he Clark Fork River holds a significant place in Montana's natural and cultural heritage, serving as the largest river in the state by volume and one of its longest. Originating south of Grant-Kohrs Ranch, where Silver Bow Creek and Warm Springs Creek converge, the river extends over 280 miles to the Idaho border, making it a vital part of the region's ecosystem.

The diverse riparian habitat along the Clark Fork River supports a rich array of wildlife, with over 35 species of mammals and more than 230 species of birds making their home or passing through the area seasonally. Observing beavers, muskrats, river otters, moose, deer, ospreys, eagles, ducks, and other wildlife is a common sight along the river's edge.

For anglers, the Clark Fork River offers excellent fishing opportunities, with rainbow, cutthroat, and brown trout being the primary species found in its waters. Both bait and fly fishing are permitted, with a valid Montana fishing license required for anglers aged 15 and older. Fishing access within the park is limited to walking in, and visitors can obtain trail maps from the visitor center.

Throughout history, the Clark Fork River has played a crucial role in sustaining Native American tribes, supporting ranching activities, and facilitating exploration and settlement. However, industrial activities such as copper mining and smelting upstream in Butte and Anaconda have led to environmental challenges, including the contamination of the river with toxic sediments.

Designated as a Superfund Site in 1992, efforts have been underway to address the environmental impacts and restore the health of the Clark Fork River. Remediation work, including the removal of contaminated soil, stabilization of eroding banks, and re-vegetation of riparian areas, has been ongoing to mitigate the effects of past industrial activities and preserve the river's ecological integrity for future generations.