Upper Willamette System Fishing Report & Forecast Posted on June 2, 2022June 2, 2022 by Glenn Zinkus Detroit Reservoir Trout. Free Fishing Weekend – Willamette Valley Ponds. Alton Baker Canal: Alton Baker Canal was stocked this past week with 2200 legal size trout. As always, a great option for anglers and families... 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.