The spring outlet is located in Giant Springs State Park, just downstream and northeast of Great Falls, Montana on the east bank of the Missouri River. Giant Springs was first described by Lewis and Clark during their exploration of the Louisiana Purchase in 1805.
Before that, the Blackfeet people utilized the springs as an easy-to-access water source in the winter. The springs were mostly ignored by settlers until 1884 when the town of Great Falls was established and the springs became the place for Sunday recreational activities. In the mid-1970s the park was established as a Montana State Park.
Today, some of the spring water is bottled annually for human consumption and some of the discharge is used for a trout hatchery.
The hatchery is a Montana state trout hatchery named Giant Springs Trout Hatchery and raises mostly Rainbow Trout. The spring serves as the headwaters of the 200-foot (61 m)-long Roe River, once listed as the shortest river in the world according to Guinness Book of World Records. The river flows into the Missouri River which is near the spring and borders it’s state park.