The 50 meter long towboat William E. Porter allided with a bridge on the Monongahela River near Pittsburgh, Pennsylvania.  The towboat with three loaded coal barges struck the pilings of the Hot Metal Bridge.  No reports of damage to the vessels or the bridge.   The vessels were inspected and allowed to proceed to its destination of South Point, Ohio.   Authorities inspected the bridge and reopen it to traffic a short time later.   The Coast Guard has launched an investigation into the incident.   Reports suggest the high water and fast current may have been a factor.