Wikipedia:WikiProject U.S. Roads/Oregon/List of laws
Early laws are in [http://books.google.com/books?id=Ab1IAAAAMAAJ].
;1917
- 423
- Section 6: to be permanently constructed with a hard surface:
- #Columbia River Highway, Multnomah-Columbia line to Tillamook-Clatsop line: part of Hwy 2, part of Hwy 3
- #Pacific Highway, Multnomah-Washington line to Douglas-Lane line: Hwy 29, part of Hwy 28, part of Hwy 1
- #Pacific Highway, Multnomah-Clackamas line to Junction City: part of Hwy 1
- #Columbia River Highway, Multnomah-Hood River line to Idaho: part of Hwy 2, Hwy 6
- #Pacific Highway, Jackson County: part of Hwy 1
- #Arlington to Washington: Hwy 8
- #Clatsop-Tillamook line to Garibaldi: part of Hwy 3
- #Multnomah-Washington line to McMinnville: part of Hwy 28
- post roads
- #Pacific Highway, Douglas-Lane line to Jackson-Josephine line: part of Hwy 1
- #Columbia River Highway, any parts of hard-surfaced #4 that aren't to be hard-surfaced: part of Hwy 2
- #Roseburg to Marshfield: Hwy 35, part of Hwy 3
- #McMinnville to Tillamook: Hwy 32, part of Hwy 3
- #The Dalles to Klamath Falls: part of Hwy 4
- #Bend to Lakeview: part of Hwy 19
- #Sherman or Gilliam County (Biggs) to Idaho: Hwy 5
- #La Grande to Joseph: Hwy 10
- #Bend to Vale: Hwy 7
- forest roads
- #Medford to Klamath County (Fort Klamath): Hwy 22, Hwy 23
- #Lane County (Eugene) to Coos County (Marshfield): Hwy 34, part of Hwy 3
- #Eugene to Bend: part of Hwy 15, Hwy 17
- #(Dayville to Redmond): part of Hwy 15
- #Albany to Bend: Hwy 16, Hwy 17
;1921
- 395: Roosevelt Coast Military Highway, Astoria to California including 1917 highways: Hwy 9
;1929
- 298: relocate Hwy 12 between Halfway and Cornucopia
;1933
- 106: Valley Falls to John Day: Hwy 49, Hwy 48
;1939
- 529 s15: redescribed by name (numbers not in law)
- Pacific Highway East 1E: Washington to Junction City
- Pacific Highway West 1W: north of Portland to Junction City
- Pacific Highway 1: Junction City to California
- Columbia River Highway 2: Astoria to Washington
- Oswego Highway 3: Portland to Oregon City
- The Dalles-California Highway 4: The Dalles to California swapped with 50
- John Day Highway 5: Arlington to Vale, branch to Austin east end became 7
- Old Oregon Trail 6: Umatilla to Idaho (Nyssa), branches to Idaho (Weiser, Payette, Ontario)
- Central Oregon Highway 7: Bend to Ontario east end replaced 5
- Heppner Highway 52: Heppner Junction to Pilot Rock split from 8
- Oregon Coast Highway 9: Astoria to California
- Wallowa Lake Highway 10: La Grande to Joseph
- Enterprise-Lewiston Highway 11: Enterprise to Washington, branch to Flora
- Baker-Homestead Highway 12: Baker to Idaho
- Baker-Unity Highway 13: Baker to Unity
- Crooked River Highway 14: Prineville to Brothers
- McKenzie Highway 15: Eugene to Redmond
- Santiam Highway 16: Albany to Sisters
- McKenzie-Bend Highway 17: Sisters to Bend
- Willamette Highway 18: Goshen to Crescent
- Fremont Highway 19: La Pine to California
- Klamath Falls-Lakeview Highway 20: Klamath Falls to Lakeview
- Green Springs Highway 21: Ashland to Klamath Falls
- Crater Lake Highway 22: Medford to Fort Klamath
- Dairy-Bonanza Highway 23: Dairy to Bonanza
- Burns-Crane Highway 24: Burns to Crane
- Redwood Highway 25: Grants Pass to California
- Mt. Hood Highway 26: Portland to Hood River
- Alsea Highway 27: Waldport to Philomath
- Pendleton-John Day Highway 28: Pendleton to John Day extended over former 8
- Tualatin Valley Highway 29: Portland to McMinnville
- Salem-Dallas Highway 30: Salem to Dallas
- Albany-Corvallis Highway 31: Albany to Corvallis
- Three Rivers Highway 32: Hebo to Valley Junction east end became 39
- Corvallis-Newport Highway 33: Newport to Corvallis
- Siuslaw Highway 34: Florence to Junction City
- Coos Bay-Roseburg Highway 35: Coquille to Dillard
- Pendleton-Cold Springs Highway 36: Pendleton to Cold Springs
- Wilson River Highway 37: Tillamook to North Plains
- Oregon Caves Highway 38: Kerby to Oregon Caves
- Salmon River Highway 39: Otis to McMinnville east end replaced 32
- Beaverton-Hillsdale Highway 40: Beaverton to Portland
- Ochoco Highway 41: Redmond to Dayville
- Sherman Highway 42: Biggs to Cow Canyon
- Monmouth-Independence Highway 43: Monmouth to Independence
- Wapinitia Highway 44: Government Camp to Maupin
- Umpqua Highway 45: Reedsport to Drain
- Necanicum Highway 46: Necanicum to Wheeler designated over former 9
- Wolf Creek Highway 47: Cannon Beach Junction to Portland
- John Day-Burns Highway 48: John Day to Burns
- Lakeview-Burns Highway 49: Valley Falls to Burns
- Klamath Falls-Malin Highway 50: Klamath Falls to California swapped with 4
- West Portland-Hubbard Highway 51: Portland to Hubbard
- Oregon-Washington Highway 8: Pendleton to Washington 52 split off
;1957
- 123
- Pacific Highway 1: extended north to Washington
- Pacific Highway East 1E: both ends truncated, Pacific Highway north of Portland to Pacific Highway south of Salem
- Pacific Highway West 1W: Pacific Highway East changed to Pacific Highway; south end extended to Pacific Highway near Eugene
- Columbia River Highway 2: no change?
- Old Oregon Trail 6: loosened; still goes to Idaho near Nyssa
- Oregon Coast Highway 9: no change?
- Baker-Homestead Highway 12: added Pine Valley and Copperfield
- Santiam Highway 16: loosened
- Mt. Hood Highway 26: east end moved from Hwy 2 east of Hood River to Hwy 2 west of Hood River
- Albany-Corvallis Highway 31: loosened
- Siuslaw Highway 34: Pacific Highway changed to Pacific Highway West
- Sunset Highway 47: Pacific Highway West changed to Pacific Highway
- Wilsonville-Hubbard Highway 51: north end truncated from Pacific Highway West to Pacific Highway
;1977
- repealed all laws designating highways