UPDATE: The Linn County Sheriff's Office says the possible drowning victim is believed to be Jairo Mejia Jimenez, 31, from Cedar Rapids.
The Linn County Sheriff’s Office is investigating a possible drowning at Palisades-Kepler State Park.
A man was swimming near the dam at the park around 7:30 Saturday night, when he went underwater and never resurfaced.
Emergency crews searched the area with boats and have not yet found anyone.