 West St. Louis Creek is an aquatic research site within the 93 square kilometer Fraser Experimental Forest that is owned and managed by the U.S. Forest Service near Winter Park, Colorado. At an elevation of around 9,521 feet, this mountain creek is nestled within an evergreen forest that lies just west of the Continental Divide. Automated instruments collect physical and chemical properties of the stream, surrounding riparian area, in the atmosphere. Observational sampling of aquatic organisms and biogeochemical processes are also collected at West St. Louis Creek.