The small village of Warm River, where Three Rivers Ranch is located was named after the river that winds through the area and stays a constant 50 degrees year round. Warm River is spring fed, making it a clear, excellent river to find trout. The river is a tributary to the Henry’s Fork of the Snake River and offers fisherman an excellent opportunity to catch good sized trout. A fish observation platform located in Warm River gives visitors an up close opportunity to see and feed many large trout. Stone Bridge access located one mile downstream from the observation platform is the launching point for fishermen to begin their float trip of the lower Henry's Fork.