BASED ON MY first few attempts, I assumed that suffering was essential to catching steelhead on Great Lakes tributaries. Those early trips, made between December and March, left me with numb extremities, ice-clogged guides, and few, if any, fish. That’s why, during the first week of May a few years back, I almost felt guilty wearing short sleeves while fighting my umpteenth steelhead. A few months prior, during a frustrating midwinter trip to the Salmon River in New York, the clerk at Whitaker’s Sport Store took pity on me and said, “If you really want to catch them good, come back in the spring for the dropbacks.” He was referring to the post-spawn steelhead in the process of returning—or dropping back—to Lake Ontario. After a winter of limited feeding opportunities,…