Dataset

Winter Chloride Watch

Dataset by National Great Rivers

Dataset summary

Observations

  • 20 December 2025

    West Branch Dupage River by Gerry Gorman

    Bailey bridge, lots of salt on roads nearby, rain 48 hours earlier

  • 19 December 2025

    West branch of DuPage river at Beecher Rd, Winfield by Chris Thomson

  • 19 December 2025

    Lacey Creek at Morton Arboretum by Lisa Warren

    PPM >622 (Quantab reading was 8.4, Conversion chart only goes to 7.8)

  • 19 December 2025

    Winfield Creek at Emerson School by Maureen Keil

    The creek is half covered with ice, with current flowing in the center

  • 19 December 2025

    West Branch DuPage River at Hillside by Shari Buma

    Water slushy with pea sized floating ice

  • 19 December 2025

    Central Park at Oak Brook Park District by Sally Beaumont

    Creek is iced over but at the bridge sampling location the water is open and flowing. Temperature is rising to -5 C with sunny skies and winds WSW 10 - 20 mph.

  • 18 December 2025

    Villa Ave Bridge at Sugar Creek by Joe Neilly

    Mallards swimmeng nearby

  • 18 December 2025

    Glen Crest Creek - Lincoln Hill by Richard Whitney

    View looking north. Sample collected next to large rock near left bank.

  • 18 December 2025

    SCGW bridge on Salt Creek by Joe Neilly

    First time observed oil on creek. Lots of melting snow form recent snowstorms.

  • 18 December 2025

    St. Joseph's Creek @ 59th & Williams Street by Jon Yeater

    Creek had been froze over for sometime, even up to yesterday (12/17), and there is still ice under the water towards the bottom of the creek at the test spot. We had an unseasonal warm up to ~50 degrees F the day of the observation, recieved approximately a quarter inch of rain, and then the temperature dropped back into the lower teens moving into 12/19.

  • 18 December 2025

    Glencrest creek south of Bemis Road by Lance Lambert

    actual read was 8.2. But Conversion Chart only goes up to 7.8, so I assume chloride is actually >622 ppm. Sample was collected just down stream from culvert draining Bemis Rd