This natural lava bridge is located in El Malpais National Monument in Cibola county, New Mexico, USA. It was fromed by the collapse of a long basalt lava tube which came from Bandera Crater. The bridge has a span of 51 feet (15.5 meters). Big Lava Trailhead is located 35 miles west of Grants. NABSQNO 12S-764744-3870878