Essential work to nourish the beach and improve the sea defences at Cleveleys is due to start on Monday.
Extra sand and shingle needs to be added to the stepped areas and some groynes will be extended to address potential erosion.
Council bosses say both of these together will ensure the long-term effectiveness of the sea defences.
When they were first built, the tide was expected to deposit enough natural material at the base of the steps to protect the foundations.
This has happened in one or two places, but elsewhere the steel piles are becoming exposed at the foot of the steps where they meet the beach.
As a solution, excess sand and shingle is being brought in from Fleetwood and will be used to raise the level of the beach against the steps.
This will taper down towards the sea to make a natural slope, which in turn should reduce the depth of the waves and make the promenade safer at high tide.
At the same time the wooden groyne next to the cafe and three groynes south of this will be extended in rock to reduce the erosion effect of the tide.
The work is expected to last for nine weeks and will be carried out by Birse Civils.
They will be based in a compound next to the five bar gate on Rossall Promenade.
This will mean the temporary loss of parking space, but council bosses say it will improve safety.