Data Desk Minnesota Pollution Control Agency (MPCA) 520 Lafayette Rd N St. Paul MN 55155 datadesk.mpca@state.mn.us 20200114 TSS Regions 2020-01-14 Minnesota Pollution Control Agency Minnesota Pollution Control Agency These data show the total suspended solids (TSS) regions in the State of Minnesota. Water quality standards for TSS are applied to stream assessment units based on their relationship to these regions, thought the nature of that relationship may not be as direct as a spatial intersect. Users should NOT rely solely on this dataset to determine the standard applicable to a specific waterbody. The standards, as applied, may incorporate a downstream distance decay allowance. Thus, a stream flowing from the north to the central region may retain the north region's standard as water moves into the central region for a distance determined by MPCA surface water scientists. In addition, there area several places in the state with reach specific criteria.The regions are aggregations of the USDA Natural Resources Conservation Services 12 digit hydrologic unit code (HUC 12) polygons. For a detailed view of the standards applicable to a specific reach, please see the related dataset: river_tss_standards_wids These data are intended to be used for planning, informational, and cartographic purposes related to surface water quality in Minnesota. Data Desk Minnesota Pollution Control Agency (MPCA) 520 Lafayette Rd N St. Paul MN 55155 datadesk.mpca@state.mn.us Minnesota inlandWaters, surface water, water chemistry, water quality, suspended solids ISO 19115 Minnesota inlandWaters, surface water, water chemistry, water quality, suspended solids NOTICE: The Geographic Information System (GIS) Data to which this notice is attached are made available pursuant to the Minnesota Government Data Practices Act (Minnesota Statutes Chapter 13). THE GIS DATA ARE PROVIDED TO YOU AS IS AND WITHOUT ANY WARRANTY AS TO THEIR PERFORMANCE, MERCHANTABILITY, OR FITNESS FOR ANY PARTICULAR PURPOSE. The GIS Data were developed by the Minnesota Pollution Control Agnecy for its own internal business purposes. The Minnesota Pollution Control Agency does not represent or warrant that the GIS Data or the data documentation are error-free, complete, current, or accurate. You are responsible for any consequences resulting from your use of the GIS Data or your reliance on the GIS Data. You should consult the data documentation for this particular GIS Data to determine the limitations of the GIS Data and the precision with which the GIS Data may depict distance, direction, location, or other geographic features. If you transmit or provide the GIS Data (or any portion of it) to another user, the GIS Data must include a copy of this disclaimer. river_tss_standards_wids true -97.23 -89.53 49.37 43.5 2025-02-04 Minnesota These data have been reviewed for accuracy by the MPCA staff responsible for developing the river TSS standards. These data contain a feature for every TSS region for the state. Statements of horizontal positional accuracy are based on accuracy statements made for U.S. Geological Survey topographic quadrangle maps. These maps were compiled to meet National Map Accuracy Standards. For horizontal accuracy, this standard is met if at least 90 percent of points tested are within 0.02 inch (at map scale) of the true position. Additional offsets to positions may have been introduced where feature density is high to improve the legibility of map symbols. In addition, the digitizing of maps is estimated to contain a horizontal positional error of less than or equal to 0.003 inch standard error (at map scale) in the two component directions relative to the source maps. Visual comparison between the map graphic (including digital scans of the graphic) and plots or digital displays of points, lines, and areas, is used as control to assess the positional accuracy of digital data. Digital map elements along the adjoining edges of data sets are aligned if they are within a 0.02 inch tolerance (at map scale). Features with like dimensionality (for example, features that all are delineated with lines), with or without like characteristics, that are within the tolerance are aligned by moving the features equally to a common point. Features outside the tolerance are not moved; instead, a feature of type connector is added to join the features. This statement is generally true for the most common sources of NHD data. Other sources and methods may have been used to create or update NHD data. In some cases, additional information may be available from the data provider upon request. The regions are aggregations of the USDA Natural Resources Conservation Services 12 digit hydrologic unit code (HUC 12) polygons, which are available here: https://gdg.sc.egov.usda.gov/ http://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm river_tss_regions MPCA OBJECTID GIS Feature ID Esri Shape Geometry object Esri TSS_Region Name of the TSS Region MPCA Shape_Length Perimeter of polygon - defined by feature geometry Esri Shape_Area Area of polygon - defined by feature geometry Esri new_attribute REGION: The regions are aggregations of the USDA Natural Resources Conservation Services 12 digit hydrologic unit code (HUC 12) polygons. 1.0 20260311 05370900 TRUE