US 30 and US 20 break the general U.S. Route numbering guidelines in Oregon, since US 20 actually starts south of US 30 in Newport, Oregon and US 30 runs parallel to the north throughout the state (the Columbia River and Interstate 84). The two run concurrently and continue in the correct positioning near Caldwell, Idaho. This is because US 20 was not a planned coast-to-coast route while US 30 was. US 20 originally ended at the eastern entrance of Yellowstone National Park; it was extended to Albany, Oregon in 1940, then again to Newport in 1943.