Roads, businesses and community buildings were submerged in water over the weekend as the River Calder burst its banks in Wakefield City Centre.
Chantry Bridge and Doncaster Road were closed due to flooding on Boxing Day evening after the river levels peaked. The bridge reopened on Sunday.
Wakefield Sea Cadets, who are based at nearby Thornes Lane, were among those badly affected.
Chairman Mark Pugh said: “Our unit at Thornes Lane was unfortunately flooded overnight on Saturday.
“Since early Sunday morning we started the process of the clean up as well as continuing our support to the local community in the form of a mail drop that we had already committed to.
“The unit unfortunately will be out of use until we are able to carry out some essential repairs to equipment and the building itself.
“Other community users of our facilities such as the Wakefield Philatelic Society are also affected.
“We have plans to temporarily move our training of cadets and we would like to thank all the local businesses, organisations and individual’s for the support we have received. We hope to be back to business as usual in the near future.”