I think the fish disperse rather quickly after being dumped in there. It's been a while since I've been out there, but I used to fish the Willamette below the confluence of that nasty duck pond water, and have always done pretty well, while never having much success elsewhere. I think they're just going downstream. Although, if you have a 'toon, kayak or other small craft, you can take it up the canal to the big pond (you can walk into near the bmx track), and there's some pretty good sized fish holding out in the middle of it, but never done terribly well in recent years from the bank. When i was a kid though, i remember always catching fish from those banks.