Wikipedia:WikiProject U.S. Roads/Oregon/1917 highways

Sources are on the project page; also helped with the legislative definitions. The information below is from 1918, with changes from 1917 noted.
 * 1 Pacific Highway, Portland to California (via east branch)
 * 1917 law: 6-2 (part), 6-3, 6-5, 7-1
 * 2 Columbia River Highway, Astoria to Pendleton (Umatilla in 1917)
 * 1917 law: 6-1 (part), 6-4 (part), 7-2
 * 3 Coast Highway, Astoria to California
 * 1917 law: 6-1 (part), 6-7, 7-3 (part), 7-4 (part), 8-2 (part)
 * Adopted by SHC in 1917, Garibaldi to Florence and Coquille to California
 * 4 The Dalles-California Highway, The Dalles to California
 * 1917 law: 7-5
 * Adopted by SHC in 1917, Klamath Falls to California?
 * 5 The John Day River Highway, Biggs to Ontario
 * 1917 law: 7-7
 * 6 The Old Oregon Trail ("The Oregon Trail" in 1917), Pendleton (Umatilla in 1917) to Ontario
 * 1917 law: 6-4 (part of the Columbia River Highway)
 * 7 Central Oregon Highway, Bend to Vale
 * 1917 law: 7-9
 * 8 Oregon-Washington Highway, Willows to Washington
 * 1917 law: 6-6
 * 9 Pendleton-John Day Highway, Pilot Rock to John Day
 * Adopted by SHC in 1917
 * 10 La Grande-Enterprise Highway ("La Grande-Joseph Highway" in 1917), La Grande to Joseph
 * 1917 law: 7-8
 * 11 Enterprise-Flora Highway, Enterprise to Flora
 * Adopted by SHC in 1917
 * 12 Baker-Cornucopia Highway, Baker to Cornucopia
 * Adopted by SHC in 1917
 * 13 Baker-Unity Highway, Baker to Unity
 * Adopted by SHC in 1917
 * 14 Antelope-Mitchell Highway, Antelope to Mitchell
 * Adopted by SHC in 1917
 * 15 McKenzie River Highway, Eugene to Dayville
 * 1917 law: 8-3 (part), 8-4
 * Adopted by SHC in 1917, Sisters to Redmond
 * 16 Albany-Sisters Highway, Albany to Sisters
 * 1917 law: 8-5
 * 17 Bend-Sisters Highway, Bend to Sisters
 * 1917 law: 8-3 (part)
 * 18 Lakeview-Burns Highway, Lakeview to Burns
 * Adopted by SHC in 1917
 * 19 LaPine-Lakeview Highway, La Pine to California
 * 1917 law: 7-6
 * Adopted by SHC in 1917, Lakeview to California
 * 20 Klamath Falls-Lakeview Highway, Klamath Falls to Lakeview
 * Adopted by SHC in 1917
 * 21 Ashland-Klamath Falls Highway, Ashland to Klamath Falls
 * Adopted by SHC in 1917
 * 22 Medford-Crater Lake Highway, Medford to Hwy 24 at Crater Lake
 * 1917 law: 8-1 (part)
 * 23 Klamath-Crater Lake Highway, Chiloquin to Hwy 22 at Crater Lake
 * 1917 law: 8-1 (part)
 * 24 The Rim Highway, loop around Crater Lake
 * Adopted by SHC in 1917
 * 25 Grants Pass-Crescent City Highway, Grants Pass to California
 * Adopted by SHC in 1917
 * 26 Mt. Hood Highway, Portland to Hood River
 * Adopted by SHC in 1917
 * 27 Clackamas Highway, Oregon City to Pleasant Home
 * Adopted by SHC in 1917
 * 28 The West Side Highway, Portland to Junction City
 * 1917 law: 6-2 (part), 6-8
 * 29 Forest Grove-McMinnville Highway, Portland to McMinnville
 * 1917 law: 6-2 (part of the Pacific Highway)
 * 30 Salem-Independence Highway, Salem to Independence
 * Adopted by SHC in 1917
 * 31 Albany-Corvallis Highway, Albany to Corvallis
 * Adopted by SHC in 1917
 * 32 Yamhill-Nestucca Highway, McMinnville (Bellevue in 1917) to Hebo (Oretown in 1917)
 * 1917 law: 7-4 (part)
 * 33 Corvallis-Newport Highway, Corvallis to Toledo
 * Adopted by SHC in 1917
 * 34 Eugene-Florence Highway, Eugene to Florence
 * 1917 law: 8-2 (part)
 * 35 Coos Bay-Roseburg Highway, Coquille to Dillard
 * 1917 law: 7-3 (part)
 * 36 Pendleton-Cold Springs Highway, Pendleton to Cold Springs
 * Adopted by SHC in 1917