Initial extrapolations placed Cooper's landing area on the southernmost outreach of Mount St. Helens, a few miles southeast of Ariel, Washington, near Lake Merwin, an artificial lake formed by a dam on the Lewis River.[47] Search efforts focused on Clark and Cowlitz Counties, encompassing the terrain immediately south and north, respectively, of the Lewis River, in southwest Washington.[48][49] FBI agents and Sheriff's deputies from those counties searched large areas of the mountainous wilderness on foot and by helicopter. Door-to-door questioning, and searches of area farmhouses were also carried out. Other search parties ran patrol boats along Lake Merwin and Yale Lake, the reservoir immediately to its east.[50] No trace of Cooper, or any of the equipment presumed to have left the aircraft with him, was found.

The FBI also coordinated an aerial search, using fixed-wing aircraft and helicopters from the Oregon Army National Guard, along the entire route (the so-called "Vector 23") flown from Seattle to Reno.[51] While numerous broken treetops and several pieces of plastic and other objects that, from the air, resembled parachute canopies were sighted and investigated, nothing relevant to the hijacking was found.



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