The sign reads:
"For much of its 315-mile course, the Hudson River flows straight and broad. But at the Highlands, the Appalachian mountain chain intersects the river to create a fifteen mile stretch of rugged, mountainous landscape. This area contains the river's narrowest and deepest points, as well as its fastest currents. The Hudson River is an estuary, a mixture of salt and freshwater, and the saltwater line extends just north of Beacon. The River is tidal all the way up to the Troy Dam above Albany."
website and more . . .
More Hudson Valley Audubon | Birding | Bird Watching