Tivoli Bays - Hudson River Reserve, NY

Tidal Range

The Hudson is tidal freshwater at the Tivoli Bays, with an average tidal range of 3.9 feet.

River Flow

The Stony Creek drains into Tivoli North Bay and the Saw Kill drains into Tivoli South Bay. Tivoli North Bay's predominantly intertidal marsh has a well-developed network of tidal creeks and pools. A similar network of creeks and pools is beginning to form in Tivoli South Bay's shallows and mudflats.

Geology

Tivoli Bays lies in the Hudson-Mohawk Lowlands physiographic region. Bedrock is Ordovician gray sandstone and shale. Upland soils in the area are primarily derived from glacial till and Lake Albany clays. Soils at the site include muck, made land and a variety of loams, including silty clay, silt, fine sandy and gravelly loams. The bottom of the bays is largely soft muck, as much as 25 feet deep. The tidal swamp between North and South Bay has eight feet of peat overlying silt.