Asotin County Sheriff Ken Bancroft confirms the search is in connection with Rachael Anderson. The Clarkston woman went missing in 2010.
It's never been confirmed that Charles Capone, her estranged husband, murdered Anderson but he remains behind bars awaiting trial on murder charges.
This is the second time the boats have gone on the river looking for a body after a tip from local fishermen.
"Something wrapped in a tarp that came up with the anchor and broke free so that's what we've been searching for and we've narrowed it down to this one particular area," said Asotin County Sheriff Ken Bancroft. "And that's possibly where her body is."
While there are no divers in the water this week, the coast guard has brought side-sonar scanning to assist Asotin County Sheriff's deputies in the search. The search continues through Wednesday if necessary.