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The County of DuPage
Wheaton, Illinois

Warrenville Grove Dam Modification  

The purpose of the Warrenville Grove Dam Modification project was to restore the ecological health of an impounded segment of the West Branch DuPage River extending the length of Warrenville Grove Forest Preserve. Using a grant from the National Oceanic and Atmospheric Administration, DuPage County modified the existing dam and restored upstream and downstream channel conditions, which: 

  • Restored the natural ecological functions and processes of a free- flowing river segment
  • Decreased lake-like conditions upstream of the dam that support high algal biomass, high water temperatures, and substandard dissolved oxygen levels, considered a non-pollutant impairment by Illinois Environmental Protection Agency (IEPA)
  • Decreased barriers to fish movement and mussel dispersion
  • Decreased liability exposure and maintenance of the dam
  • Provided improved educational and recreational opportunities for the community 

Pre-Construction Warrenville Grove Dam

Existing Warrenville Grove Dam

Post-Construction Warrenville Grove Dam

Warrenville Grove