Short description:
Impaired Streams TMDL (IDEM, 2018) - Shows impaired streams in Indiana from 2018 that have Total Maximum Daily Load (TMDL) reports approved by the U.S. EPA. Attributes include regulatory identification numbers (IDEM), Hydrologic Unit Code (HUC) IDs, stream segment names, and TMDL Document identification numbers arranged by impairment type (Bacteria/E. coli, Ammonia, Dissolved Oxygen, Impaired Biotic Communities, Nutrients, pH, and Siltation). Provided by personnel of the Indiana Department of Environmental Management (IDEM), Office of Water Quality on May 28, 2020. The following is excerpted from IDEM, OWQ documentation:
"The Indiana Total Maximum Daily Load (TMDL)-approved Impaired Waters layer reported in 2018 as part of the Indiana Integrated Water Monitoring and Assessment Report, includes the rivers, streams, and tributaries that, once the TMDL is implememnted in each waterbody, will meet water quality standards for 1 or more monitored indicators. At this point the listed assessment use will also be updated to supporting one or more uses not previously supporting that use."
"This layer is a subset of the statewide high-resolution National Hydrography Dataset (NHD) of streams that have been updated with Assessment Unit Identifiers (AUIDs) to correspond to the assessments based on waterbody characteristics, water chemistry, and biological parameters, e.i., habitat conditions, the health and diversity of fish and macroinvertebrate communties, plus fish tissue evaluations. The NHD has been further edited using the HEM tool for segment records to coinside with impairment extent."

IndianaMap, IGWS, Indiana, sediment inventory, water quality statistics, water quality observation, impaired stream, impaired lake, water, TMDL, Total Daily Maximum Load, 303d list, 305b list, pollution, environment, health, inlandWaters

Indiana Department of Environmental Mangement, U.S. Environmental Protection Agency
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