Otter Creek Preserve is located along a three-mile stretch of coastline on the Long Island Sound and contains 90 percent of the remaining productive salt marshes in Westchester County.

The vibrant mix of coastal waters, marsh, wooded wetlands and uplands, vernal pool, and edge habitats, makes Otter Creek Preserve reserve an important site for migratory birds, marine life, insects, reptiles and amphibians, fish, and mammals.

The preserve offers significant passive recreation opportunities as it has a forested upland trail approximately three-quarters of a mile in length adjacent to the wetland. There is a seasonally active osprey nesting platform. The viewshed afforded from being nestled along the Mamaroneck coastline attracts birdwatchers (more than 100 species of birds have been recorded here), wildlife lovers, photographers, and botanists.

WLT acquired the preserve as part of a transfer from The Nature Conservancy in April 2015. The preserve is the largest privately-owned tidal wetland designated and protected as a nature sanctuary in Westchester County. It was also designated a Geologic Area of Particular Concern by the NY State Department of Environmental Conservation in 1978, and shortly thereafter, the Village of Mamaroneck declared it a Critical Environmental Area.