Ground Search
The initial ground search began on Friday, November 26, 1971 in the early afternoon. Approximately 20-25 Clark Country Sheriff Deputies and local volunteers from the fire department searched along Cedar Creek Road, west of downtown Amboy, WA.
They searched all weekend, but rain and darkness limited the scope of the investigation. It wasn't light enough to search safely until 8:30 am, and it had to wrap up by 4 pm.
Although LZ-A was estimated to be 3-4 miles wide and 5-6 miles long, only about one square mile along Cedar Creek Road was examined before the ground search was terminated four days later by the FBI on Monday, November 29, 1971. At that point the FBI put all their resources into the V-23 aerial search from Seattle to Reno.
In March, 1972 the Feds came back with 200 troopers. SA George Grotz told me about 20 FBI agents accompanied the soldiers into the woods. They searched throughout the Amboy area for two weeks, then stopped due to weather concerns. They returned in early April for another two weeks.
However, there was a selective ground search throughout Amboy in late November - early December 1971, as best as I can determine from residents. Lots of agents conducted a very thorough search of homes, barns, outbuildings and such. I don't know when it concluded, but I suspect it didn't last longer than a week. Himms would know. He wrote about it a little.