calsfoundation@cals.org
June 17, 2010
In 1832, Congress made the Hot Springs area in Garland County a federal reservation. When the springs were enclosed in 1901, the National Park Service diverted water to form a thermal water cascade, shown here, to create the appearance of a natural thermal spring. A blue-green alga (Phormidium treleasei) grows where the spring water is exposed to light and air.