Logan Cave National Wildlife Refuge in Benton County, Arkansas became the 455th National Wildlife Refuge on March 14, 1989, under the Endangered Species Act of 1973. This 123-acre (0.50 km2) Ozark Mountain refuge, which includes a limestone-solution cave, is located 20 miles (32 km) west of Fayetteville, Arkansas and approximately 2 miles (3.2 km) north of U.S. Route 412.