There seems to be an imaginary line from the Washington side high spanned section of the bridge to Tongue Point that the upriver salmon seem to follow and cross over the shallows at high tide to the main channel on the Oregon side. The few that stay near the Washington shore in the uppe...
Summary of the Columbia Plateau Regional Aquifer-System Analysis, Washington, Oregon, and Idaho; Professional Paper; U.S. Geological Survey: Reston, VA, USA, 1999; p. 64. Douglas, A.A.; Osiensky, J.L.; Keller, C.K. Carbon-14 Dating of Ground Water in the Palouse Basin of the ...