Description: Sampling stations have been located using map interpolation and GPS. Points have been checked for accuracy against 1999 & 2005 DOQQ datasets. Stations are located based on sampling need and staff accessiblity.
Service Item Id: 07be7023efdc4f658e4efe50d7364ebd
Copyright Text: Illinois EPA, Bureau of Water, Surface Water Section
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Description: Illinois streams based primarily on the National Hydrography Dataset (NHD) which have been assigned an assessment unit ID (AUID) by the Illinois EPA. The coverage provides the geographical basis upon which stream segments are delineated and to which Illinois EPA's use attainment assessments apply. While most of the coverage is based on the NHD it also contains a few stream segments not currently part of the NHD. Line segments through some but not all lakes for which use attainment assessments apply are also identified.
Service Item Id: 07be7023efdc4f658e4efe50d7364ebd
Copyright Text: Base line work - National Hydrography Dataset
Segment Deliniation - Illinois EPA, Bureau of Water, Surface Water Section
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