• Atlantic Ocean beach at Cape Cod National Seashore

    Cape Cod

    National Seashore Massachusetts

There are park alerts in effect.
show Alerts »
  • Nauset Marsh Trail Footbridge Temporary Closure After Labor Day

    A small footbridge on the Nauset Marsh trail will be closed for repair for two weeks following Labor Day. Ask at the visitor center for detour information.

  • Sections of Boardwalk Closed at Red Maple Swamp Trail

    Sections of the boardwalk at the Red Maple Swamp Trail have been closed due to structural deterioration and safety concerns. Check at Salt Pond Visitor Center for the current status of this trail, and for your safety, remain out of closed areas.

Water Quality

Water quality data collection

Two Student Conservation Association interns collect water quality data at Spectacle Pond in Wellfleet.

Photo by Naomi Blinick

Natural resources in National Park Service units are facing unprecedented challenges. Water quality of aquatic ecosystems within Cape Cod National Seashore are threatened by the combined effects of climate change, adjacent development, mercury deposition, acid rain, oil spills, and visitation by the public. An increasing proportion of the 5 million annual visitors to the park use the salt and fresh-water resources for swimming, fishing, boating and other recreational activities, and there are many private homes with individual septic systems that contribute nutrients to the adjacent waters.

In freshwater kettle ponds, increased nutrient inputs can lead to algal blooms, low oxygen in the water, and changes in thermal layer formation. In brackish and salt waters, nutrient enrichment leads to a cascade of events, including algal blooms, low oxygen conditions, loss of seagrass meadows, and fewer invertebrates and fish. Changes in climate, as well as mercury and other particles deposited from the atmosphere through wind and rain, contribute to declining water quality across the region. Monitoring water quality of aquatic resources aids in developing management strategies for protection and mitigation by identifying the source and level of impacts to a given ecosystem.

Did You Know?

Marconi Wireless Station, circa 1903

In 1903, Guglielmo Marconi transmitted the first transatlantic wireless message from the United States to Great Britain from Cape Cod.