Environmentalists are hailing a decision to remove a causeway that has partially blocked New Brunswick’s Petitcodiac River for nearly 50 years. The provincial and federal governments have announced a 61.6-million dollar project to remove a 250-metre section of the causeway and replace it with a four-lane bridge. The causeway links Moncton and Riverview. But it also blocks a habitat for fish to spawn and stifles the river’s famous tidal bore — the large wave that rolls in when the tide is on the rise in the nearby Bay of Fundy.