Norfolk Wildlife Trust has confirmed its visitor centre in Cley has reopened following the weekend's floods.
However, motorists are being warned to stay away as the access road remains closed.
The nature reserve, which was devastated in the tidal surge, remains closed as staff attempt to uncover the full scale of the damage caused.
Wildlife was seen littering the site which has been polluted by sea water.
A statement from the National Wildlife Trust said: 'NWT Cley Reserve will remain closed today following the seawater flooding at the weekend.
'The visitor centre is open to walkers from 10.30am this morning serving tea, coffee and cake.'
But it added: 'Please note that the coast road remains closed in this area at the moment.'
While the visitor centre escaped any damage its bottom car park remained under water on Sunday and the neighbouring A149 Coast Road choked with debris.
In an earlier statement, the trust said: 'There is no doubt that there will be wildlife casualties, especially to the plant and invertebrate life on the reserve. It is impossible to say at this stage what the extent of the losses will be.
'This means that for a time there will be limited food available for the many species of birds and other wildlife that depend on the habitats for their survival.
'It is important, therefore, that the seawater is able to escape on the low tides as quickly as possible so that the freshwater habitats can recover.'
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