Upper Willamette Fishing Report and Forecast Posted on September 30, 2021September 30, 2021 by Glenn Zinkus Detroit Reservoir and McKenzie River Trout. Lower Willamette River: Coho are starting to ascend Willamette... 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.