SUPPLEMENTARY INFORMATION:

The Coast Guard will enforce a safety zone regulation in 33 CFR 165.930(a)(4) on the main branch of the Chicago River between Michigan Avenue Bridge (Mile Marker 326.5) and the Columbus Drive Bridge (Mile Marker 326.7) for the Chicago Ducky Derby event from 11:30 a.m. until 2 p.m. on August 6, 2026. This action is being taken to provide for the safety of life on the navigable waterway during the Annual Chicago Ducky Derby marine event. Our regulation for marine events within the Great Lakes Coast Guard District, § 165.930(c)(1), specifies that the Captain of the Port (COTP) may enforce this safety zone in whole, in segments, or by any combination of segments. The COTP Lake Michigan may suspend the enforcement of any segment of this safety zone for which notice of enforcement has been given.

Pursuant to § 165.930, during the enforcement period, entry into, transiting, or anchoring within safety ( printed page 46732) zone is prohibited unless authorized by the COTP Lake Michigan or a designated on-scene representative. Additionally, all vessels must obtain permission from the COTP Lake Michigan or designated representative to enter, move within, or exit a safety zone when the safety zone is enforced. Vessels and persons granted permission to enter the safety zone must obey all lawful orders or directions of the COTP Lake Michigan designated representative. Upon being hailed by the Coast Guard by siren, radio, flashing light or other means, the operator of a vessel must proceed as directed.

In addition to this notification of enforcement in the Federal Register , the Coast Guard will provide the maritime community with notification of this enforcement period via Broadcast Notice to Mariners. The COTP Lake Michigan may be reached by contacting the Coast Guard Sector Lake Michigan Command Center at (833) 900-2247. An on-scene designated representative may be reached via VHF-FM Channel 16.

91 FR 46731