Mark Engler’s WD-40 Nymph

Mark Engler’s WD-40 Nymph Over the past 20 odd years, the WD-40 nymph has rose to prominence as one of the most effective flies for catching midge and blue winged olive eating trout.  Across Colorado and the Rocky Mountain west, the WD-40 is a simple fly that many a tailwater guide has come to rely on.…