UPDATED, Wed April 30:  The opening of the $7.3 million Clarrie Hall Dam has been rescheduled for May 22, so the newly appointed NSW minister for natural resources, lands and water, Kevin Humphries, can attend.

Tweed council GM Troy Green said the council was delighted the event would be among the minister's first formal engagements.

"This is a fantastic opportunity to show off the great work being done by local government in Northern NSW," Mr Green said. 

INITIAL report, April 22:  CLARRIE Hall Dam will reopen to the public next month after the completion of its $7.3 million upgrade.

Members of the community have been invited to the opening on Thursday May 1.

Tweed mayor Barry Longland will officially reopen the site, along with NSW Minister for Primary Industries Katrina Hodgkinson.

The NSW Government contributed $1.2 million to the upgrade, which increased the dam's spillway capacity to ensure it could safely pass extreme flood events.

The council's director of engineering David Oxenham said the upgrade has expanded the spillway structure and raised the wave wall across the dam's crest, ensuring the safe operation of the dam in extreme rainfall events.

"New recreation facilities and Indigenous signage have also been installed as part of the upgrade and will be unveiled at the ceremony," Mr Oxenham said.

"The facilities will enhance this picturesque location as a sport for public recreation, while signage will further recognise the local area's significance for indigenous culture."

Clarrie Hall Dam Rd and the land surrounding the dam wall has been closed to the public for more than a year.