The B-71 radar station also known as Klamath River Radar Station, Crescent City Radar Station, Trinidad Radar Station was a Army Air Force early warning station in World War II. It is a rare survivor of a World War II early-warning radar station. It was constructed as a disguise to look like a farmhouse. To guard against potential invasions, the U.S. Army built "farm" buildings, the cinderblock structures, complete with shingled roofs, and fake windows and dormers, housed an early warning radar station. From the air, the sea, and even the road, these buildings appeared to be part of a working farm. In fact, they housed a diesel generator, electronic equipment, and two 50-caliber anti-aircraft guns. One of 65 that was built all along the western coast of America during World War II. It is currently located on Coastal Dr. just south of the mouth of Klamath River.