US Army Corps of Engineers
Jacksonville District Website

On the lower end of the lock, crews must work across the girder in wetter conditions, wearing life vests for safety. The rigger or signalman on the barge keeps a close eye on the installation. He uses both a headset and hand signals to indicate “stop” to the crane operator as the second needle is properly fitted in the slot. It takes a significant amount of experience and expertise for a crane operator to maneuver and place each needle down into the small slot, fitting them close enough together that the two pieces can be sealed together with a narrow black seal, visible on the left side of the second needle.
On the lower end of the lock, crews must work across the girder in wetter conditions, wearing life vests for safety. The rigger or signalman on the barge keeps a close eye on the installation. He uses both a headset and hand signals to indicate “stop” to the crane operator as the second needle is properly fitted in the slot. It takes a significant amount of experience and expertise for a crane operator to maneuver and place each needle down into the small slot, fitting them close enough together that the two pieces can be sealed together with a narrow black seal, visible on the left side of the second needle.

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Photo by: Erica Skolte |  VIRIN: 180605-A-ZO284-059.JPG