National Hydrography

Stewardship and Community

The National Hydrography Dataset (NHD), Watershed Boundary Dataset (WBD), and NHDPlus High Resolution (NHDPlus HR) are updated and maintained through a strong community of Stewards and users.

Hydrographic Data Community

Hydrographic Data Community

The Markup Reviewer, used by the USGS and the NHD state stewards to review suggested edits, is available for download at the USGS Hydrographic Data Community (HDC).

Explore HDC

Water Resources Community of Use

Water Resources Community of Use

The Water Resources Community of Use assists the National Geospatial Program in developing better, user-friendly data and tools for USGS hydrologists and Federal, State, and local water resource managers across the Nation.

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Just as building the NHD and WBD required a large partnerships across the nation, maintaining the NHD and WBD also requires an extensive partnership, and can best be accomplished by those closest to the hydrography. Users within the states and Federal lands understand the hydrography around them and are motivated to ensure the accuracy of the NHD to meet their business needs. They are uniquely suited to become the stewards of the data. The USGS facilitates the overall Stewardship process, providing national management, coordination, tools, standards, documentation, training, quality assurance, data archival, and data distribution, and Stewards provide local hydrographic knowledge through data editing and updates. Edits and updates to the NHD are made by Stewards and processed and made available in the national dataset distribution by the USGS.

NHD/ WBD Stewardship Support Regions

NHD/WBD Stewardship Support State Coverage Map, broken down by region:

  • Western Region indicated in blue - Bill Smith
  • South Central Region indicated in peach - Joel Skalet
  • North Central Region indicated in green - Joel Skalet
  • Southeast Region indicated in pink - Joel Skalet
  • Northeast Region indicated in yellow - Tatyana Dimascio
  • Bold line boundaries indicate 2-Digit Hydrologic Units

Nationalwide Support: 

  • WBD Support - Lily Niknami
  • HEM Support - Mike Tinker
  • Conflation Support - David Anderson

(Public domain.)


Ray Postolovski

Supervisory Cartographer
National Geospatial Technical Operations Center (NGTOC)
Phone: 303-202-4363

Michael Tinker

National Geospatial Technical Operations Center (NGTOC)
Phone: 303-202-4476

Joel J Skalet

National Geospatial Technical Operations Center (NGTOC)
Phone: 608-238-9333

Tatyana Dimascio

National Geospatial Technical Operations Center (NGTOC)
Phone: 303-202-4206

National Hydrography Support

Support for NHD, WBD, & NHDPlus HR
National Geospatial Program (NGP)