02 / EXPLORE THE CORRIDOR
Highway 99 in Oregon
Follow the Pacific Highway story through southern Oregon, the Willamette Valley, and the Portland area.
The old north–south road
Historic US 99 served Ashland, Medford, Grants Pass, Roseburg, Eugene–Springfield, and the Portland area. Oregon’s Route 99 and its east and west branches preserve parts of that corridor, alongside roads now maintained locally.
North of Junction City, the branches follow different paths through the Willamette Valley: 99E serves Albany and Salem, while 99W passes through Corvallis and McMinnville. Exact historic street routes depend on the year being studied.
The US 99 designation ended in Oregon in 1971. That date marks a numbering change, not the disappearance of every older road.
Sources: AARoads: Route 99 and Historic US 99
Three starting points
SOUTHERN OREGON
Siskiyous to Eugene
Research focus: early mountain crossings, town streets, bridge approaches, and successive bypasses.
WILLAMETTE VALLEY
99E & 99W
Research focus: the east and west branches, dated highway maps, and changes at their junctions.
PORTLAND AREA
City streets & crossings
Research focus: changes in the urban corridor and its connection across the Columbia River.
Start with dated maps
ODOT’s history page points researchers to digitized Oregon State Highway Maps held by the State Library of Oregon. These are a useful starting point for comparing the corridor across editions.
Sources: ODOT: history and map resources
Next research priority
The first detailed Oregon study will compare a small, well-documented section across several map dates. That will establish a consistent method before extending the overlay through the state.