Biggs Junction is an unincorporated community and census-designated place in Sherman County, Oregon, United States. Biggs Junction is located on the south side of the Columbia River at the junction of Interstate 84/U.S. 30 and U.S. 97 where it crosses the Sam Hill Memorial Bridge over the river from Washington. The population was 22 at the 2010 c…Biggs Junction is an unincorporated community and census-designated place in Sherman County, Oregon, United States. Biggs Junction is located on the south side of the Columbia River at the junction of Interstate 84/U.S. 30 and U.S. 97 where it crosses the Sam Hill Memorial Bridge over the river from Washington. The population was 22 at the 2010 census.