The Big Horn River in Thermopolis is a tailwater that is fishable year-round. Brown, rainbow, and cutthroat trout can all be found here. The average trout size ranges from 16-18 inches with some opportunities at 20"+ fish. We have trico, bwo, baetis, and caddis hatches throughout the spring and summer along with good terrestrial hatches which offers great opportunities to dry fly anglers. Typical tailwater bugs like sow bugs, midges, mayflies, caddis, and leeches often bring the most fish to the boat while nymphing.