1. Fish Ecology Division, Northwest Fisheries Science Center, National Oceanic and Atmospheric Administration, 520 Heceta Place, Hammond, OR 97121, USA.
2. US Fish and Wildlife Service, Arcata Fish and Wildlife Office, 1655 Heindon Road, Arcata, CA 95521, USA.
3. Humboldt State University, Fisheries Biology Department, 1 Harpst St., Arcata, CA 95521, USA.
4. US Geological Survey, California Cooperative Fish and Wildlife Research Unit, Humboldt State University, 1 Harpst St., Arcata, CA 95521, USA.
5. Ecosystem Analysis Program, Fish Ecology Division, Northwest Fisheries Science Center, National Oceanic and Atmospheric Administration, 3305 E. Commerce St., Pasco, WA 99301, USA.
6. Conservation Biology Division, Northwest Fisheries Science Center, National Oceanic and Atmospheric Administration, Manchester Research Station, 7305 Beach Dr. E., Port Orchard, WA 98366, USA.
7. Pacific States Marine Fisheries Commission, Astoria, OR 97103, USA.
8. Sturgeon and Smelt Projects, Columbia River Management Unit, Washington Department of Fish and Wildlife, 5525 South 11 th St., Ridgefield, WA 98642, USA.
9. US Army Corps of Engineers, Portland District, Fisheries Field Unit, P.O. Box 150, Cascade Locks, OR 97014, USA.