Statewide Altered Watercourse Project

The Altered Watercourse Project was a joint effort between the Minnesota Pollution Control Agency (MPCA) and Minnesota Geospatial Information Office (MnGeo) to create a statewide inventory of streams that have been hydrologically altered (e.g. channelized, ditched or impounded). The dataset was created to support MPCA's water quality monitoring and assessment program and provides information about stream habitats that have been compromised through such alteration.<br/><br/>The project entailed digitization of Geographic Information System (GIS) 'events' on to the United States Geological Survey's National Hydrography Dataset (NHD) stream linework. The events were then categorized as one of four types: Altered, Natural, Impounded, or No definable channel, based upon a standardized methodology and criteria. These categorizations were performed manually by GIS technicians using visible interpretation of multiple years of aerial photography, LiDAR (Light Detection And Ranging)-based elevation data, and various other reference data in ArcGIS 10.0.<br/>

Additional Info

Field Value
Last Updated December 8, 2016, 11:02
Created June 25, 2014, 21:29
dsAccessConst None
dsCurrentRef Altered Watercourse data is updated annually to reflect changes identified during the Intensive Watershed Monitoring process supporting the surface water assessments. Select HUC8's are reviewed during the assessment, and changes will be based in those HUC8's for a given assessment year.
dsMetadataUrl ftp://ftp.gisdata.mn.gov/pub/gdrs/data/pub/us_mn_state_pca/water_altered_watercourse/metadata/metadata.html
dsModifiedDate 2016-12-07 23:46:59
dsOriginator Minnesota Geospatial Information Office (MnGeo) for the Minnesota Pollution Control Agency
dsPurpose This project is being conducted in support of the MPCA's water quality monitoring and assessment program. Specifically, the MPCA is developing a refined use designation process known as 'Tiered Aquatic Life Use' (TALU) to account for situations in which stream habitat has been compromised through hydrological alteration. An accurate state-wide determination of altered streams will assist in the assignment of the correct beneficial use within this new TALU framework.

Dataset extent

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