US Army Corps of Engineers
Jacksonville District Website

The first step in work phase is to get divers into the water to clear and clean the needle slots, which are under the water on the bottom of the lock chamber. Needles, which look like metal panels, will be installed into the needle slots. The needle system serves as a temporary “cofferdam” to isolate a part of the structure for dewatering.
The first step in work phase is to get divers into the water to clear and clean the needle slots, which are under the water on the bottom of the lock chamber. Needles, which look like metal panels, will be installed into the needle slots. The needle system serves as a temporary “cofferdam” to isolate a part of the structure for dewatering.

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Photo by: Erica Skolte |  VIRIN: 180605-A-ZO284-051.JPG