Upper Willamette System Fishing Report and Forecast Posted on May 4, 2023May 6, 2023 by Glenn Zinkus High Rivers. Detroit Reservoir Trout and Kokes. South Willamette Ponds and Reservoirs Trout. Alton Baker Canal: Alton Baker was stocked earlier this month with 1,250 legal size rainbows, and scheduled again to receive the 938... This post is only available to Members. If you are a Member, please be sure to log in and remember to select the Remember Me option. If you want to become a member or find out more, take a look here. If you are looking for our free content head here. And, if you need a hand, please reach out here.