Drought Vulnerability of Illinois' Community Surface Water Systems, Illinois State Water Survey

Illinois Drought


System Information

System Description

Water is pumped directly to the treatment plant from two impounding reservoirs, Lake Bloomington and Evergreen Lake. An intake on the Mackinaw River can pump up to 14,000 gpm into Evergreen Lake during droughts if required instream flows in the river are maintained.

Satellite Communities and Water Districts

Bloomington Township - West Phase, Crestwicke, Hudson, and Towanda
Locator map for Bloomington

Population Served:





Water Source
Name Type Stream DA (sq mi) SA (ac) Capacity Year Est. Est. 2010 Cap. (ac-ft)
Lake Bloomington IR Money Cr 69 540 6800 1999 6482
Evergreen Lake IR Six Mile Cr 900 15610 1999 15369
Mackinaw River RW Mackinaw R 400

1989 Study:

20-year drought yield insufficient at 2000 level of water use.

USGS Gages:

Money Cr - Towanda (05564400), Hudson (05564500), Mackinaw R near Congerville (05567500)

Developments since 1989:

The Evergreen Lake spillway was raised 5 feet in 1995. The Mackinaw River was used in 2000 and 2006. New groundwater sources are being evaluated, including a ~20 mgd regional supply in western McLean County and another in the Danvers bedrock valley of the Mahomet aquifer that could provide 2-3 mgd for blending when nitrate levels in Lake Bloomington are high.
Chart of Annual Raw Water Production (mgd)

Notes and Terminology

Vulnerability Report

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Illinois State Water Survey

2204 Griffith Dr., MC-674
Champaign, IL 61820-7463
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