The Massachusetts Bay extends for over forty miles from Cape Ann in the north to Plymouth Harbor in the south on the eastern coast of the Commonwealth. It is a major feature of the North Atlantic Ocean and is part of the greater Gulf of Maine ecosystem. The most prominent submerged feature within the Massachusetts Bay is the Stellwagen Bank on its eastern edge, which is a shallow, mostly sandy plateau that curves from northwest to southeast for about nineteen miles. Established in 1992, the Stellwagen Bank National Marine Sanctuary conserves submerged shipwrecks and protects populations of whales and commercial fish. Within the Massachusetts Bay is the Boston Bay. And within the Boston Bay, enclosed by Deer Island to the north and the wide arm of Hull to the south, is the interior of Boston Harbor, a famously complicated navigational harbor with shallow channels, many of the Boston Harbor Islands, submerged bars, and—in places—strong currents. The entire harbor is relatively shallow, on average less than twenty feet deep, and so to maintain its commercial viability it is routinely dredged in key areas to maintain suitable depth for large craft. The main channel that runs through President Roads between Deer Island and Gallops Island, then into the Inner Harbor and Mystic River Basin industrial port is maintained by dredging to support container ships. The Boston Harbor Deep Draft Navigation Project is dredging the channel to 47 feet depth. For much of the past four centuries the harbor has been indiscriminately used as a dumping spot for detritus and human waste, leading to its reputation in the 1980’s as the “harbor of shame.” The Harbor Islands were used as landfills, horse-rendering plants, quarantine hospitals, prisons, internment camps, and other activities unwanted on the mainland. That all changed in the 1980s with a court – ordered cleanup and the establishment of the Massachusetts Water Resources Authority, which oversaw the Boston Harbor Cleanup and the construction and operation of the Deer Island Wastewater Treatment Plant, which maintains clean harbor waters today. Since the cleanup, Boston’s downtown “central artery” highway was moved to an underground tunnel and the Rose Kennedy Greenway was created along the downtown waterfront, and redevelopment has placed recreational and scenic values of the harbor as a centerpiece. The cleanup has also led to significant improvements in water quality and marine ecosystems and species. Heavy metals and other long-lasting, heavy pollutants remain in the harbor floor sediments, however, and shellfishing and groundfishing remains closed due to public health concerns. |
Last updated: November 3, 2021