Bighorn River Fishing Report February 2018: The fishing in Thermopolis, Wyoming on the Bighorn River is slow right now with not a lot of fish to the boat. The fish we are catching are nice and nothing beats a day on the river in February. Here is a quick little Bighorn River Fishing Report video from yesterday. Hope you enjoy! To see current water flows from Boysen Dam on the Wind River and Bighorn River click HERE.