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1  7-Day 10-Year Low Flow Maps

These maps provide information on low flow conditions that might be expected to occur only during droughts (once in 10 years), and associated effluent discharges, water withdrawals, and flow regulations for most Illinois rivers and streams.

2  Big Muddy Watershed Profile

Environmental Protection Agency website containing numerous links to environmental data about the Big Muddy watershed.

3  Big Muddy Watershed Resource Links

USGS maintained site with links to data, projects, and publications on HUC watersheds.

4  Big Muddy Watershed Water Data

The USGS National Water Information System provides real-time and historical data on surface water flow, ground water levels, and water quality of streams in the US.

5  Flood Discharge Database

FEMA-published and selected other statistical flood discharge values, searchable by watershed or county.

6  Illinois Water Quality

EPA maintained website with links to all Illinois watershed water quality summary reports dating back to 1996.

7  Monthly Climate Data- Marion, IL

Monthly precipitation and temperature data provided by the State Climatologist. Data available from 1942-present.

8  National Weather Service: River Watch, Mississippi River Basin

Illinois River 5-day stage forecasts for three main river segments: Morris to LaSalle, Henry to Beardstown, and New LaGrange to Hardin. Includes links to Upper Mississippi Basin stage forecasts.

9  SOUTH FORK SALINE RIVER AT NEW DENNISON, IL - Water Data

The USGS National Water Information System provides real-time and historical data on surface water flow, ground water levels, and water quality of streams in the US.

10  South Fork Saline River near Crab Orchard, IL - Water Data

The USGS National Water Information System provides real-time and historical data on surface water flow, ground water levels, and water quality of streams in the US.

11  Williamson County Water Data

The USGS National Water Information System provides real-time and historical data on surface water flow, ground water levels, and water quality of streams in the US.

12  Illinois County Boundaries, Polygons and Lines

GIS data - zipped shapefile  

13  Illinois Floodplain Maps

ISWS resource providing preliminary and final maps of Illinois floodplains.

14  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

15  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

16  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.

17  Williamson County Coal Maps

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

18  Williamson County Orthophotography Data 1998-1999

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

= Abstract available     = Full Text available     = Fact Sheet available
= PDF format     = HTML format     = PowerPoint format

19  100 - year rainstorms in the Midwest: design characteristics

Huff, Floyd A., 1993 ISWS C-176

20  7-day 10-year low flows of streams in the Kankakee, Sangamon, Embarras, Little Wabash, and southern regions

Singh, Krishan P., Ganapathi S. Ramamurthy, and Il Won Seo, 1988 ISWS CR-441

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