These two maps show the decline of eelgrass in Casco Bay over just four years. In 2018, Casco Bay’s eelgrass was mapped by Maine Department of Environmental Protection, revealing an extensive network of eelgrass beds. But four years later, when mapped again in 2022, 54% of all eelgrass beds in Casco Bay had disappeared – a huge loss in a short amount of time.
Maine’s Department of Environmental Protection eelgrass mapping has been invaluable and revealed a need for more frequent and regular mapping. Maine DEP had temporary funding for the 2018 eelgrass mapping. Soon afterward, Friends of Casco Bay helped to pass a bill that now funds the mapping of eelgrass across the entire Maine coast in five year cycles. This enabled the 2022 eelgrass mapping that revealed such significant loss of these essential habitats.

Maine DEP 2018 and 2022 Eelgrass Mapping

Maine DEP 2018 and 2022 Eelgrass Maps