The nature writer Harry Thurston has noted, "Almost before the last stone was put in place, sediment began to accumulate to an alarming rate - 5 to 14 centimetres per month.

"[5]: p43 Dr. Michael Risk of the University of Guelph, researching the build-up of a new mud flat on the seaward side of the causeway, "estimated that the bottom-dwelling creatures at Windsor were experiencing a two-thirds mortality rate", which led him to state the new formation was a "biological desert".

The need to monitor and assess the impacts of such changes gave impetus to a greater interest in Bay of Fundy ecosystem and the ultimate establishment of the Acadia Centre for Estuarine Research (ACER) in Wolfville.

They appear to be able to thrive on non-living organic matter..." and that this "abundance of creatures at the lower end of the food chain suggests a considerable nursery role for the inner Bay."

[5]: p43-44 Recently announced plans for the expansion of Highway 101 between the Halifax Regional Municipality and the eastern end of the Annapolis Valley have raised concerns about maintaining the Avon River causeway.