Columbia River Fishing Report and Forecast Posted on May 14, 2015 by Bob Rees Columbia River Fishing Report – It’s certainly an attractive option, to be able to fish the mainstem Columbia in the middle of May for spring Chinook but as it typically... This post is only available to Members. If you are a Member, please be sure to log in. You can do this on the top right of almost any page on our site. If you want to become a member or find out more, take a look here.