MWS hosted members of the Anacostia Watershed Society, who were collecting submerged plants to transplant to the Anacostia River. In a regional irony, Mattawoman is slated to have the same level of development as the Anacostia does now. This high level of development has degraded the Anacostia to such a point that it lacks the native Wild Celery that is being transplanted. See news story here.