Updated 5/29/2019. The flows of the Big Thompson through the park have been changing based on the weather. The warmer days will cause snow melt and water levels to rise. On colder days, the flows will be lower. Small dries, such as a Griffith’s Gnat or a Parachute Adams, work in foam pockets. Try the Electric Caddis, San Juan Worm, and Copper John for sub surface options. This is a great time of year to be swinging a streamer under a cut-bank.