December Updates at Mashomack

©Jim Colligan

A Year in Review – Looking Back on 2021


Making Way for Water 

As our climate continues to change and temperatures and sea levels continue to rise, Mashomack is adapting. We have rerouted our trails away from the water and have removed the old yellow trail boardwalk along the back end of Miss Annie’s Creek to allow for rising seas.


Reducing Nitrogen in our Waterways

Mashomack has installed new, on-site septic systems that will treat and remove at least 80% of wastewater nitrogen. Over the summer, the Conservancy joined a local coalition of nonprofits and civic associations, called Shelter Islanders for Clean Water, in going door to door across Shelter Island to talk to residents about improving water quality. The Conservancy remains engaged with the coalition and we hope to see meaningful progress toward protecting water quality and Shelter Island’s aquifer in the coming year. If you’d like to learn more, visit


Trail System Updates

Our newly expanded trail system allows visitors to access more of the preserve, including our coastlines and meadows. New, bilingual signage and a new map are helping visitors find their way.


Reconnecting Kids With Nature

Mashomack’s Environmental Explorers program returned this summer. Kids spent their days exploring the preserve’s acres of meadows, forests, marshes and coastline. They participated in water-quality testing and meadow expeditions, learned about climate change, and discovered some of the many things they can do to help create a world where people and nature thrive.


Volunteer Workday Rescheduled

Our upcoming Mashomack Volunteer Workday has been rescheduled. We still need your help clearing leaves from the Manor House lawn so that they can be transported to Sylvester Manor for composting.

  • Date:
    • Sunday, 12/5, 11am-4pm: Leaf cleanup on the Manor House lawn
    • Inclement weather date: Saturday, 12/11, 11am-4pm
  • Space is limited
  • If you’re interested, please email by December 1stto reserve your spot


How Belize is Transforming the Caribbean

Belize just committed to protecting 30 percent of its ocean territory, with the help of the world’s largest debt-for-marine-conservation swap to date.


TRAIL HOURS: Trails open dawn to dusk, 7 days a week through December

In the month of January, Mashomack is open on WEEKENDS ONLY.

The Visitor Center and restrooms are temporarily closed.

During or following severe weather, we may need to close unexpectedly.

If the gate is closed, the preserve is closed. Please do not enter the grounds.



The Nature Conservancy works across New York, the United States and in 79 countries and territories to conserve the lands and waters on which all life depends. Learn more about our work at


Manor House Porch, Mashomack Preserve


Nature Conservancy

79 South Ferry Rd
PO Box 850

Shelter Island, New York 11964


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