interstate 84 interchanges. Late 20th-century projects addressed safety through curvature reduction near Weiser and floodplain stabilization along the Snake River after significant events like the Great Floods of 1964. Recent decades saw cooperative projects with the United States Forest Service and Bureau of Land Management to mitigate environmental impacts while improving freight capacity for companies based in Lewiston and Bonners Ferry.
Major junctions include the interchange with Interstate 84 near Nampa, the concurrency with U.S. Route 20 and U.S. Route 26 in the Boise area, the connection to SH-55 at McCall, crossings with U.S. Route 12 near Lewiston, and intersections with U.S. Route 2/U.S. 95 Business in Bonners Ferry before the border link to British Columbia Highway 95. Other notable interchanges provide access to Idaho State University facilities in regional towns and freight connectors serving the Port of Lewiston.
Designated special routes include business loops and spurs in communities such as Weiser, Payette, Emmett, New Meadows, and Bonners Ferry where signed Business route corridors preserve downtown access while mainline traffic uses bypass alignments. These business routes interact with historic districts listed on the National Register of Historic Places and with multimodal nodes that include Amtrak-served stations and regional airports like Lewiston–Nez Perce County Airport.
Planned projects by the Idaho Transportation Department and regional metropolitan planning organizations include widening segments near Boise Metropolitan Area to accommodate population growth tied to firms such as Micron Technology and sectors around Treasure Valley, realigning steep grades in Valley County for heavy trucks, and replacing aging bridges over the Snake River and Payette River with seismic upgrades following standards promoted by the Federal Highway Administration. Proposals involve coordinated funding from the Congressional Highway Programs and state bonds, with environmental reviews under the National Environmental Policy Act for sections affecting Payette National Forest and other protected lands.
Traffic volumes vary from high-density urban flows in the Treasure Valley—influenced by commuters to Boise State University and St. Luke's Health System facilities—to low-volume rural segments serving timber and agricultural freight toward Oregon and Canada. Safety initiatives address historically dangerous stretches through canyon terrain with measures such as truck escape ramps, wildlife fencing near Kootenai National Wildlife Refuge, and enhanced pavement markings informed by studies from the National Highway Traffic Safety Administration. Seasonal factors include winter closures and avalanche mitigation near higher-elevation passes managed in coordination with National Weather Service forecasts.
The highway fosters tourism to destinations such as Hells Canyon, Craters of the Moon, Coeur d'Alene, and recreational hubs like McCall and Payette Lake, supporting hospitality sectors and outfitters affiliated with events like the Idaho Festival of Trees and regional fairs. It underpins freight movement for agricultural exporters shipping through the Port of Lewiston and connects suppliers serving technology firms including HP Inc. and manufacturing plants in the Treasure Valley. Cultural landscapes along the route reflect Nez Perce National Historical Park sites and interactions with tribal nations such as the Nez Perce Tribe and Coeur d'Alene Tribe, influencing heritage tourism and cooperative stewardship of corridors crossing ancestral lands.
Category:U.S. Highways in Idaho Category:Transportation in Idaho