Dataset

Winter Chloride Watch

Dataset by National Great Rivers

Dataset summary

Observations

  • 12 December 2025

    Fox River by Julie Chadwick

    The location on the north tip of the island was solid ice so I wasn't able to get a sample there. I sampled the water from the other side of the water, which was just a few yards across from the original site.

  • 12 December 2025

    Nippersink Creek at the Keystone Landing in McHenry County Conservation District's Glacial Park Conservation Area by Sue Rose

    45.72 cm (18 inches) of new snow received in the past week as well as some drizzly rain. Conditions were very icy and roads required salting. The past two days have had no precipitation, roads are clear and dry.

  • 12 December 2025

    Chicago River North Branch Goose Island by Jeff Shelden

    The reading of 7.8 quantab units was above the test strip range.

  • 12 December 2025

    Rock Run Creek by Andy Neill

    In the past two weeks we have had to major snow events over 2 inches that brought out the beet juice and salt trucks and snow plows. Note...the Quantab unit was off the chart at 641plus ppm.

  • 11 December 2025

    Fabyan Forest Preserve by Maureen Huey

    Some ice on the river. Not completely covered. A duplicate test strip was used. Reading was 264 ppm.

  • 11 December 2025

    Frank Holten State Park by Jen Hemphill

    Very thin layer of ice along shore, easy to break. Water was very calm.

  • 10 December 2025

    Creek under Fairmount Ave, east side of bridge by Tom Prince

    Quantab units of 8.8

  • 10 December 2025

    Dry Run Creek in Lower Bradley Park by Robert Rowe

    Quantab unit was 8.6 so it was off the chart for ppm.

  • 10 December 2025

    Ron Haimbaugh by Ron Haimbaugh

    Chloride quantab units was 8.4 and there in no corresponding PPM because it's off the scale.

  • 9 December 2025

    Waubonsie Creek by Mary Theodor

    Two strips were tested for accuracy. They didn’t have the same readings. The 1st strip measured at 4.8 / 226 ppm, the 2nd strip measured at 4.6 / 209 ppm.

  • 9 December 2025

    Morgan Creek at Morgan Creek Park by Alyssa Theodor

    Duplicate test strip reading 92 ppm