Jefferson (proposed Pacific state) Jefferson (proposed Pacific state) The State of Jefferson is a proposed U.S. state that would span the contiguous, mostly rural area of southern Oregon and northern California, where several attempts to separate from Oregon and California, respectively, have taken place. This region on the Pacific Coast is the most famous of several that have sought to adopt the name of Thomas Jefferson, the third President of the United States. Jefferson, who sent the Lewis and Clark expedition into the Pacific Northwest in 1803, envisioned the establishment of an independent nation in the western portion of North America that he dubbed
Washington State Route 510 also became (I-5) in 1968. SR 510 between I-5 and Pacific Avenue was reconstructed and widened in late 2003, with the addition of a roundabout at the Pacific Avenue intersection. The I-5 interchange will be replaced in 2020 with a diverging diamond interchange that began construction in October 2018. The interchange will be the first diverging diamond constructed in Washington and is estimated to cost $72 million, with funding provided by the state legislature's 2015 Connecting Washington package. State Route 510 Alternate, also known as the Yelm Loop, is a partially completed bypass of Yelm. The first, section opened to