Our program area, the Lower DuPage River watershed, covers 168 square miles and encompasses portions of 13 municipalities.  The majority of the watershed is within Will County, although portions of the watershed are included in DuPage, Grundy, and Kendall Counties.  There are 166 stream miles within the watershed.  By incorporating natural drainage divides, the watershed’s 12 subwatersheds are show in the map below.

 

Existing Land Use in the Watershed

Land Use Acres Percent in Watershed
Agricultural Land 28,786 26.72%
Commercial and Services 4,338 4.03%
Industrial, Warehouse, and Wholesale Trade 5,596 5.19%
Institutional 2,916 2.71%
Open Space 8,771 8.14%
Residential 34,951 32.44%
Transportation, Communication, and Utilities 2,848 2.64%
Vacant, Wetlands, or Under Construction 15,871 14.73%
Water 3,652 3.39%

 

2016 Stream Impairments and Specific Assessment Information – Illinois EPA assesses streams to determine whether they are meeting the designated uses, and to identify the causes and sources of the impairments.  The table below shows information about streams in the Lower DuPage River Watershed that Illinois EPA assesses.

2016 Integrated Report – Appendix B-2: Specific Assessment Information for Streams
Name AUID Designated Use   Causes   Sources
Du Page River IL_GB-01 Not Supporting: Aquatic Life, Fish Consumption Other flow regime alterations; Phosphorus (Total); Changes in stream depth and velocity patterns; Mercury; Polychlorinated biphenyls Dam or impoundment; Municipal point source discharges; Channelization; Source unknown
Fully Supporting: Aesthetic Quality
Du Page River IL_GB-11 Not Supporting: Aquatic Life, Fish Consumption, Primary Contact Alteration in stream-side or littoral vegetative covers; Arsenic; Chloride; Methoxychlor; Other flow regime alterations; Polychlorinated biphenyls; Sedimentation/Siltation; Phosphorus (Total); Aquatic plants (Macrophytes); Mercury; Fecal coliform Loss of riparian habitat; Contaminated sediments; Municipal point source discharges; Urban runoff/Storm sewers; Impacts from hydrostructure flow regulation/modification; Site clearance (land development or redevelopment); Upstream impoundments (e.g., Pl-566 NRCS structures); Dam or impoundment; Atmospheric deposition – toxics; Source unknown
Fully Supporting: Aesthetic Quality
Du Page River IL_GB-16 Not Supporting: Aquatic Life, Fish Consumption, Primary Contact Other flow regime alterations; Oxygen, Dissolved; Phosphorus (Total); Mercury; Polychlorinated biphenyls; Fecal coliform Impacts from hydrostructure flow regulation/modification; Municipal point source discharges; Site clearance (land development or redevelopment); Urban runoff/Storm sewers; Atmospheric deposition – toxics; Source unknown
Fully Supporting: Aesthetic Quality
Illinois & Michigan Canal IL_GBA Not Supporting: Fish Consumption Mercury Atmospheric deposition – toxics; Source unknown
Lily Cache Creek IL_GBE-01 N/A N/A
Fully Supporting: Aquatic Life, Aesthetic Quality
Lily Cache Creek IL_GBE-02 Not Supporting: Aquatic Life Cause Unknown N/A
Mink Creek  IL_GBEA N/A N/A
Rock Run IL_GBAA-01 Not Supporting: Aquatic Life Cause Unknown N/A
Spring Brook IL_GBKA Not Supporting: Aquatic Life, Primary Contact Alteration in stream-side or littoral vegetative covers; Chloride; Oxygen, Dissolved; Phsophorus (Total); Fecal coliform Channelization; Agriculture; Urban runoff/Storm sewers; Source unknown
Spring Brook IL_GBKA-01 Not Supporting: Aquatic Life, Primary Contact Alteration in stream-side or littoral vegetative covers; Phosphorus (Total); Loss of instream cover; Fecal coliform Channelization; Municipal point source discharges; Source unknown