Old Oregon Trail Highway

The Old Oregon Trail Highway was an auto trail roughly following the Oregon Trail from Independence, Missouri to Seaside, Oregon and Olympia, Washington. In the U.S. Highway system, it became:
 * US 40, Kansas City to Wamego (now partly US 24)
 * No through road, Wamego to Grand Island via Marysville, Fairbury, Hebron, and Hastings
 * US 30, Grand Island to Ogallala
 * US 26, Ogallala to Dwyer
 * US 185, Dwyer to Orin (now US 87)
 * US 20, Orin to Casper
 * US 87E, Casper to Muddy Gap (now WYO 220)
 * No through road, Muddy Gap to Granger
 * US 30N, Granger to Cotterel (now US 30)
 * US 30, Cotterel to Astoria
 * US 101, Astoria to Seaside
 * US 99, Portland to Olympia (now I-5)

The name is still used in Oregon for Interstate 84 east of U.S. Route 730, which is named the Old Oregon Trail Highway No. 6 (see Oregon highways and routes).