The Klamath River Radar Station B-71 in Redwood National Park, California, is a rare survivor of a World War II early-warning radar station, the first step toward the more sophisticated and pioneering early-warning radar defense network. Rather than using camouflage materials, the buildings of Radar Station B-71 were constructed to resemble farm buildings to disguise their true purpose. The station consists of three buildings: a power building disguised as a farmhouse, an operations building disguised as a barn and a functional wood frame two-stall privy or outhouse, now a partially collapsed ruin. The two major buildings were constructed for the Army by a private contractor specifically for the early warning aircraft station, and consist of block walls roughly two feet thick covered with wood-framed gable roofs with wood shingle finish. - NPS