The muskrat show was on the left in the Missouri River. After it was over, we continued eastward. The fish hatchery part is just over there. The Springs has been carbon-dated to be about 3000 years old.

The conduit between the mountains and the spring is the geological stratum found in parts of the northwest United States called the Madison Limestone. Although some of the underground water from the Little Belt Mountains escapes to form Giant Springs, some stays underground and continues flowing, joining sources from losing streams in the Black Hills, Big Horn Mountains and other areas. The aquifer eventually surfaces in Canada.