Upper Willamette System Fishing Report and Forecast Posted on September 1, 2022September 1, 2022 by Glenn Zinkus Green Peter Kokes. Detroit Lake Kokes. Upper McKenzie Trout. Middle Fork Willamette Trout and Steelhead. 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.