Valley floor with patterns from migrating water and passing clouds from a clearing winter storm. Average rainfall of only 1.58 inches (40 mm). View from Dante's View (5,500 feet (1,700 m) above sea level). Death Valley National Monument Est. February 11, 1933; Death Valley National Park in 1994. 5,270 square miles (13,649 km2). Inyo County, CA.