Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
Hellgrammites are the vicious larvae of the Dobsonflies, some of the only trout stream insects which pose a biting threat to the angler. The pincers of the adult are even more frightening that the larva's, and they're aggressive enough to use them once in a while.
This family's life cycle does not create good dry fly opportunities, but the larvae may be eaten by trout year-round. They are a secret told only by stomach samples of well-fed trout.
Cougmantx on Mar 9, 2008March 9th, 2008, 8:50 am EDT
Often times in March and April on the Colorado River north of Lake Buchanan in the Texas hill country, I will catch a bunch of Hellgrammies and fish them on a drifting line with a small split shot for channel cats. While I release most of them, often times I am stopped and asked what I caught them on. Since some of these fish will be in the 5 to 10 lb range it catches peoples eye. Their great bait for a channels, in swift water and clear rivers.
What really brings me to the area during these months is the White Bass and Stripper runs up the same river for spawn. I do alot of flyfishing for them. What brought me to this web site was trying to find a hellgrammite pattern that I might use to catch the channel cats when the bass fishing slows.
Hellgramite patterns can be simple or rather complex....here's one that I found on a steelhead site which I frequent. The wiggle-nymph style adds great action. Good Luck!