Willamette, McKenzie & Santiam Rivers Fishing Report Posted on August 13, 2015 by Michael Teague The latest water temperature reading at Willamette Falls was 76 degrees but that was nine days ago. Does anyone care? Neither do the data gatherers. Unless you’re warm water fishing... 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.