Bugs on the Big Horn. Want to learn more about how to fly fish, take your skills to the next level or just hang out with some cool fishy folks? Join the Thermopolis Trout Unlimited crew! This month is a great opportunity to get a sneak peek at our year-round calendar of events. We'll also be reviewing the Big Horn River hatch chart so you can be ready for our local bug hatches. We'll wrap things up by looking at this years upcoming fly-tying series, where we'll teach you how to tie some of the most productive flies for our local waters.