In 1937, US 28 was truncated at Eugene, Oregon, which then became its western terminus. US 28 was replaced with U.S. Route 26 when U.S. 26 was extended from Wyoming to the Pacific Ocean in 1952. The portion of US 28 from Ontario, OR, to Prineville, OR, became US 26. US 26 then continued in a northwesterly direction to Portland and Astoria. From Prineville to Eugene, US 28 became U.S. Route 126, now known as Oregon Route 126.