My only attempt was at Green Peter last year around this time, fished the Quartzville creek arm. There are plenty of Kokanee in there, but that also means they are small in size, roughly 8 inches only. I hear they are bigger in Detroit but in less numbers.
Blue lake in Troutdale has some really nice sized carps. Try by the fishing/boating dock on both sides. Use canned corn kernel on a Carolina rig around summer time.
mt hood is actually a really good fishing spot, but now its only open to anyone 17 and under. during stocking weeks, i have never had a bad day at mt hood pond. but speaking of carp, blue lake is the spot.