Old Ledbetter Bridge drops additional inch --classifieds

Kentucky Transportation Cabinet engineers and inspectors say the have detected an additional 1 inch of movement in west approach spans on the Old Ledbetter Bridge during the last 24 hours.  The approach spans have moved about 3.25 inches total in the last three days.  There has also been additional movement of soil along the bluff near the bridge on the McCracken County side of the Tennessee River.

Engineers have been monitoring the bridge every few hours since April 30^th, when they received word two approach span sections on the McCracken Side of the bridge had dropped about 2 ft.  The Old Ledbetter Bridge has been closed and awaiting demolition since traffic moved to the New US 60 Tennessee River Bridge on July 31, 2013.

The additional 1 inch of movement came after about 1 inch of rain in a 24 hour period.  Another inch of rain is possible before precipitation trails off tonight, prompting McCracken County Emergency Management Agency officials to touch base with nearby residents to remind them to be alert for signs of land moving along the bluff.

McCracken County Emergency Management Director Jerome Mansfield was returning from a disaster planning conference in Lexington to continue monitoring the area.

In additional to the 1 inch of movement at a monitoring point on the bridge deck, inspectors said a concrete stairway that they used to access the lower part of the bluff on April 30^th slid down the bluff with moving soil.

When they first investigated on April 30^th, inspectors found a land slip along the bluff below the bridge had moved two of the land-based piers.   Since that initial investigation, inspectors have regularly checked the aging structure for additional signs of movement.

According to KYTC Spokesman Keith Todd, the Kentucky Transportation Research Center is sending a seismic sensor that will be attached to the bridge to alert inspectors to any substantial shift in the sagging approach spans.

“We expect to have the sensor on site for installation sometime Thursday.  Nearby resident Bill Schroeder has offered to temporarily supply power to the sensor until it can be attached to a more permanent power supply,” Todd said.

While an earlier assessment indicated a collapse of the approach spans is not likely to impact the main truss over the river navigation channel, the continued movement of the approach prompted engineers to step up a number of ongoing activities:

• Regular monitoring of the approach spans for additional movement
• Placement of a seismic sensor on the approach spans (Likely Thursday)
• Placement of solar powered navigation lights on the main span and piers in case an approach span collapse cuts power to the bridge
• Continued negotiations with contractors in an effort to expedite demolition of the bridge
• Continued communication with the US Coast Guard about developments at the site
• Continued interaction with McCracken County Emergency Management 

At this time, no evacuation of homes along the bluff has been ordered.  Emergency management personnel have talked to nearby homeowners to update them on additional movement of land along the bluff.

While vehicular traffic was moved off the Old Ledbetter Bridge last July when the New Ledbetter Bridge opened to traffic, the stability of the bridge is still of concern to river traffic.

The Old Ledbetter Bridge opened to traffic in 1931.  It was restricted to a 3-ton load limit in January 2012 while the new bridge was under construction just upstream.  KYTC officials expedited construction of the new bridge and it opened to traffic on July 31, 2013, eleven months ahead of schedule.

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