The South Teton River is a 22.8-mile tributary of the Henrys Fork Snake River flowing through Fremont and Madison Counties in Idaho. This smaller waterway drains the western slopes of the Teton Range and receives regular stocking of rainbow trout, making it an accessible fishing destination for anglers of various skill levels. The river benefits from both snowmelt and spring-fed sources, creating cold, clear water conditions that support healthy trout populations throughout much of the year.