Visitor takes a walk at Badwater, lowest point in North America El. 282 ft (86 m) below sea level. Badwater Basin is an endorheic basin (no outflow). Average annual precipitation is 1.58 inches (40 mm). Base of Panamint Mountains in background. Death Valley National Monument Est. February 11, 1933; Death Valley National Park in 1994. 5,270 square miles (13,649 km2). Inyo County, CA.