The navigable channel on Lake Zoar under the Rochembeau Bridge is closed again as Middlesex Corporation replaces the span carrying Interstate 84 over the water.  The closure started today and ends October 5th. The channel will be reopened during the weekends on September 24th and 25th and October 1st and 2nd for the boating public. This closure will be for setting structural steel girders and cross frames at Span 2 of the Bridge.  Contractors say the closure will ensure the safety of any nearby marine traffic during this operation. If operations to set the new structural steel are completed prior to October 5th, Middlesex Corporation will re-open the channel and notify the appropriate authorities of completion. Additional closure signage will be installed prior to the closure in accordance with the approved boat safety plan.