Upper Willamette System Fishing Report & Forecast Posted on May 14, 2022May 14, 2022 by Glenn Zinkus Detroit Reservoir Trout and Kokanee. South Willamette Valley Ponds Alton Baker Canal: Alton Baker Canal was stocked this past week with 1750 legal size trout earlier this month. Alton Baker Canal will be stocked again... 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.