In the U.S. state of Oregon, there are two systems for categorizing roads in the state highway system: named state highways and numbered state routes. Named highways, such as the Pacific Highway No. 1 or the North Umpqua Highway East No. 138, are primarily used internally by the Oregon Department of Transportation (ODOT) whereas numbered routes, such as Interstate 5 (I-5), U.S. Highway 20 (US 20), or Oregon Route 140 (OR 140), are posted on road signs and route markers. The two systems overlap significantly, but the route numbers are not necessarily coterminous with highway names and some routes may comprise several highways. For example, OR 47 is overlaid on the Mist–Clatskanie Highway No. 110, Nehalem Highway No. 102, and Tualatin Valley Highway No. 29. In addition to OR 47, the Tualatin Valley Highway No. 29 also comprises part of OR 8.
The primary state highway system was designated in 1917 with 36 highways, some of which were designated by the Oregon State Legislature and the rest were added by the Oregon State Highway Commission. Starting in 1931, the highway commission took over maintenance of several county "market roads" that became the secondary state highway system. State highways have a route number that is used internally by ODOT; primary highways have a one- or two-digit route number (i.e., the Columbia River Highway No. 2 or the Pendleton–John Day Highway No. 28) and secondary highways have a three digit route number (i.e., the Jefferson Highway No. 164). Secondary highways are numbered by county; each county has a range of ten numbers. For instance, Highways 330 to 339 are in Umatilla County. __FORCETOC__
List of state highways
Former named state highways This list contains former names used by the Oregon Department of Transportation and predecessors for state highways. It includes former names for current state highways and roads that are no longer state highways.
Adrian-Parma Highway Albany-Sisters Highway Alsea River Forest Road Ashland-Klamath Falls Highway Athena-Cold Springs Highway Baker-Cornucopia Highway Baker-Homestead Highway Baker-Unity Highway Banfield Expressway Beaverton-Aurora Highway Beech Creek Highway Bend-Sisters Highway Bertha-Beaverton Highway Boardman-Stanfield Highway Burns-Crane Highway Butteville Road-Hubbard Highway Canyon City-Burns Highway Canyon Road Cascade Highway (Oregon) Cascade Locks Highway Coast Highway (Oregon) Columbia River Highway West Corvallis-East Side Highway Crane-Scotts Butte Highway Crooked River-Paulina Highway Crown Point Highway Dallas-Coast Highway Dallas-Dolph Corner Highway Dallas-Kings Valley Highway Dillard Highway Drain-Yoncalla Highway East Diamond Lake Highway East Portland-Oregon City Highway Enterprise-Flora Highway Eugene-Florence Highway Eugene-Swisshome Highway Forest Grove-McMinnville Highway Fulton Canyon-Wasco Highway Grants Pass-Crescent City Highway Halfway Highway Hillsboro-Woodburn Highway Homedale Spur Highway Jordan Valley Highway Klamath Falls-Weed Highway Klamath-Crater Lake Highway La Grande-Enterprise Highway La Grande-Joseph Highway La Grande-North Powder Highway La Grande-Wallowa Lake Highway La Pine-Lakeview Highway Little Butte Highway Mapleton-Eugene Highway McDermitt-North Highway McKenzie River Highway McMinnville-Tillamook Highway Medford-Crater Lake Highway Medford-Provolt Highway Monument Highway Mount Hood Loop Highway Mount Hood-Clear Lake Highway Myrtle Creek Highway Nyssa-Adrian Highway Oakland-Shady Highway Old Columbia River Drive Highway Otter Rock Highway Portland-Salem Expressway Prineville-Bear Creek Highway Prineville-Lakeview Highway Richardson-Eugene Highway Rim Drive Robinette-Homestead Highway Rome-Princeton Highway Roosevelt Coast Highway Salem Freeway Salem-Dallas Highway Salem-Independence Highway Sandy Boulevard Highway Siuslaw Highway Springfield-Cottage Grove Highway Starkey Highway Sullivan Gulch Highway Sumpter Valley Highway Three Mile Lane Highway Tiller-Summit Forest Road Tiller-Trail Highway Umatilla Cutoff Highway West Portland-Hubbard Highway West Side Pacific Highway Willamette Valley-Florence Highway Williams Highway Wolf Creek Highway Woodburn-Mount Hood Loop Highway Woodburn-Sandy Highway Yamhill-Nestucca Highway Yellowstone Cut-off Highway
See also List of former named state highways in Oregon
References