The Clark Fork is one of the longest rivers in Montana, stretching more than 280 miles from its rise as Silver Bow Creek in Southwest Montana to the Idaho border. For its entire length in Montana, Interstate 90 roughly parallels the river.

The Clark Fork and its tributaries are among the most popular destinations for fly fishing in the United States. Other popular water recreation on the Clark Fork includes floating, SUPing, rafting, kayaking and even river surfing.