On 16 June 2006 , the French prime minister and regional authorities announced a $ 164 million project ( Projet Mont-Saint-Michel ) to build a hydraulic dam using the waters of the river Couesnon and of tides to help remove the accumulated silt deposited by the rising tides , and to make Mont Saint-Michel an island again .
On 16 June 2006 , the French prime minister and regional authorities announced a $ 164 million project ( Projet Mont-Saint-Michel ) to build a hydraulic dam using the waters of the river Couesnon and of tides .