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Illinois Historic Preservation Agency
06/17/2026 | Press release | Distributed by Public on 06/18/2026 15:38
Heidecke Lake reopening to anglers in time for Illinois Free Fishing weekend
Historically low water levels and unsafe conditions prevented earlier reopening
SPRINGFIELD - The Illinois Department of Natural Resources (IDNR) will reopen Heidecke Lake in Grundy County to boaters on Friday, June 19. The traditional April 1 opening of the lake was delayed because of unusually low water levels caused by drought conditions this spring.
Located near Morris, Heidecke Lake is a former cooling lake for a power generation plant. IDNR leases the site to provide public outdoor recreational opportunities.
For the first time since the utility site was decommissioned in 2007, water levels at Heidecke Lake dropped too low to allow safe navigation by boats and other watercraft, as well as by first responders who could be called upon to conduct rescues on the lake. In the interest of public safety, IDNR officials chose to delay reopening the lake to boaters.
Ideal water levels for the lake are about 510 feet, with safe navigation for watercraft typically possible at 508 feet or higher. The lake reached 508 feet as of Thursday, June 18.
Shallow areas persist throughout the lake. Boaters must exercise caution while launching and navigating and remain aware of their surroundings. Boaters also should abide by all normal lake rules.
"Heidecke Lake is a popular spot for anglers, and IDNR appreciates their patience as department staff carefully monitored water levels to ensure safety for all who enjoy recreating on this lake," said IDNR Director Natalie Phelps Finnie. "We look forward to welcoming boaters back just in time for Illinois Free Fishing Days June 19-22."
IDNR staff will continue to monitor water levels in the lake. Questions can be directed to the Heidecke Lake site office at 815-942-6352.
About IDNR
The Illinois Department of Natural Resources was established in 1925 as the Illinois Department of Conservation, bringing under one umbrella oversight of fish and game, forestry, public works, and lakes. Today, IDNR's work encompasses management of about 400 sites across Illinois, including state parks and historic sites; wildlife, fisheries, forestry, and natural heritage; Lake Michigan water allocation and coastal management; conservation police; mines and minerals; oil and gas; issuance of licenses, permits, and numerous grants; the World Shooting and Recreational Complex in Sparta; and the Illinois State Museum. Visit https://dnr.illinois.gov and follow us on Facebook , YouTube and LinkedIn .
Illinois Historic Preservation Agency published this content on June 17, 2026, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on June 18, 2026 at 21:38 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]