Flood Watch issued due to Kankakee River ice jam risk

MOMENCE, Ill. - The fluctuating temperatures in the Chicago area are impacting local rivers and streams, raising the potential for ice jams.

As a result, a Flood Watch was issued Thursday afternoon for Momence near the Kankakee River.

What we know:

Residents along the Kankakee River typically face flood risks in January and February.

"Two days ago, the river was flowing good. Now it’s starting to ice up and you start hearing it cracking, so it’s definitely getting bad right now," said Kankakee county native Brian Scheppler.

"We haven’t seen it in a while because it’s been a little warmer (the winters) but now this winter seems to be a little colder, especially with next week coming, it's going to get bad."

The National Weather Service issued a Flood Watch for the river near Momence, effective until further notice, due to the threat of an ice jam.

The alert warns of possible flooding from an ice jam forming, which could affect those living along the riverbanks and upstream to the Indiana-Illinois state line.

"They are so forceful and so damaging, and there’s nothing you can do (but) pray for the sunlight to come out and have a good day of warmth," said Toni Vail, another Kankakee County local.

What is an Ice Jam?:

According to the NWS, an ice jam occurs when floating ice accumulates and obstructs the river’s flow, often near bends, tributaries, dams, or bridges.

The blockage can cause water to back up, leading to flooding or flash flooding upstream. If the jam breaks, flash flooding may occur downstream.

As of late Thursday afternoon, the river was 3.6 feet above flood stage. At 4 feet, low-lying riverbanks begin to flood, with the flood stage at 5 feet.

Residents who live and work near the Kankakee River will be keeping a close eye on the river for the next two to three weeks.