Call it a crawdad, call it a stonefly, call it ugly. But under water, with its rubber legs and its sparkle in the tail and thorax, it looks alive, in motion. Developed by Tod Ostenson for Rogue River steelhead, the Agent Orange is a great choice for a winter searching pattern on eastside rivers like the Deschutes, the John Day, the Grande Ronde and the Wallowa.

Use this pattern as the primary and hang a smaller nymph off the bend of the hook on a 12-inch dropper. Dead-drift the rig below a strike indicator (set 2X the depth of the run in fast water). Probe underwater ledges, transitions and seams. Set the hook at the slightest hesitation in the drift.

Tie with orange thread on a long wet fly hook. Slide a hot orange bead up against the eye. For the tail, use segmented rubber legs and Krystal Flash. Build the body with root beer yarn and rib with copper wire. For the thorax, use olive sparkle dubbing with rubber legs, grizzly gills and a wingcase of peacock sparkle chenille.