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Layer: ADvanced IDentification Wetlands (0)

Name: ADvanced IDentification Wetlands

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Description: Boundaries of designated high quality ADID wetlands established as a result of a formal process under the direction of the U.S. Environmental Protection Agency. Part 404(b)(1) of the Clean Water Act authorizes the USEPA and the US Army Corps of Engineers to identify in advance of specific permit requests aquatic sites which will be considered as areas generally unsuitable for disposal of dredged or fill material. This process is called an Advanced Identification or ADID. Under the ADID process identification of an area as generally unsuitable for fill does not prohibit applications for permits to fill in these areas. Therefore the ADID designation of unsuitability is advisory not regulatory. An ADID designation lets a potential applicant know in advance that a proposal to fill such a site is not likely to be consistent with the 404(b)(1) guidelines, and the USEPA will probably request permit denial. ADID wetland information is also useful in watershed planning, land use planning, public land acquisition programs, natural resource studies and other purposes. The wetland selection criteria and methodology are documented in the publication entitled "Advanced Identification (ADID) Study, Lake County, Illinois. Final Report, November 1992" which is included in this download. Boundaries were delineated by the ADID project team on orthophotograph background with an intended usage scale of 1" = 400', a scale ratio of 1:4800.

Copyright Text: Lake County, Illinois

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Layer: ADID with 100ft Buffer (1)

Name: ADID with 100ft Buffer

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Description:

Copyright Text:

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Spatial Reference: 102100  (3857)



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Layer: Lake County Wetland Inventory (2)

Name: Lake County Wetland Inventory

Display Field: TYPE

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Description: The Lake County Wetland Inventory (LCWI) maps natural and artificial wetlands meeting definitions established by the federal agencies who work with the Lake County Geographic Information System staff to periodically review and update it. These agencies include the United States Environmental Protection Agency, the U.S. Fish and Wildlife Service, the USDA Natural Resources Conservation Service and the United States Army Corps of Engineers. The 1989 federal wetland delineation standards for offsite wetland mapping are used. This data was last published in March of 1993. This update includes changes to the previous version of LCWI including: adjust current wetland boundaries to omit development, including roads; to fine tune boundary placement where that was intended by the original delineation, in some cases, adjust the wetland to photographic features / signature; delete wetlands which the committee decided were mapped in error - for example, trees which were mistaken for wet areas; create polygons for newly delineated artificial wetlands; and newly delineated wetlands or farmed wetlands caused by the continued deterioration of the agricultural drain tile system and increased runoff due to urbanization. The LCWI is a useful tool for general planning and review purposes, but it does not take the place of an on-site delineation by a certified wetland specialist. High resolution (1" = 100') orthorectified aerial imagery captured in April 2002 was used as the base for this update. Other data used as reference for this update include: 2004 SOIL SURVEY GEOGRAPHIC (SSURGO) DATABASE FOR LAKE COUNTY, IL - U.S. Department of Agriculture, Natural Resources Conservation Service; HYDROLOGY2002 - Lake County GIS/Map Division; 2' topography (CONTOURS) - Lake County GIS/Map Division; and various years of historical aerial photography for clarification. By using the more recent higher resolution photography, the resulting updated wetland boundaries are more accurate then the original boundaries published in 1993.

Copyright Text: Lake County, Illinois

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Spatial Reference: 102100  (3857)



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Layer: 2002 Hydro Lines (4)

Name: 2002 Hydro Lines

Display Field: GISID

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Description: This dataset represents the linear water features (for example, dams, culverts, and streams) and the outer boundary of the water feature areas (for example, lakes and ponds) of Lake County, Illinois. The features in the dataset include: dams, culverts, local drainage; and the outer boundary of lakes, ponds, detention/retention basins, river/streams/creeks greater than five feet wide, and islands. The data has not been field verified and errors and/or omissions may be present. The names used for the water bodies were collected from a number of sources including: existing datasets, historic maps and/or atlases, US Geologic Survey (USGS) Geographic Names Information System (GNIS), current and historical USGS topographic quadrangle maps, local publications on place names within the county, and platted subdivisions. The dataset was traced from aerial photography captured between April 13 and April 26, 2002. The water features were compiled using softcopy analytical stereoplotters. This dataset should meet National Map Accuracy Standards for a 1:1200 product and it is georeferenced to the Illinois State Plane, Eastern Zone, using the NAD83 HARN horizontal datum.

Copyright Text: Lake County, Illinois

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Layer: 2022 Hydro Areas (6)

Name: 2022 Hydro Areas

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Description: This dataset represents major water features in Lake County, Illinois.

Copyright Text: Lake County, Illinois

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Layer: Lake Michigan (8)

Name: Lake Michigan

Display Field: NAME

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Description:

Copyright Text: Lake County, Illinois

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