Thousands of people took a dip in the Willamette River for the fourth annual Big Float on Sunday, July 27, 2014. (KOIN 6)

Photos: The Big Float 2014

An estimated 2,500 people took part in the annual Big Float from Poet’s Beach to Tom McCall Bowl Beach on Sunday.

Jennifer Huston, 38, was last seen in Newberg, Ore. filling her 1999 Lexus SUV, similar to the one pictured above.

Dundee mom gases up Lexus, vanishes

A search effort is underway to find Jennifer Huston, 38, who was last seen filling her tank at the Circle K gas station at 3101 Portland Rd.…