Crane Prairie is a highly channelized reservoir with huge amounts of chironomids that help these rainbows reach their famed proportions. Strong hatches of damselflies during the summer supplement the chironomids.
Dry fly season is essentially over out here. Try fishing leeches on a slow strip or balanced leeches under an indicator. Balanced leeches have been surprisingly effective over the past couple weeks. You can also try baitfish patterns in the channels, especially around the spring creek tributaries such as the Deschutes. Small chironomids are an option as well. The season is drawing to a close but there is a bit of good fishing still to be had.