Upper Willamette River System Fishing Report and Forecast Posted on August 11, 2022August 11, 2022 by Glenn Zinkus Willamette Steelhead In The Upper River. Middle Fork Willamette For Trout. Detroit Reservoir Trout. Alton Baker Canal: Alton Baker Canal was stocked with 900 legal size trout. As always, a great put and take... 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.