 On the morning of June 28, 1983, a section of the Mianus River Bridge in Cos Cob collapsed, plunging northbound I-95 traffic into the Mianus River below, killing three.The collapse was blamed on the failure of the steel pins to hold the horizontal beams together and inadequate inspection prior to the collapse.Northbound traffic was diverted on this section of I-95 for 25 days.