Repair work is being carried out on Egremont Bridge.
The bridge, which is often battered by flood waters, is having minor works taking, said a county council spokesman.
Traffic lights are in place as work vehicles block one lane of the carriageway.
The works involve securing scour pockets and some re-pointing.
The council spokesman said work was expected to be completed by tonight.
Egremont Bridge has been closed several times over the past few years after flood waters battered the structure.
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