The Clark's Fork of the Yellowstone River is named after William Clark of the Lewis and Clark Expedition.
The headwaters of the Clark's Fork lie near Yellowstone National Park.
In 1990 the Clark's Fork was given Wild and Scenic classification.
The small community of Clark lies at the mouth of the Canyon. Clark has an
elementary school, a recreation center, and a fish hatchery. The only commercial
establishment is Edelweiss, a small bar and convenience store.