w GIS  KMZ
  • This dataset is maintained and created by the Chesapeake Bay Program. The CBP collected these data in 2017 directly from state regulatory agencies, counties, and municipal organizations.
  • Municipal Separate Storm Sewer System (MS4) GIS  KMZ
    • This dataset is maintained and created by the Chesapeake Bay Program. The CBP collected these data in 2017 directly from state regulatory agencies, counties, and municipal organizations.
  • Fhed boundaries.  The segmentation is designed so that each land-river segment drains to only one of the 92 tidal water segments.
  • If you are working at a scale of Maryland 8-digit watershed, use these images and spreadsheet to map to a CAST modeling segment.
  • Hydrologic Unit Codes (HUCs)
    • HUCs spatial data are available for download through this USGS website.
  • Hydrogeomorphic Regions
    Chesapeake Bay Program Office Phase 6 - 8.5.1