This was due to high tides, heavy rainfall and surge warnings in the area. Flooding is likely and there is a danger of flying debris overnight.
The road will be re-opened when Storm Callum has subsided.
The Irish Coast Guard has issued a warning to people in Waterford and all coastal counties as five Met Eireann weather warnings come into effect today.
The warning covering Waterford is Status Orange, warning of "south to southeast winds will gust to between 100 and 130 km/h, strongest at the coast. Along with a spell of heavy rain and high tides, there is a risk of some coastal flooding."
A Status Orange warning is in place for all coastal counties with a Status Yellow covering the rest of the country. The warning in Waterford is valid from midnight tonight until 9am tomorrow (Friday).
As a result, the Coast Guard has strongly advised the public to "stay away from exposed beaches, cliffs and piers, harbour walls and promenades along the coast during storm conditions.
"Remember to stay back, stay high and stay dry," they said.
If you see someone in difficulty in the sea, dial 999/112 and ask for the Coast Guard.