The sections concurrent with I-84 are part of the Columbia River Highway No. 2 west of U.S. Route 730 at Boardman and part of the Old Oregon Trail No. 6 east of U.S. Route 730. There is also a U.S. Route 30 Business signed in the Ontario area. This is part of the Olds Ferry-Ontario Highway No. 455. History Sections of the highway between The Dalles and Ontario generally follow the route of the Oregon Trail, which was used in the 19th century by American settlers to reach the Willamette Valley. US 30 was created as part of the initial United States Numbered Highway System adopted by the American Association of State Highway Officials on November 11, 1926. The number was assigned in place of US 20, which had originally been planned for the corridor in Oregon, after objections from the state government. The new national highway incorporated portions of existing state roads, including the Columbia River Highway, which was constructed between 1913 and 1922 through the Columbia River Gorge. Before the Banfield Expressway was built, the Portland section of US 30 ran on St Helens Road to the Willamette Heights section of Portland, then on Wardway Street, then Vaughn Street, then NW 18th & 19th Avenues, then Burnside Street, and then Sandy Boulevard towards Troutdale. Several sections of the old highway use brown road markers with "Historic US 30" that were installed in the 21st century. The Interstate Highway System, approved by the federal government in 1956, included construction of a freeway in Oregon along the US 30 corridor between Portland and Ontario; it was later numbered I-80N (now I-84). The Oregon state government unsuccessfully proposed an extension to cover the rest of US 30 between Astoria and Portland in the 1950s and 1960s, which was two lanes wide and in need of funding for improvements. The Astoria–Portland section had been rebuilt with fewer curves by the 1960s, but remained congested due to its use as a tourist route as well as a bypass of US 99 (and I-5) upon the removal of tolls from the Lewis and Clark Bridge near Longview, Washington. In 1969, the state government announced plans to widen the highway between Burlington and the Columbia County border, but declined to fund further projects in favor of improvements in the Portland area. The state later withdrew its proposals to upgrade the entire section to an expressway,