The following is from the CG 9th District NTM 15/13.
From April 15 through May 30, 2013 between the hours of 0700 an 1700, Monday through Saturday, an 80 foot by 28 foot barge will be working
under the 92nd Street Bridge at Mile 0.76 over the Calumet River. The barge will move to accommodate vessels if a 2-hour advance notice is
provided directly to the bridge on VHF-FM Marine Radio Channel 16. When the bridge is in the open position workers will be suspended on swing scaffolding. Spotters will warn workers of approaching vessels but mariners should use caution when transiting the bridge throughout the maintenance period.