The arrests are the most recent in a series of joint investigations by the Clark-Skamania and Cowlitz-Wahkiakum narcotics task forces.

According to a news release, agents obtained a search warrant for the Terry Robert Olson residence at 2801 Lewis River Road. With help from the Washington State Patrol SWAT team and members of the Cowlitz Meth Enforcement Team, agents secured the residence and outbuildings shortly after 7 a.m. Wednesday.

Agents said they located three suspects in the main residence and a fourth in a shop. They seized several ounces of suspect Methamphetamine, scales, ledgers, cash, 10 firearms (one was stolen, two were modified with silencers) and other evidence, the news release said.

Olson, 50, was booked into the Cowlitz County Jail on suspicion of possession of Methamphetamine with intent to deliver, operating a drug house, three counts of unlawful possession of a firearm and use of a firearm noise suppressor. Initial bail was set at $100,000.

Olson, a Minnesota native, has a 1982 conviction for second-degree assault in that state, according to court documents. He has lived in Woodland for seven years.

Also arrested:

Robert Dwayne Whitesel, 31, of Woodland was booked on suspicion of Methamphetamine possession, possession of a stolen firearm, and a misdemeanor warrant for a fishing violation. Bail: $25,000.

Donald Howard McElfish, 50, of Woodland was booked on suspicion of possessing Methamphetamine and Marijuana, with bail set at $15,000.

Brandon Charles Willis, 34, of Woodland was booked on a misdemeanor warrant for a fishing violation.