With rising sea levels and increased potentiality of one hundred-year storms, the Town of Stonington in Southeastern Connecticut is concerned for the future of Mason’s Island Causeway, the only point of access and egress to Mason’s Island, an island located in Mystic Harbor. The Town requested that a team of UConn students assess the situation using the skills acquired through education and internship experiences, and to propose and design a solution. Throughout the course of the project, various options and limitations were examined and analyzed. The assessment determined that the best course of action would be to raise the existing causeway and widen the lanes to accommodate the populations of pedestrians and bikers. The primary limitation was the lack of alternative routes of entry/exit to and from the island. To accommodate this, the team has decided that renovation of the causeway must be completed in phases to allow one lane of travel at all times. The renovation efforts will also place a focus on improving/expanding upon the existing green infrastructure, as its inclusion in design can positively impact erosion, water quality, and overall health of Mystic Harbor.