What is it?

[Wallco99]

We passed this at the Wye on Monday, Backhoe on barge digging something. Piles of rocks, tree parts, and and what appears to be, at least from a distance,  dumpsters of dry dirt on board. Does anyone know what this is?

[DCCrabber]

they do sea walls.  boulders for the rip rap and prevents erosion.  dirt for back fill or removed to for the rip rap replacements along with the tree debris

[jack1747]

What DCCrabber said..  It's called a "Spud Barge".