PORTLAND, Ore. -- Four people were rescued after a fishing boat capsized and sank in the Columbia River on Friday morning. One person later died at a Portland hospital.

The four people were technicians on a research boat for the Columbia River Inter-Tribal Fish Commission, according to a Facebook post from the organization. The boat flipped over near Multnomah Falls and three men and a woman were clinging to the bottom of it as it floated down the river, the Multnomah County Sheriff’s Office said.

A driver on Interstate 84 spotted the boat and called 911.

The boat sank and all four people were left floating the water, according to Lt. Chad Gaidos.

All four people were wearing lifejackets.

A Gresham Fire boat arrived and rescuers pulled all four people to safety.

A LifeFlight helicopter flew to the scene and took one person to a Portland hospital. That person later died at the hospital.

Three other people were taken by ambulance to a hospital. All three were suffering from hypothermia, Gresham Fire said.

Gaidos said very rough water conditions were likely a contributing factor to the incident.