Applies to river work only.

Code 6003 applies to employers engaged in the construction of a jetty, breakwaters, sea walls, groynes, dikes, revetments etc.  A jetty involves more construction than a dike or a levee in that it must extend into a body of water.  A jetty is constructed of heave timber cribbing filled with boulders or heavy stone.

The construction of a dike included in this classification involves operations in which an embankment of earth is thrown up along the edge of the river.  Then embankment is very frequently paved with loose stone.  In addition to the stones, the embankment may be anchored by lumber or willow mattresses, which are laid against the surface of the dike and held down by stone or piling.