The refuge protects the lower Carmans River, which is one of the few remaining pristine river corridors on Long Island.
It provides essential habitat for the endangered northern long-eared bat.
The refuge was established in 1966 through the donation of 1,800 acres of land by Maurice Wertheim.
The site features a specialized fish ladder designed to allow river herring and alewife to migrate upstream to spawn.
It is a key part of the Atlantic Flyway, hosting thousands of Canada geese and various duck species during migration seasons.
The refuge includes rare pitch pine-scrub oak barrens, a fire-adapted ecosystem unique to parts of the Northeast.
Wertheim National Wildlife Refuge is a 2,550-acre protected sanctuary on Long Island centered around the Carmans River, a federally designated Wild and Scenic River. The refuge encompasses a diverse range of habitats including oak-pine woodlands, grasslands, and salt marshes. It serves as a critical stopover for migratory waterfowl and provides a breeding ground for a variety of avian species. Visitors can access the refuge via several miles of trails that traverse these varying ecosystems. The site acts as a major ecological anchor for the Peconic Estuary system. It is one of the largest remaining undeveloped tracts of land in Suffolk County.
The elevated observation deck overlooking the Carmans River marshland.
Bring binoculars to scan the marshes for osprey and egrets, which are frequently spotted from the elevated boardwalks.
Wear insect repellent, especially during the warmer months, as ticks and mosquitoes are prevalent in the marshy areas.
Stick strictly to marked trails to avoid damaging sensitive nesting habitats.
Do not attempt to walk off-trail, as the terrain can be muddy and prone to dense undergrowth or ticks.
The visitor center and certain trails may have limited access or closures during specific nesting seasons; check local signage upon arrival.
Carry-in, carry-out trash policy; pets must be leashed; stay on designated trails to protect fragile ecosystems.
