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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  Flood Discharge Database

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

3  ILLINOIS RIVER AT VALLEY CITY, 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.

4  Illinois Water Quality

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

5  Lower Illinois River Basin Aerial Photographs

Photo mosaics, close-ups, and oblique angle photos of river features.

6  Lower Illinois River Basin: Sediment and Discharge

Graphic depicting sediment and discharge levels throughout the Lower Illinois River channel.

7  Lower Illinois Watershed Profile

Environmental Protection Agency website containing numerous links to environmental data about the Lower Illinois watershed.

8  Lower Illinois Watershed Resource Links

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

9  Lower Illinois 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.

10  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.

11  NAWQA Data Warehouse

Searchable database of National Water Quality Assessment data.

12  Scott 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.

13  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

14  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

15  Elevation in the Illinois River Watershed

Thematic map showing elevation changes in the basin.

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

16  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

17  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

18  Illinois County Boundaries, Polygons and Lines

GIS data - zipped shapefile  

19  Illinois Floodplain Maps

ISWS resource providing preliminary and final maps of Illinois floodplains.

20  Illinois River Basin GIS Data Viewer

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

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