Safety Zone; Lake Michigan, Chicago, IL

What it does

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.

The Coast Guard's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 33 of the Code of Federal Regulations:

33 CFR 165

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Coast Guard has published 341 final rules in 2026 so far, compared with 224 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

227 earlier Federal Register documents under regulation identifier 1625-AA00 since Jan. 1, 2025.

• Aug. 10, 2026 Temporary final rule. Safety Zone; Lake St. Clair; Grosse Pointe Farms, MI
• Aug. 7, 2026 Notice of proposed rulemaking. Safety Zone; WHALE Floating Production System Outer Continental Shelf Facility, Alaminos Canyon 773, Gulf of America
• Aug. 7, 2026 Notice of proposed rulemaking. Safety Zone; Chevron GENESIS SPAR Outer Continental Shelf Facility, Green Canyon Block 205A, Gulf of America
• Aug. 6, 2026 Temporary final rule. Safety Zone; Rockport Illuminations Fireworks, Rockport Harbor, Rockport, MA
• Aug. 6, 2026 Temporary final rule. Safety Zone; Lake Erie, Madison Township, OH
• Aug. 6, 2026 Temporary interim rule. Safety Zone; St. Johns River, Jacksonville, FL
• Aug. 4, 2026 Temporary final rule. Safety Zone; Ohio River; River, Aurora, IN
• July 31, 2026 Temporary final rule. Safety Zone; Fireworks Display, Ohio River, Follansbee, WV

Since then:

