This was a teepee that was built, in 1909, to vent the steam from the hot springs.  The minerals flowing down the sides have built up this formation.  It was pretty cool to look at!  Hot water coming out the top, frozen streams down the side and steam coming off the whole thing. It is about 20 times the size of the origional Teepee which is encased in the minerals!  About 16 million gallons of water at 135 degrees f flow each day out of the ground in different places and then into the river.  They used to use the water for heating the town but all the pipes corroded and scaled up.