I'm sorry n8r1. That sort of thing is happening all over.
Bear Creek in Medford is one such creek that was polluted so bad that it was highly recommended for people not to fish there. Salmon runs all but ceased, trout died out, and some non-native fish moved in. In high school, my friends and I used to have XC meets at Bear Creek Park, which we affectionately called "Bear Creek Industrial Park" after one of them fell in the creek and got cut by broken glass.
Recently, conditions have improved, so there is some hope for Fanno Creek. I fished at Bear Creek about two years ago, and I caught half a dozen rainbows and a strange fish that I think was a goldfish that had reverted to its natural colors.
It still has a long way to go, but at least the water doesn't smell like sewage any more, and the fact that trout were in it means the water quality is okay...
You may consider getting Trout Unlimited involved. They do a lot of streamside cleanups if you can get enough people to help. Just a thought.