April brings some of the best dry fly fishing of the year for people that are willing to put the time in on the water.  Not every day will be lights out since the conditions are much more variable than they are in the heat of summer, but there are far less anglers and the fish can be a bit more reckless as the water warms and their metabolism rises.  With the extended winter we're having, blue wing olives (BWOs) will be on every moving body of water, and March Browns will be present on riffly waters like the middle and lower Deschutes, Willamette, and Mckenzie rivers.  Skwala stoneflies will also be around during the first part of the month, and can be an early opportunity for a size 8 dry before the more famous salmonflies and golden stones of May/June.  Speaking of those chunky stones, their nymphs are going through their last phases underwater before they begin to emerge and will be very common in the drift for places with large stonefly populations like the middle and lower Deschutes.  You can also find very localized groups of salmonflies around spring influenced areas on a few rivers this time of year, but it's not common.  Redband and largescale/bridgelip suckers will be spawning, so an egg pattern is a good searching nymph as well.  Small size 12-16 attractor mayfly nymphs and dries on the middle Deschutes can be very productive this time of year, especially when irrigation season starts later in the month.  The Metolius has a cornucopia of opportunities as usual, with cinygmula mayflies (which are functionally pale morning duns), BWOs, a few March Browns, various caddis on the warmer days, as well as staples like midges and golden stonefly nymphs.  The lakes will open April 22nd, and access will vary, but leeches and chironomids/midges are about the only bugs brave enough to be active early in the season.  Water temperature plays a big part in how active the fish are.  Typically on the lakes it's more about finding fish that are feeding than matching any specific bug this time of year.  It may be frustrating some days, but the only way to not put yourself in a position to catch fish is to not go fishing!