Here is the pattern for March 2010, The BWO. A good all early mayfly pattern for selective trout during our spring through summer months. I like fishing them on a dead drift through pools and eddies. The BWO pattern can be tied in different styles and shades to fit any anglers needs to fool trout.
The BWO (blue winged olive)

HOOK: 20 to 28 Nymph
THREAD: Olive Dun 8/0
BODY: Olive Dubbing
TAIL: Olive Dun Hackle fibers
HACKLE: Olive Dun
This is an simple BWO pattern tied in a traditional style. This pattern is used by a lot of people to catch trout on waters accross the country. The pattern can be tied in any shade of olive and a number of sizes to match your locals on the water.