Iowa's 2014 Listing of Clean Water Act Section 303(d) and 305(b) Impaired Streams

Iowa Department of Natural Resources 20150921 Iowa's 2014 Listing of Clean Water Act Section 303(d) and 305(b) Impaired Streams 20150806 Vector Digital Data Set (Polyline) http://www.igsb.uiowa.edu/nrgislibx/ This dataset contains line work that representing streams and rivers listed as "impaired" in Iowa's 2014 Section 305(b) Water Quality Assessment and the 303(d) Impaired Waters Report. Together, these two reports are known as Iowa's 2014 Integrated Report. Waterbodies in Iowa each have specific designations based on what they are commonly used for-recreation, such as swimming or fishing; drinking water; or maintaining a healthy population of fish and other aquatic life. Every two years, Iowa must report on its progress in meeting water quality goals to the U.S. Environmental Protection Agency (EPA). The state prepares one report called the 305(b) Water Quality Assessment or 305(b) list. This 305(b) list categorizes waterbodies to reflect: those that meet all the designated uses (category 1), those in which data availability is insufficient to determine whether any or all designated uses are being met (categories 2 and 3), and those waters in which the water quality prevents it from fully meeting its designated use, and is thus considered "impaired". New impairments (or category 5 listings) are placed on the "303(d) Impaired Waters Report", commonly referred to as the "impaired waters list." This is named after section 303(d) of the Federal Clean Water Act and means that the stream or lake needs a water quality improvement plan written (also known by a technical name, "Total Maximum Daily Load," or "TMDL"). The water quality improvement plan outlines water quality problems, identifies sources of the problem(s), identifies needed reductions in pollutants and offers possible solutions. Water quality improvement plans are approved by the EPA and then the waters are moved from the 303(d) list back to the 305(b) list as category 4 listings (waters considered impaired, but a water quality improvement plan has been written). This digital, geographically referenced data set was developed by the Iowa Department of Natural Resources to carry out agency responsibilities related to management, protection, and development of Iowa's natural resources. Category 5 waterbodies can be defined as those impaired by a pollutant and in need of a TMDL. 2014 ground condition Complete Biennial -96.684885527 -90.081837654 43.556694397 40.335145305 ISO 19115 TopicCategory inlandWaters Iowa DNR Water Monitoring Section keywords ADBNet Water Quality Section 303(d) Section 305(b) Iowa Impaired Waters List Clean Water Act Water Quality Assessment Iowa DNR GNIS Iowa None The development of the coverages in the NRGIS Library represents a major investment of staff time and effort. As a professional responsibility, the Iowa DNR expects to receive proper credit when these GIS coverages are utilized. The Department also expects that the original documentation will remain with any redistribution of these coverages. John Olson Iowa Department of Natural Resources mailing and physical address

