Mike,
Good to see a forester interested in these issues! A great book on general stream ecology is "the ecology of running waters" by H.B.N Hynes, published by the Liverpool University Press, 1970 (ISBN#0 85323 100 1). It may be out of print, and, if so, check with powells.com, the online used book store. If they do not have it in stock, you can have them notify you when it comes in. I will also reply to you tomorrow with some journal article references on stream geomorphology (the physical shape and behavior of streams) and stream ecology. Thanks for your interest! -- Rick