Here are few reference books that might help:

A history of Columbia River Salmon and Steelhead by the Army Corp of Engineers. This is an excellent reference guide that covers the CR fishery back to the 1800's and covers many of the things they have done and currently are doing to save salmon and steelhead.
http://www.nww.usace.army.mil/lsr/REPORTS/save_salmon/salmontoc.htm


and
Salmon and Society in the Pacific Northwest by the Commision of Life Sciences - A book that can be read online about the plight of anadromous fish in the Pacific Northwest.
http://books.nap.edu/books/0309053250/html/index.html

and
Blueprint for Hatchery Reform - Published by Trout Unlimited, it offers a "landscape approach" to hatchery reform in the PNW
http://www.tu.org/pdf/conservation/landscapemedia.pdf