USGS Streamgages Linked to the Medium Resolution NHD

Dates

Release Date: 2006-04-01
Publication Date: 2023-09-15

Citation

Stewart, D.W., Rea. A., and Wolock, D.M., 2006, USGS Streamgages Linked to the Medium Resolution NHD: U.S. Geological Survey data release, https://doi.org/10.5066/P9L2YHKX.

Summary

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. The locations of approximately 23,000 current and historical U.S. Geological Survey (USGS) streamgages in the United States and Puerto Rico (with the exception of Alaska) have been snapped to the medium resolution National Hydrography Dataset (NHD). The NHD contains geospatial information about mapped surface-water features, such as streams, lakes, and reservoirs, etc., creating a hydrologic network that can be used to determine what is upstream or [...]

Summary

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release.

The locations of approximately 23,000 current and historical U.S. Geological Survey (USGS) streamgages in the United States and Puerto Rico (with the exception of Alaska) have been snapped to the medium resolution National Hydrography Dataset (NHD). The NHD contains geospatial information about mapped surface-water features, such as streams, lakes, and reservoirs, etc., creating a hydrologic network that can be used to determine what is upstream or downstream from a point of interest on the NHD network. An automated snapping process made the initial determination of the NHD location of each streamgage. These initial NHD locations were comprehensively reviewed by local USGS personnel to ensure that streamgages were snapped to the correct NHD reaches. About 75 percent of the streamgages snapped to the appropriate NHD reach location initially and 25 percent required adjustment and relocation. This process resulted in approximately 23,000 gages being successfully snapped to the NHD. This dataset contains the latitude and longitude coordinates of the point on the NHD to which the streamgage is snapped and the location of the gage house for each streamgage. A process known as indexing may be used to create reference points (event tables) to the NHD reaches, expressed as a reach code and measure (distance along the reach). Indexing is dependent on the version of NHD to which the indexing is referenced. These data are well suited for use in indexing because nearly all the streamgage NHD locations have been reviewed and adjusted if necessary, to ensure they will index to the appropriate NHD reach. Flow characteristics were computed from the daily streamflow data recorded at each streamgage for the period of record. The flow characteristics associated with each streamgage include: First date (year, month, day) of streamflow data Last date (year, month, day) of streamflow data Number of days of streamflow data Number of days of non-zero streamflow data Minimum and maximum daily flow for the period of record (cubic feet per second) Percentiles (1, 5, 10, 20, 25, 50, 75, 80, 90, 95, 99) of daily flow for the period of record (cubic feet per second) Average and standard deviation of daily flow for the period of record (cubic feet per second) Mean annual base-flow index (BFI) computed for the period of record (fraction, ranging from 0 to 1) Year-to-year standard deviation of the annual base-flow index computed for the period of record (fraction) Number of years of data used to compute the base-flow index (years) The streamflow data used to compute flow characteristics were copied from the NWIS-Web historical daily discharge archive (http://waterdata.usgs.gov/nwis/sw) on June 15, 2005.

Contacts

Point of Contact :: U.S. Geological Survey, Integrated Modeling &Prediction Division
Originator :: David W. Stewart, Alan Rea and David M. Wolock
Metadata Contact :: U.S. Geological Survey
SDC Data Owner :: Integrated Modeling & Prediction Division
USGS Mission Area :: Water Resources

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streamgages.xml Original FGDC Metadata	View	43 KB	application/fgdc+xml
USGS_Streamgages-NHD_Locations_GEODB.zip		4.18 MB	application/zip
USGS_Streamgages-NHD_Locations_Cover.zip		4.56 MB	application/zip
USGS_Streamgages-NHD_Locations_Shape.zip		3.45 MB	application/zip

Purpose

The purpose of this dataset is to document the location of USGS active and historical streamgages on the NHD version 2002 medium resolution (1:100,000-scale). This dataset can also be used to index these USGS streamgages to other versions of the NHD as well. The flow characteristics tied to each of the streamgages attached to the NHD will greatly facilitate hydrologic analysis and can be used for such things as the development of regional statistical models of streamflow at ungaged locations.

USGS Streamgages Linked to the Medium Resolution NHD

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