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Hudson River Benthic Mapper

Exploring the Bottom of the River

Have you ever wondered what secrets lurk beneath the murky waters of the Hudson? A better understanding of the benthic area - the bottom area of the river - helps with the understanding of the movement of sediments, plants animals and their habitats. The bottom of the river features a wide variety of substrates. The Benthic Mapping Project was developed to find out more about the bottom of the river. Aerial photos can not penetrate the cloudy waters of the Lower Hudson so sonar systems and sediment samples were used instead to gather various information on depth, river-bottom contours, and sediment types.

The Benthic Mapper

Now by using Benthic Mapper some of this information is available to you to map, such as the contours along the floor of the Hudson or where different sediments occur.

Go Straight To The Benthic Mapper

Or you can use the links leaving DEC's website on the right hand side of the page to link to the maps data layers in the New York State Geographic Information Systems Clearinghouse.

Using the Benthic Mapper

The four sections of the Hudson available on the Benthic Mapper are: 1) a reach north of and including the Tappan Zee Bridge, 2) Newburgh Bay, 3) the reach from Kingston to Saugerties, and 4) the reach from the City of Hudson to the south end of Schodack Island.

About the Layers and Maps - What Benthic Mapper shows about the Hudson River

About the Hudson River Benthic Data - How the data are gathered; information about the data base

Viewer Help - Using the interactive map viewer, its tools, buttons and controls

Why Professionals Value This Information

The Benthic Mapping Project data provides a solid base for management decisions affecting communities and the Hudson River Estuary. Prior to the work of the Benthic Mapping Project the knowledge of the estuary floor was restricted to numerous sediment samples, but without the knowledge of other factors this information could easily be misinterpreted. The knowledge of the sediment profile and contours of the estuary floor along with the water movements above it give a more comprehensive picture. This more complete understanding of can be used in more successful habitat management, sediment and contaminant transport prediction, oil spill response, navigation, preservation or historic resources.


  • Important Links
  • Links Leaving DEC's Website
  • Contact for this Page
  • The Hudson River Estuary Program
    NYSDEC Region 3
    21 S Putt Corners Rd
    New Paltz, NY 12561
    fax: (845) 255-3649

    845-256-3016
    Send us an email
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  • Page applies to Hudson River region