** 12. Know the hatches. From early to mid-spring, hatch lore is much simplified and easy to comprehend. In March and early April, the bluewing olive, or Baetis, mayfly is common throughout trout country. Baetis hatch on overcast afternoons, often during a drizzle or spitting snow. A No. 16¿¿¿18 Parachute Adams (A) matches this fly nicely. Another important and widespread early-spring mayfly is the larger March brown, which hatches from late morning to early afternoon. This fly is easily distinguished from the bluewing olive by its larger size, brown mottling, and raked-back wings. Imitate it with a (B) No. 14¿¿¿16 March Brown Thorax, (C) Hairwing Dun, or (D) Brown Wulff. **13. Search with streamers. Before and after hatches in cold, clear-water conditions, explore by dead-drifting a streamer along banks, seams, and the edges of runs. If that fails, activate the fly with flicks of the rod tip and short strips of the line. Good patterns include: (A) Woolly Bugger, (B) Clouser Minnow, (C) Muddler, and (D) Zonker, sizes 4¿¿¿8. Black, brown, and olive are productive colors; but when in doubt, choose something that matches the tint of the streambed.