Forrest and Bird have lodged an appeal against the recent High Court decision which allowed for the Smedley land swap so the Ruataniwha dam could go ahead.
Last year the environment group sought a judicial review following the decision made by Department of Conservation's director general Lou Sanson to swap 22ha of the Ruahine Forest Park for 170ha of land the HBRIC will potentially buy from Smedley Station.
Forest and Bird solicitor Sally Gepp said the notice of appeal was filed today.
She said the main reason for the group's appeal is that it believes that the High Court was wrong to find that a decision to revoke the status of specially protected land in order to enable it to be given away in a land swap deal.
"This decision if it stands would set a precedent for all of of the specially protected conservation land throughout New Zealand," she said.