Thematic Map: Catskill Creek Stream Access

More about Lewis A. Swyer Preserve...

The Lewis A. Swyer Preserve, situated 120 miles up the Hudson River, experiences significant daily tides that raise and lower the water level in Mill Creek by more than four feet. Frequent flooding has formed a rare freshwater tidal swamp, one of only five in New York State. The Nature Conservancy acquired the site from Conrail in 1989, and it was named after a former chapter trustee. Subsequently, the addition of two easements totaling over 500 acres has significantly bolstered the protection of this unique natural area. The preserve features a half-mile boardwalk that guides visitors through three distinct natural environments: a freshwater tidal swamp, a freshwater tidal marsh, and freshwater intertidal mudflats. The changing tides unveil diverse aspects of the preserve with each season, fostering a rich array of species in and around the swamp's waters.

Photo: Mill Creek
Photo: Boardwalk to the Hudson River Overlook
Photo: Mill Creek
Photo: East
Photo: Golden Ragworth
Photo: Fields of Skunk Cabbage
Photo: Boardwalk
Photo: Boardwalk to the Hudson River Overlook
Photo: Eastern Skunk Cabbage
Photo: Preserve Entrance [Expires May 24 2026]

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