"On July 8, 1847 40 year old Wilford Woodruff took a much needed rest at Fort Bridger, Wyoming as he journeyed west. After breakfast, he took the fly rod, reel, line and artificial flies he had obtained in England and went fishing on the Black Fork of the Green River just outside the fort. This is the first recorded evidence of a native Rocky Mountain trout being caught on a fly rod, and the first recorded use of a fly rod and artificial fly west of the Mississippi River".
This is the story depicted in the painting
"First Fly" by Dix Baines