Producing over 120 million gallons of water each day, Big Springs a Natural National Landmark, is one of the 40 largest natural springs in the world. The springs create the headwaters of the Henrys Fork of the Snake River which travels across Fremont County creating spectacular scenery at Upper and Lower Mesa Falls. With a constant temperature of 52 degrees, the springs is home to rainbow trout, muskrats, ducks, moose and other critters. It is not unusual to see osprey and eagles dive for a meal of fresh fish from the springs.