The unidentified man was trying to anchor a boat Saturday morning, when the anchor's rope pulled him and a passenger overboard.
Investigators are searching for a missing boater who fell into the Missouri River near Ponca State Park in northeast Nebraska.
The Nebraska Game and Parks Commission says the unidentified man was trying to anchor a boat around 7:30 a.m. on Saturday, when the anchor's rope pulled him and a passenger overboard.
Authorities say the passenger climbed back into the boat and called the Dixon County sheriff's office. The passenger was treated for mild hypothermia.