Look for Blue-Winged-Olives to Hatch Sooon Posted on January 16, 2015 by Michael Teague Central and Eastern Oregon – Trout fishing has been fair to good on the lower Deschutes this week. Look for Blue-Winged-Olives to hatch anytime rain starts to fall. Fly fishers... 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.