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POSITIONING SYSTEMS: At the Mel Price Dam, Alton, Illinois

This photo of the Luhr Brothers barge L1007 equipped with a Liebherr 994 excavator was taken by Rodney Linker on October 1.

This photo of the Luhr Brothers barge L1007 equipped with a Liebherr 994 excavator was taken by Rodney Linker on October 1.

The Luhr Bros. L1007 spud barge, equipped with a Liebherr 994 excavator, working at Gatebay #1 at the Mel Price Dam, along with the pushboat MV Sheryl.

Luhr Bros. began this contract for the St. Louis District Corps of Engineers on October 1, 2007, with completion expected within 45 days. The project is to repair scouring adjacent to the dam.

Aided by a ClamVision positioning system, Luhr is placing 14,000 tons of stone in three gradation specifications adjacent to the upstream gatebays. The scours are up to 25 feet deep, in water depths to 70 feet. Quality Assurance is being performed by the St. Louis District’s Survey Vessel Boyer, using multi-beam data and side scan to confirm that all voids are being filled with the specified material.

The finished design is intended to prevent any future loss of scour protection stone along the upstream face of Mel Price dam.

Mike Dunn, a dredge operator in the summer months, is the engineer on this project.

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