Ice Slough

Historical marker location:

Jeffrey City, Wyoming

( Marker is on U.S. 287, 1.7 miles west of Happy Springs Rd, on the right when traveling west.)

Wyoming is home to the world's largest mineral hot spring, located in Thermopolis. The hot spring is named "The Big Spring" and produces over 3.6 million gallons of mineral water per day. The water is known for its healing properties and is used for therapeutic purposes.