Originally, Route 2, the Columbia River Highway, was meant to run from Astoria to Pendleton. While, some sources, including Samuel Lancaster himself, seem to indicate the western terminus of the highway was in Seaside, for a long time I was unable to find any official records showing that any roads from Astoria west to the ocean were ever considered to be a part of Route 2, and I started thinking that this was more of a sentimental addition to the highway rather than an official designation, extending the road all the way west to meet the ocean's waves at the Seaside roundabout.
However, since then I have confirmed that, for a very, very brief moment in time, the Oregon Highway Commission did consider the highway between Seaside and Astoria to be part of Route 2.