• Aug. 12, 2026 Temporary final rule. Safety Zone; T/V DENISE FOSS (O.N. 1254223), Honolulu, HI
• Aug. 14, 2026 Temporary final rule. Safety Zone; Atlantic Ocean, Culebra, Puerto Rico
• Aug. 14, 2026 Temporary final rule. Safety Zone; St. Clair River; Port Huron, MI
• Aug. 14, 2026 Temporary final rule. Safety Zone; West Passage Narragansett Bay, Narragansett, RI
• Aug. 17, 2026 Temporary final rule. Safety Zone; Fox River, Green Bay, WI
• Aug. 18, 2026 Final rule. Safety Zone; ANCHOR Floating Production Unit (FPU) Outer Continental Shelf Facility, Green Canyon Block 763, Gulf of America
• Aug. 18, 2026 Temporary final rule. Safety Zone; Lake Michigan, Gary, IN
• Aug. 21, 2026 Temporary final rule. Safety Zone: Piers Park, Boston Inner Harbor, East Boston MA
• Aug. 24, 2026 Temporary final rule. Safety Zone; T/V DENISE FOSS (O.N. 1254223), Honolulu, HI
• Aug. 26, 2026 Temporary final rule. Safety Zone; Spring Lake, Fruitport, MI
• Aug. 26, 2026 Temporary final rule. Safety Zone; Lake St. Clair; New Baltimore, MI
• Aug. 27, 2026 Temporary final rule. Safety Zone; Aerial Displays, Upper Bay, New York, NY
• Aug. 28, 2026 Final rule. Safety Zone; Hurricanes, Tropical Storms, and Severe Weather Events in the Sector Mobile Captain of the Port Zone
• Sept. 1, 2026 Temporary final rule. Safety Zone; Fort Myers Beach, FL
• Sept. 2, 2026 Temporary final rule. Safety Zone; Maumee River, Toledo, OH
• Sept. 2, 2026 Temporary final rule. Safety Zone; Lake St. Clair, Grosse Pointe Farms, MI
• Sept. 2, 2026 Temporary final rule. Safety Zone; Bay Bridge Paddle; Chesapeake Bay, Annapolis, MD
• Sept. 3, 2026 Temporary final rule. Safety Zone; Outer Harbor, Buffalo, NY
• Sept. 8, 2026 Temporary final rule. Safety Zone; Laguna Madre, South Padre Island, TX
• Sept. 11, 2026 Temporary final rule. Safety Zone; York River, Yorktown, VA
• Sept. 14, 2026 Temporary final rule. Safety Zone; Lake Erie, Oregon, OH
• Sept. 15, 2026 Temporary final rule. Safety Zone; Rocket Test Site, Rio Grande River, Boca Chica, TX
• Sept. 15, 2026 Temporary final rule. Safety Zone; Calcasieu River Channel, Lake Charles, LA
• Sept. 16, 2026 Temporary final rule. Safety Zone; Lake St. Clair, Grosse Pointe Farms, MI
• Sept. 17, 2026 Temporary final rule. Safety Zone; Key West Main Ship Channel, and Fleming Key Cut, Key West, FL
• Sept. 21, 2026 Temporary final rule. Safety Zone; Illinois River, Morris, IL
• Sept. 22, 2026 Notice of proposed rulemaking. Safety Zone; Neuse River, New Bern, NC
• Sept. 23, 2026 Temporary final rule. Safety Zone; Zach's Bay, Wantagh, NY
• Sept. 23, 2026 Notice of proposed rulemaking. Safety Zone; Massachusetts Bay, Boston, MA
• Sept. 29, 2026 Temporary final rule. Safety Zone; Bridge Demolition, Upper Mississippi River, Chester, IL
• Oct. 1, 2026 Temporary final rule. Safety Zone; St. Lawrence River, Massena, NY
• Oct. 1, 2026 Notice of proposed rulemaking. Safety Zone; Sector Mobile Captain of the Port Zone, Mobile, AL
• Oct. 6, 2026 Notice of proposed rulemaking. Safety Zone; Red Bull Flugtag, Intercoastal Waterway, Biscayne Bay, Miami, FL
• Oct. 7, 2026 Final rule. Security Zone; U.S. Coast Guard Base, Los Angeles Harbor Main Channel, Los Angeles, CA
• Oct. 7, 2026 Temporary final rule. Safety Zone; Luminsea Miami Shootout and Races, Miami Marine Stadium Harbor, Miami FL
• Oct. 15, 2026 Temporary final rule. Safety Zone; Lake Michigan, Chicago, IL
• Oct. 16, 2026 Temporary final rule. Safety Zone; Atlantic Ocean, Culebra, Puerto Rico
• Oct. 16, 2026 Notice of proposed rulemaking. Safety Zone; Cumberland River, Hendersonville, TN
• Oct. 19, 2026 Notice of proposed rulemaking. Safety Zone; FRL Inaugural Invitational eFoil Exhibition Race, Miami Marine Stadium Basin, Miami, FL
• Oct. 21, 2026 Temporary final rule. Safety Zone; T/V DENISE FOSS (O.N. 1254223), Honolulu, HI
• Oct. 22, 2026 Temporary final rule. Safety Zone; Brownsville Ship Channel, Brownsville, TX
• Oct. 27, 2026 Notice of proposed rulemaking. Safety Zone; Southern California Annual Firework Events for the Los Angeles-Long Beach Captain of the Port Zone
• Oct. 29, 2026 Final rule. Safety Zone; Firework Display; Cumberland River, Hendersonville, TN
• Oct. 30, 2026 Temporary final rule. Safety Zone; S.S. UNITED STATES Dead Ship Tow, Sector Mobile Captain of the Port Zone, Mobile, AL
• Oct. 30, 2026 Temporary final rule. Safety Zone; M/T KALAHARI, Gulf of America, Pascagoula, MS
• Nov. 4, 2026 Temporary final rule. Safety Zone; Lake Michigan, Chicago, IL
• Nov. 5, 2026 Notice of proposed rulemaking; correction. Safety Zone; FRL Inaugural Invitational eFoil Exhibition Race, Miami Marine Stadium Basin, Miami, FL; Correction

What happens next and when

This rule is effective from 6 a.m. through 10:30 a.m. on August 23, 2026.

The agency's dates, word for word.

Check it yourself

• The document in the Federal Register
• Docket USCG-2026-1004 on Regulations.gov
• Title 33 on eCFR

The record as published

Source: the Federal Register (public domain). The document in the Federal Register