Dataset

Winter Chloride Watch

Dataset by National Great Rivers

Dataset summary

Observations

  • 15 February 2026

    Woodscreek Park: 3 Pipe Inlet, Ackman Rd and Golf Course Rd, Crystal Lake, Il by Songjie Su

    Unseasonably spring like weather in upper 50F toward 60f, past month snow, freeze starting to melt from past week, and the week or so following.

  • 15 February 2026

    Riverview Farmstead Preserve Naperville IL South of 111th St & Book Rd by Thomas Cowan

    Test was taken Sunday February 15, 2026 at 1:50pm. Full Sun and 60 degrees with no wind. Water sample was taken from river Bank about 15' out into water. Depth of water was about 12" to 18" deep. River was flowing but was fairly shallow.

  • 15 February 2026

    Kane County Forest Preserve near Barnes Rd by Jane Davis

    I did two samples today. The creek was frozen but I was able to dip water out of a small hole surrounding a stick about 2 feet away from the bank. Sample 2 was also 94 ppm.

  • 15 February 2026

    Forest Preserves of Cook County - Kickapoo Woods by David Schmid

    Ice had cleared in the current, allowing me to take the chloride sample. I did not take a site photo. Sorry.

  • 15 February 2026

    Prentiss Creek in Downers Grove (1911 Prentiss St.) by Patricia Weikersheimer

  • 15 February 2026

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

    I did not take a chloride reading today. The lake was frozen over. Sorry, no photo taken.

  • 15 February 2026

    Park 571 by Emerald Adler

    This was the validation test. 236 ppm

  • 15 February 2026

    Ping Tom Park Chicago by Emerald Adler

    This was the validation test. 219 for both.

  • 14 February 2026

    Lake Run at Nelson Lake in Dick Young Forest Preserve by Maureen Mrenna

    Actual ppm below 28. Actual quantabs 0.4 so chloride ppm below chart Note: ice was only partially unfrozen - places with water still had ice underneath the couple inches of liquid water. I will do another reading when creek more thawed.

  • 14 February 2026

    Kishwaukee River South Branch at Russell Woods by Rachel Ford

    The river was fully iced over at my usual location under the bridge, so I walked upriver about a tenth of a mile to a spot where the ice was gone and the river was running fairly swiftly near the bank.

  • 14 February 2026

    South Branch of Kishwaukee River at N. 1st Street by Patty Ruback

    Very smelly discharge (with a sheen on the water) is coming out of the drain included in the pictures. It drains JUST downstream of my sampling location.

  • 13 February 2026

    Kenyon Woods Forest Preserve by Michelle Besch

    Chloride level was higher, however, the testing conversion card only goes to 622. Ice on, but melt in multiple areas. Took two samples for quality control

  • 13 February 2026

    Lacey Creek at Morton Arboretum by Lisa Warren

    Quntab 9 but sheet only goes to 7.8 (value greater than 622)

  • 13 February 2026

    Fabyan Forest Preserve by Maureen Huey

    Corrected reading on the right.