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Discovered by the Lewis and Clark Expedition in 1805 and one of the largest freshwater springs in the world. Giant Springs flows at a measured 338 million gallons of water per day. You can picnic by the Missouri River, visit the fish hatchery and visitor center, walk along the Rivers Edge Trail and view the nearby Rainbow Falls overlook.<br><br><b>Directions:</b> 1 mile east of U.S. 87 on River Drive, Great Falls. |