502 E. 9th St.

Des Moines Iowa 50319 USA (515) 725-8385 John.Olson@dnr.iowa.gov ADBNet technical contact: Jamie Mootz, Iowa Department of Natural Resources, (515) 725-8382, Jamie.Mootz@dnr.iowa.gov GIS technical contact: Andy Asell, Iowa Department of Natural Resources (515) 725-8386, Andy.Asell@dnr.iowa.gov State of Iowa Enterprise Data Classification Standard Public Esri ArcGIS 10.2 (Build 3348) Service Pack N/A (Build N/A) No formal attribute accuracy tests were conducted. None This is the version of impaired streams for 2014. All streams that were assessed and found to be impaired are included. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. A formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable. NHD Flowline withheld Digital and/or Hardcopy Resources Source Input 1 Source information used in support of the development of the data set. The listing process: Development of the 303(d) list includes the following basic steps: -Assemble all existing and readily available water quality-related data and information to develop the Section 305(b) report; -Identify water quality-related data and information of sufficient quality and quantity for purposes of water quality assessment; -Compare these water quality-related data and information to state water quality standards to determine the degree to which assessed waters meet these standards; -Generate the Section 305(b) and Section 303(d) reports and summarize waterbody assessment information in a MicroSoft Excel spreadsheet. Unknown GIS Compilation: -Final 303(b)/305(b) Excel Spreadsheet from previous steps joined to internal SDE layer based on field "SegID" and exported to new polygon shapefile. -Any null data values populated utilizing information found within "ADBNet - 305(b) Water Quality Assessment Database" https://programs.iowadnr.gov/adbnet/index.aspx Vector Simple FALSE 0 TRUE FALSE coordinate pair 0.6096 0.6096 Meter D_North_American_1983 GRS_1980 6378137.0 298.257222101 Attribute Table Table containing attribute information associated with the data set. Producer defined Feature Class 0 OBJECTID_1 OBJECTID_1 OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. ObjectID Unknown Producer defined 1 739 ObjectID Double 8 38 8 WBID ADBNet Waterbody Code. Unique Text Waterbody ID. Producer defined Unknown WBID String 50 0 0 Waterbody Name of waterbody. Producer defined Unknown Waterbody String 254 0 0 List Denotes whether the waterbody is categorized as a member of the Section 305(b) (category 4 impairments) or 303(d) list (category 5 impairments). Producer defined 303(d) Unknown Producer defined 305(b) Unknown Producer defined List String 10 0 0 IRCategory 2014 IR (Integrated Report) Category; Integrated Report Category descriptions are listed at https://programs.iowadnr.gov/adbnet/help/ircategories.aspx Producer defined 4a Unknown Producer defined 4c Unknown Producer defined 4d Unknown Producer defined 5a Unknown Producer defined 5b Unknown Producer defined 5b-t Unknown Producer defined 5b-v Unknown Producer defined 5p Unknown Producer defined IRCategory String 8 0 0 Imp_Use designated use category for which the waterbody is impaired. Producer defined Aquatic Life Unknown Producer defined Drinking Water Unknown Producer defined Fish Consumption Unknown Producer defined General Use Unknown Producer defined Primary Contact Unknown Producer defined Secondary Contact Unknown Producer defined Imp_Use String 254 0 0 CauseStres The cause or stressor responsible for the waterbody's impairment Producer defined Unknown CauseStres String 254 0 0 UseSupport Extent to which the waterbody supports the designated use Producer defined Not Assessed Unknown Producer defined Not Supporting Unknown Producer defined Partially Supporting Unknown Producer defined Threatened Unknown Producer defined UseSupport String 254 0 0 Yr_Imp Year in which the waterbody was initially reported as "impaired" Producer defined 1998 2014 Yr_Imp Integer 4 10 0 Location Detailed location, including legal description, of impaired feature. Producer defined Unknown Location String 254 0 0 Rationale Explanation as to why the waterbody has been categorized as impaired Producer defined Unknown Rationale String 254 0 0 NoImp4WB Total number of impairments listed for the individual waterbody Producer defined 1 4 NoImp4WB Integer 4 10 0 Shape_Leng Unknown Producer defined 342.232972729 71417.2220946 Shape_Leng Double 8 38 8 Shape Shape Geometry 4 0 0 Feature geometry. Esri Coordinates defining the features. Shape.len Shape.len Double 0 0 0 Details on IRCat2014 and IRCat2008 data columns: Definition of Categories 4 and 5 of Iowa's 2014 Integrated Report: Category 4a: at least one use is impaired, but a TMDL has been completed and approved Category 4b: at least one use is impaired, but other required control measures are expected to result in attainment of WQ Standards Category 4c: at least one use impaired, but the impairment is not caused by a "pollutant." Category 4d: water is impaired by a fish kill but enforcement actions have been taken against responsible party Category 5a: cause of impairment due to known pollutant Category 5b: biological impairment with cause unknown, or fish-kill impairment Category 5p: impairment of presumptive use; EPA-approved use attainability analysis (UAA) needed to determine appropriate use. Details on Legend column: Used for spatial representation of impaired waters on a map: 1 = Impaired and TMDL needed (303(d) list) (Category 5) 2 = Impaired; TMDL completed and approved (Category 4a) 3 = Other Impairments; TMDL not needed (Category 4c, 4d) The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information. Iowa Geological Survey, DNR GIS Librarian mailing and physical address

109 Trowbridge Hall

Iowa City IA 52242 319-335-1575 gis_library@igsb.uiowa.edu Downloadable Data Although efforts have been made in correcting errors in order to make this information useful to the Department, the Department assumes no responsibility for errors in the information. Similarly, the Department assumes no responsibility for the consequences of inappropriate uses or interpretations of the data made by anyone to whom this data has been made available. The Department bears no responsibility to inform users of any changes made to this data. Anyone using this data is advised that precision implied by the coverage may far exceed actual precision. Comments on this data are invited and the Department would appreciate that documented errors be brought to staff attention. Vector Digital Data Set (Polyline) zip 13.512 http://www.igsb.uiowa.edu/nrgislibx/ Anonymous FTP. Click on link provided. None Use anonymous ftp address given. Immediate 365 days/year 24 hours/day 20151027 Iowa Geological Survey, DNR GIS Librarian Mailing and Physical

109 Trowbridge Hall

Iowa City IA 52242-1319 319-335-1575 gis_library@igsb.uiowa.edu FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time None None http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile Version 6.2 (Build 9200) ; Esri ArcGIS 10.1.0.3035 Impaired_Streams_2014 Impaired_Streams_2014 002 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) NAD_1983_UTM_Zone_15N <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.1'><WKT>PROJCS["NAD_1983_UTM_Zone_15N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-93.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26915]]</WKT><XOrigin>-5120900</XOrigin><YOrigin>-9998100</YOrigin><XYScale>10000</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>26915</WKID><LatestWKID>26915</LatestWKID></ProjectedCoordinateSystem> 20151109 15444100 20151109 15444100 Feature Class dataset EPSG 7.9.4 0 20151109