Lower Columbia Fish Recovery Board (December 2004). "Volume II – Subbasin Plan Chapter G – NF and EF Lewis"(PDF). Lower Columbia Salmon Recovery and Fish & Wildlife Subbasin Plan. Northwest Power and Conservation Council. Archived from the original(PDF) on February 13, 2012. Retrieved October 14, 2008.
Lower Columbia Fish Recovery Board (December 2004). "Volume II – Subbasin Plan Chapter G – NF and EF Lewis"(PDF). Lower Columbia Salmon Recovery and Fish & Wildlife Subbasin Plan. Northwest Power and Conservation Council. Archived from the original(PDF) on February 13, 2012. Retrieved October 14, 2008.