The loss of the bridge is expected to cause traffic delays and safety concerns.
The bridge crosses a portion of Graham Lake, and without it, a commute into the city requires a 40mile detour.
The bridge will remain closed for up to ten days, while a temporary bridge is put in place.
Public safety crews will be posted on the north side of the bridge to handle emergencies.
Some local folks have already staked out a two mile road across the ice on the lake, to get around the bridge, but Ellsworth Fire Chief Jon Marshall says that he is concerned about that.
The chief says cars could go through the ice, or have other accidents, and it would take longer to respond to emergencies out on the lake.
The city will be putting up signs to discourage people from using the ice as a crossing.