The Bureau of Yards and Docks directed the Laboratory to develop a 21-ft wide end-to-end connected NL pontoon causeway suitable for unloading materiel at landing areas subject to extreme tidal ranges.nThe Laboratory developed a 3x15 NL pontoon causeway with a “hinge” type end connection, which can operate in 4-ft to 6-fr waves, be moored in a 40 mile per hour wind, withstand a 3-knot current parallel to beach, and is suitable for operation in areas of extreme tidal ranges. Sixty ton tanks can be moved over the causeway without difficulty;vehicle speeds of 15 mph can be attained in moderate surf.
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