Water Information System

NHD High Resolution (1:24K) Data Download

In partnership with the USGS, the Montana State Library is the State Steward of the National Hydrography Dataset.

Information about the Downloadable Data

  • Statewide data are updated approximately every two months.
  • The main advantage of downloading from this page is data are provided in the Montana State Plane Coordinate System. However, if you are looking for the most recent NHD update use the USGS's National Map Viewer to download a "Dynamic Extract Product." A "Dynamic Extract" is a direct extract from the national database and includes the most recent edits submitted by state stewards and accepted by the USGS (~ 1 week refresh).
  • An FGDC metadata XML, readme, and NHD model diagram for the statewide Hydrography Dataset are provided with the download (metadata are also embedded in the geodatabase).
  • The data are in the Montana State Plane Coordinate System (NAD_1983_StatePlane_Montana_FIPS_2500_meters).
  • The NHD geodatabase contains a geometric network ("HYDRO_NET"), which allows the user to identify upstream and downstream paths using the Utility Network Analyst for ArcGIS.