Boulder River (Sweet Grass County, Montana)

The Boulder River is a significant tributary of the Yellowstone River, located in Sweet Grass County, Montana. Originating in the Absaroka-Beartooth Wilderness, the river flows north, carving a scenic valley renowned for its recreational opportunities, including fishing, hiking, and camping. The river's course is characterized by a mix of fast-moving rapids and calmer stretches, supporting a healthy population of trout, primarily brown trout and rainbow trout. The Boulder River is a popular destination for fly fishing. The surrounding landscape is a mix of forested areas, meadows, and rugged mountains, contributing to the river's aesthetic appeal and ecological importance. The river's watershed also provides essential habitat for a variety of wildlife, including deer, elk, and bears. The Boulder River's water is used for irrigation in the agricultural lands along its course.