The swing bridge needs work say the county council Pic: shabbagaz
The swing bridge in the Docks is to be closed to cars and cyclists during late March.
No traffic will be allowed along Navigation Way from its junction with Ferry Road to where it meets Maritime Way.
Lancashire County Council says essential maintenance needs to be carried out on the swing bridge.
The road is to be closed from 9am on Wednesday 23 March to 3pm on Sunday 27 March.
An alternative route for all traffic is Navigation Way – Mariners Way – Port Way – Navigation Way and vice versa.