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

Illinois Drought


System Information

System Description

The community directly receives water from Palmyra-Modesto Lake at up to 200 gpm. Terry Park Lake, located immediately upstream, serves as a sedimentation basin. There is an emergency connection with Otter Lake, but it is difficult to activate the connection's check valve.

Satellite Communities and Water Districts

Hettick*, Scottville Rural Water, and South Palmyra*
Locator map for Palmyra-Modesto

Population Served:





Water Source
Name Type Stream DA (sq mi) SA (ac) Capacity Year Est. Est. 2010 Cap. (ac-ft)
Palmyra-Modesto Lk IR Nassa Cr Trib 1.7 35 533.9 1965 470.6

1989 Study:

50-year drought yield insufficient at 1990 level of water use.

USGS Gages:

No data available

Developments since 1989:

Drought restrictions were considered in 2005 but never implemented. The dam was raised 14 inches during the 1980s. Terry Park Lake (2-3 ac), immediately upstream of the reservoir, was dredged in 1990. The 0.25 mgd treatment plant is around 40 years old. A 1 mgd hog operation closed in 1996, but S Palmyra and Hettick have recently began purchasing water from the system.
Chart of Annual Raw Water Production (mgd)
Note: *Hettick and the South Palmyra WD receive approximately half of their supply from Otter Lake.

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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