Dataset

Winter Chloride Watch

Dataset by National Great Rivers

Dataset summary

Observations

  • 1 February 2026

    West Branch of the Dupage River at Weigand Riverfront Park by Erin Bellassai

  • 31 January 2026

    West Branch Dupage River by Heather Chartier

    River was frozen - did not sample

  • 31 January 2026

    River Grove at Grand Ave by Erika Street Hopman

    Ice on most of the river, small section flowing

  • 31 January 2026

    West Branch Dupage River by Gerry Gorman

    Ice covered 95%plus of the river in the area that I tested from

  • 31 January 2026

    Salt Creek Greenway Trail (just south of North Avenue) by Robert Wagner

    Weather was clear and cold (25 degrees Fahrenheit). Creek was clear with a moderate and steady current. Since my observation location was changed, this is my first observation at this location.

  • 31 January 2026

    DuPage River Park - Small Pond - Site 2 by Leah Gladkowski

    Ice was on 2/3 of the lake. The water lvel was really low. Saw, what I think was, a muskrat swimming across the lake.

  • 31 January 2026

    Forest Preserves of Cook County - Kickapoo Woods by David Schmid

    I was not able to get a chloride measurement for the month of January 2026. The Little Calumet River at this site was frozen over.

  • 31 January 2026

    Forest Preserves of Cook County - Burnham, Illinois by David Schmid

    I did not take any chloride readings during the month of January 2026. The lake was frozen over.

  • 31 January 2026

    Jefferson Ave Bridge, Naperville, West Branch DuPage River by Julie Kulak

    the river was mostly iced over - I collected my sample from a small open channel on the east side of the river (on the left in the photo).

  • 31 January 2026

    Lily Cache Creek at Rockhurst Rd by Meg Bozarth

    Couldn’t get a sample, frozen solid from the recent negative temps.

  • 31 January 2026

    Lily Cache Creek at the Lily Cache Sports Field footbridge by Meg Bozarth

    Couldn’t get a sample, it’s frozen solid from the recent negative temps.

  • 31 January 2026

    Westernmost bridge in Dunning Read Natural Area Park by Erika Street Hopman

    Unable to do a chloride test because the water is frozen after a week of sub zero temperatures

  • 31 January 2026

    West Branch DuPage River at Naperville Riverwalk by Amy Phillips