Haystack Reservoir is an easy drive from Bend or Sisters and offers good bank wading access, or float tube or boat access to this good reservoir. Haystack is stocked with brood rainbows and is a place where you might find a real trophy in your net. Usually an indicator with a balanced leech (black with an orange or chartreuse bead or olive with an orange bead) is about as good as it gets. Add some chironomids like ice cream cones and chromies too.
A lot of good fishing can be done here with different sinking lines so don’t forget to bring at least an intermediate camo, type 3 and maybe a midge tip or hover.
With warm days keep an eye on some callibaetis hatches starting and cross your fingers for that.