THURSTON COUNTY, Wash. -- The Thurston County Sheriff's Office on Saturday afternoon suspended its search for a 9-year-old boy and a 32-year-old man who have been missing since Thursday evening when a small boat overturned in the swift-moving Nisqually River.

Chief deputy Dave Pearsall said that the two are presumed dead.

Pearsall said about 40 searchers looked for more than eight hours -- from 6 a.m. to 2:15 p.m. -- on Saturday for both individuals with no success.

The body of the boy's 5-year-old brother was recovered Thursday night.

Pearsall said the searchers won't go out again Sunday, but planned to come back to the area on Monday and "look around" because the river's water conditions might change by then.

Tacoma Power said they have reduced the flow of the river at Alder and LaGrande dams to aid in the search.

"We're in a recovery mode now, not a rescue mode," Pearsall said. "We've exhausted our resources."

Searchers looked for 12 hours on Friday and six hours on Thursday evening after the boat carrying five people capsized just upstream from the Interstate 5 bridge south of Fort Lewis and east of Lacey.

VIDEO: Search Suspended For Two Missing Boaters
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The boat's operator, 42-year-old Vincent Farler of Olympia, and the boys' mother both survived by swimming to shore.

Farler was arrested for investigation of three counts of homicide by watercraft. Police said he was under the influence and driving recklessly.

Farler appeared in court Friday. According to court papers, a preliminary breath test measured Farler's blood alcohol level at 0.193, more than twice the legal intoxication threshold for operating a boat.

Bail was set at $75,000.

Valinda Reddoch lives along the river and witnessed the boat capsizing.

"I said can your boys swim? She said, 'No they can't swim, they're only five and nine,' said Reddoch, who asked if the boys were wearing life jackets." 'No.' She kept saying 'I'm so stupid, I'm so stupid.'"

Police said that no one onboard was wearing a life jacket. Under state law, a boat of that size should have carried a life jacket for each occupant and the children should have been wearing theirs, a sheriff's office spokesman told The Associated Press.

Matt Anderson watched the boat capsize and tried to save the boys.

"I ran down along the shore and caught up with them, jumped in and swam halfway across, but by then the kids were way down the river and there was nothing I could do," said Anderson.

The woman and her boys are from the Yelm area and the boys' father, who is a soldier stationed at Fort Lewis, is on duty in Iraq.