Yarmouth Bridge is out of action after power cables operating it were damaged.
Contractors undertaking dredging work for Yarmouth Harbour Commission accidently damaged the cables, which now need to be replaced.
River users have been informed and will be kept updated while repairs are ongoing.
The road is not affected and remains open for vehicles and pedestrians.
Peter Hayward, Isle of Wight Council manager for highways and transport said: "The council is working closely with the harbour commission to make sure repairs are carried out as soon as possible.
"It is not a simple task to replace the power cables and requires specialist work including laying new cables on the harbour bed which will take time.
"I am sorry for this inconvenience to river users and hope to have power restored to the bridge as soon as possible."