Updated December 1. 2017, 4:49 p.m.
The Rockford Fire Department says the man they were looking for in the Rock River Thursday night is alive and uninjured.
Division chief Matt Knott says after an extensive search, a man was located matching the description of Thursday night's water rescue victim was found at home. After questioning the man, Knott says it is believed that he is the man that prompted the river search.
The man is alive and uninjured. He was taken to the hospital for a check-up.
Updated November 30, 2017, 5:59 p.m.
UPDATE: ROCKFORD, Ill. (WIFR) - Fire crews have switched to recovery mode in the search for a man witnesses say fell into the Rock River.
Crews say the water temperature is around 40 degrees, which means it only takes about 4 to 6 minutes of being under the water before you are at risk of dying.
Crews on the scene tell us the water temperature was around 40 degrees. That means it only takes about 4-6 minutes of underwater exposure before the situation can become fatal.
The location makes this a risky search for divers.
"When we get this close to the dam, the water is high, the current is fast, the visibility is next to zero so it's a very dangerous operation," says Rockford Fire Division Chief Matthew Knott.
Updated November 30, 2017, 5:29 p.m.
UPDATE: ROCKFORD, Ill. (WIFR) - Several divers continue to search 40-degree water for a man witnesses say fell into the Rock River.
Rockford fire crews say at the current water temperatures a person die after just over an hour.
Crews say they will soon switch to recovery mode when the man is presumed dead from the cold water temperatures.
Divers say at this time the current in the river is strong and visibility is poor. Crews say they plan to use sonar technology to search for the man.
Posted November 30, 2017, 5:07 p.m.
ROCKFORD, Ill. (WIFR) - The Rockford Fire Department is searching the Rock River for a man.
Crews are searching the river just south of the Chestnut Street Bridge. At this time it is not clear if the man jumped into the water or fell in.
We will continue to update you as we learn more about this incident.