Here is a good example of how a simple project like a new bridge can have serious. unintended consequence. This is at Cape St. Mary and the Mavillette Beach Provincial Park. A bridge was built across the feeder connection to the back marsh opening up a new channel. Now, incoming tides have enough energy to move the beach sand from Mavillette Beach into the marsh. Once tidal energy is used up the sand drops out. Don’t know the original source of Mavillette Beach sand but it is not enough to overcome loss to interior. However, that sand in marsh won’t get moved back to the beach. Hopefully the beach opening will be closed.