1. Christensen H. 2006. Personal communication - Flow stage and measurement station cross-section for the Grays River station (ID 25B060). Washington Department of Ecology.
2. Diefenderfer H. 2006. Person communication - Water surface elevation data collected from Kandoll Road Restoration Project Area. Battelle - Pacific Northwest National Laboratory Marine Science Laboratory.
3. National Oceanographic and Atmospheric Administration. 2006. Tidal elevations at Tongue Point (ID# 9439040). http://tidesandcurrents.noaa.gov/
4. US Army Corps of Engineers. January 17 1986. Columbia River Flood Profiles. Chart CL-03-133/3A.