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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  Flood Discharge Database
FEMA-published and selected other statistical flood discharge values, searchable by watershed or county.
3  Illinois Water Quality
EPA maintained website with links to all Illinois watershed water quality summary reports dating back to 1996.
4  Logan 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.
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 Sangamon Watershed Profile
Environmental Protection Agency website containing numerous links to environmental data about the Lower Sangamon watershed.
8  Lower Sangamon Watershed Resource Links
USGS maintained site with links to data, projects, and publications on HUC watersheds
9  Lower Sangamon 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  Monthly Climate Data- Lincoln, IL
Monthly precipitation and temperature data provided by the State Climatologist. Data available from 1906-present.
11  Monthly Climate Data- Mount Pulaski, IL
Monthly precipitation and temperature data provided by the State Climatologist. Data available from 1901-present.
12  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.
13  NAWQA Data Warehouse
Searchable database of National Water Quality Assessment data.
14  Salt Watershed Profile
Environmental Protection Agency website containing numerous links to environmental data about the Salt watershed.
15  Salt Watershed Resource Links
USGS maintained site with links to data, projects, and publications on HUC watersheds
16  Salt 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.
17  Upper Sangamon Watershed Profile
Environmental Protection Agency website containing numerous links to environmental data about the Upper Sangamon watershed.
18  Upper Sangamon Watershed Resource Links
USGS maintained site with links to data, projects, and publications on HUC watersheds
19  Upper Sangamon 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.
Maps/GIS
20  Ammonia-N Concentrations in the Illinois River Watershed
Thematic map showing the mean total Ammonia-N for each of the major sub-watersheds.
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