Public works officials say the ice is acting as a plug, and if there is a high tide and substantial rain, they fear the area could see water levels rise beyond normal.
Earlier this winter the city had to clear the parking lots downtown in fear of water breaching the stream.
"In a normal winter, we'll get a warm spell and the river ice will open up, and it will allow the stream to clear itself. It hasn't done that this year," says Dana Wardwell with Bangor Public Works.
The coast guard will be in the area Tuesday, taking a look at the stream and will decide then whether or not to break up some of the ice.