Maps

Highest ranking small watersheds that support high quality coastal habitat, natural resources and critical fisheries spawning and nursery areas in tidal waters and near-shore areas.

Physiographic provinces in the Chesapeake Bay Watershed. Physiographic data derived from USGS and modified by the Chesapeake Bay Program GIS Team to divide the Piedmont into three distinct regions. Two out of the eight major US physiographic regions fall within the Chesapeake Bay Watershed; the Atlantic Plains and Appalachian Highlands. Within these regions, there are eight provinces within the Bay Watershed; the Appalachian Plateau, Appalachian Mountain, Blue Ridge, Great Valley, Mezosoic Lowland, Piedmont Upland, Piedmont Lowland, and Coastal Plains. Physiographic provinces are categorized by rock type, terrain texture, as well as geologic structure and history.

The 11 digit Hydrologic Unit Code (HUC) coverage for the Chesapeake Bay watershed states level is an aggregate of the individual states clipped to the Chesapeake Bay Basin boundaries. These states are Delaware, Maryland, New York, Pennsylvania, Virginia, West Virginia, and Washington, D.C. This aggregate HUC-11 data set has been modified by the Chesapeake Bay Program GIS Team from USGS data to ensure edge matching and closed watersheds along state boundaries. There are a total of 506 HUC-11/watersheds for the Chesapeake Bay Basin in this aggregate data set.

8-digit Hydrologic Unit Code (HUC) for the Chesapeake Bay watershed states level was created by dissolving huc11_hr02.The aggregate HUC-11 data set has been modified from USGS data by the Chesapeake Bay Program GIS Team to ensure edge matching and closed watersheds along state boundaries. There are a total of 506 HUC-11/watersheds for the Chesapeake Bay Basin in this aggregate data set.

This map separates small watersheds of the Chesapeake Bay basin into eight classes based on the percentages of forest, agriculture and developed land covers from year 2000 satellite data within those watersheds. A similar map was published in the State of the Chesapeake Forests report.