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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 RIVER AT HAVANA, 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 RIVER AT POWER COMPANY AT HAVANA, 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.
5  Illinois Water Quality
EPA maintained website with links to all Illinois watershed water quality summary reports dating back to 1996.
6  Imperial Valley and Cook County Precipitation Network Data
data from rain gauge arrays operated by the Illinois State Water Survey
7  Lower Illinois River Basin Aerial Photographs
Photo mosaics, close-ups, and oblique angle photos of river features.
8  Lower Illinois River Basin: Sediment and Discharge
Graphic depicting sediment and discharge levels throughout the Lower Illinois River channel.
9  Lower Illinois- Lake Chautauqua Watershed Profile
Environmental Protection Agency website containing numerous links to environmental data about the Lower Illinois-Lake Chautauqua watershed.
10  Lower Illinois- Lake Chautauqua Watershed Resource Links
USGS maintained site with links to data, projects, and publications on HUC watersheds
11  Lower Illinois- Lake Chautauqua 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.
12  Lower Sangamon Watershed Profile
Environmental Protection Agency website containing numerous links to environmental data about the Lower Sangamon watershed.
13  Lower Sangamon Watershed Resource Links
USGS maintained site with links to data, projects, and publications on HUC watersheds
14  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.
15  Mackinaw River Stage Data and Forecasts
Data provided by the National Weather Service’s Advanced Hydrologic Prediction Service
16  Mackinaw Watershed Profile
Environmental Protection Agency website containing numerous links to environmental data about the Mackinaw watershed.
17  Mackinaw Watershed Resource Links
USGS maintained site with links to data, projects, and publications on HUC watersheds
18  Mackinaw 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.
19  Mason 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.
20  Monthly Climate Data- Havana, IL
Monthly precipitation and temperature data provided by the State Climatologist. Data available from 1948-present.

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