Just fished a Lake in BC over the 4th. We experienced very short spirts of Callibaetis each day and they may have lasted 10 minutes at the most. If you fished a chironomid emerger or cripple in the surface film it was red hot all day long. Their spring is up to 3 or 4 weeks late, damsels and dragons were just starting and the spring flowers were just going in bloom. This is one of the larger fish of the weekend my partner caught, weighed one at 8.5 lbs in the net.