Multibeam Sonar Image of Lock Wall
A multibeam sonar was used initially to inspect the underwater wooden cribbing that supports the concrete guidewall at Locks and Dam 15. The cribbing, shown here near the bottom of the image as alternating black and colored stripes, did not appear to be damaged and therefore a dive team was called in for further investigation.

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Photo by: Seaside Engineering and Surveying, LLC |  VIRIN: 150616-A-VX113-001.JPG