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21  Ammonia-N Concentrations in the Illinois River Watershed

Thematic map showing the mean total Ammonia-N for each of the major sub-watersheds.

Download Options: LoRes preview | HiRes (624 K) | Metadata

22  Average soil depth in the Illinois River Watershed

Thematic map showing the average soil depth (inches) across the basin.

Download Options: LoRes preview | HiRes (3.36 MB) | Metadata

23  Des Plaines River Watershed Orthophotography 2000

Orthoimagery for the Des Plaines River Watershed from Year 2000 black-and-white aerial photography in the Illinois State Plane, East Zone with a NAD83 datum.  

24  Des Plaines Watershed

Thematic map of the Des Plaines watershed showing roads, county boundaries, and elevation changes.

Download Options: LoRes preview | HiRes (1.71 MB) | Metadata

25  Elevation in the Illinois River Watershed

Thematic map showing elevation changes in the basin.

Download Options: LoRes preview | HiRes (1.76 MB) | Metadata

26  Floodzones in the Illinois River Watershed

Thematic map showing the 100 and 500 year floodzones across the basin as of 1986.

Download Options: LoRes preview | HiRes (3.77 MB) | Metadata

27  Grundy County Coal Maps

ISGS Coal Map Series. Includes mines, resources, and logs.

28  Grundy County Orthophotography Data 1998-1999

Illinois National Aerial Photography Program Digital Orthophotography quarter Quadrangle data for Grundy County in the Universal Transverse Mercator (UTM) coordinate system with a NAD83 datum.  

29  Illinois Bluffs Watershed

Thematic map of the Illinois Bluffs watershed showing roads, county boundaries, and elevation changes.

Download Options: LoRes preview | HiRes (2.26 MB) | Metadata

30  Illinois County Boundaries, Polygons and Lines

GIS data - zipped shapefile  

31  Illinois Floodplain Maps

ISWS resource providing preliminary and final maps of Illinois floodplains.

32  Illinois River Basin GIS Data Viewer

Interactive map provided by the ISWS. Viewable layers include watersheds, rivers, water quality, geology, and groundwater.

33  Illinois River Basin Weather Stations

The weather stations in this data set were gathered from the WDM database within the Basins watershed modeling program. Coordinates for the stations were exported from Basins, then formatted and imported into ArcGIS. This data set was created to support research at the Illinois State Water Survey. (shapefile, .zip archive)   

34  Illinois River Watershed - Poster

Poster-sized (26x38) map of the entire Illinois River Watershed. Part of the Illinois State Water Survey published Map Series (2003-1)

Download Options: LoRes preview | HiRes (3.5 MB) | Metadata

35  Kankakee Watershed Map

Thematic map of the Kankakee watershed showing roads, county boundaries, and elevation changes.

Download Options: LoRes preview | HiRes (1.05 MB) | Metadata

36  Land cover in the Illinois River Watershed

Thematic map showing land cover from raster imagery.

Download Options: LoRes preview | HiRes (2.68 MB) | Metadata

37  Major Watersheds of Illinois

Poster-sized (26x38) map of the major watersheds in Illinois. Part of the Illinois State Water Survey published Map Series (2000-01)

Download Options: LoRes preview | HiRes (730 K) | Metadata

38  Nitrates in the Illinois River Watershed (mean total nitrate + nitrite-N concentrations)

Thematic map showing the mean total nitrate + nitrite-N concentrations for each of the major sub-watersheds.

Download Options: LoRes preview | HiRes (624 K) | Metadata

39  Phosphorus in the Illinois River Watershed

Thematic map showing the mean total phosphorus concentrations for each of the major sub-watersheds.

Download Options: LoRes preview | HiRes (624 K) | Metadata

40  Resource Management Mapping Service

Interactive map that allows users to locate, create, and print maps of large and small areas within Illinois. Natural resource, administrative, and economic layers available.

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