Safety Zone; Lake Michigan, Chicago, IL

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Homeland Security Coast Guard 33 CFR Part 165 [Docket Number USCG-2026-1004] RIN 1625-AA00 AGENCY: Coast Guard, Department of Homeland Security. ACTION: Temporary final rule. SUMMARY: The Coast Guard is establishing a temporary safety zone for navigable waters within a small area of Monroe Harbor in Lake Michigan in Chicago, IL. This action is necessary to protect personnel, vessels, and the marine environment from potential hazards created by the Chicago Triathlon swim event. Entry of vessels or persons into this zone is prohibited unless specifically authorized by the Captain of the Port, Sector Lake Michigan or their designated representative. DATES: This rule is effective from 6 a.m. through 10:30 a.m. on August 23, 2026. ADDRESSES: To view available documents go to https://www.regulations.gov and search for USCG-2026-1004. FOR FURTHER INFORMATION CONTACT: If you have questions about this rule, call or email Lieutenant Kyle Goetz, Marine Safety Unit Chicago, U.S. Coast Guard; telephone 630-986-2155, email D09-SMB-MSUChicago-WWM@uscg.mil . SUPPLEMENTARY INFORMATION: I. Table of Abbreviations CFR Code of Federal Regulations DHS Department of Homeland Security FR Federal Register NPRM Notice of proposed rulemaking § Section U.S.C. United States Code ( printed page 51593) II. Background and Authority The Coast Guard received notification that the Chicago Triathlon will be taking place within a small area of Monroe Harbor on Lak…