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Data Online
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  Flint-Henderson Watershed Profile
Environmental Protection Agency website containing numerous links to environmental data about the Flint-Henderson watershed.
3  Flint-Henderson Watershed Resource Links
USGS maintained site with links to data, projects, and publications on HUC watersheds.
4  Flint-Henderson 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  Henderson 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.
7  Illinois Water Quality
EPA maintained website with links to all Illinois watershed water quality summary reports dating back to 1996.
8  La Moine Watershed Profile
Environmental Protection Agency website containing numerous links to environmental data about the La Moine Watershed.
9  La Moine Watershed Resource Links
USGS maintained site with links to data, projects, and publications on HUC watersheds
10  La Moine 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.
11  Lower Illinois River Basin Aerial Photographs
Photo mosaics, close-ups, and oblique angle photos of river features.
12  Lower Illinois River Basin: Sediment and Discharge
Graphic depicting sediment and discharge levels throughout the Lower Illinois River channel.
13  Monthly Climate Data- Gladsto, IL
Monthly precipitation and temperature data provided by the State Climatologist. Data available from 1939-present.
14  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.
15  NAWQA Data Warehouse
Searchable database of National Water Quality Assessment data.
Maps/GIS
16  1993 Mississippi River Flood Hazard Mitigation Grant Program
1993 Mississippi River flood maps that show properties damaged in the event.
17  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
18  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
19  Elevation in the Illinois River Watershed
Thematic map showing elevation changes in the basin.
Download Options: LoRes preview | HiRes (1.76 MB) | Metadata
20  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

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