A river vessel is defined as almost any boat/ship/barge that is able to navigate a river.
Barge
BARge
A dredge.
"A dream is like a river" "A dreamer's just a vessel"
There are many vessels on the river and picking just one is an impossible task.
A billyboy is a flat-bottomed river barge or coasting vessel.
Cufa
Offshore patrol vessels have much deeper hulls, and tend to be larger vessels, overall. An offshore vessel has to deal with weather conditions a river patrol vessel will not have to, and generally stays out for longer periods of time.
Another word for a river vessel is a "barge." Barges are flat-bottomed boats designed for transporting goods along rivers and canals. They are often towed or pushed by tugboats, making them efficient for inland waterway transport.
there are rapids not very far upstream
One prolonged blast from the horn of another vessel indicates reduced visibility (and the presence of that vehicle). The reduced visibility may be due to geography, such as a river with significant bends, or weather features, such as fog.
the PWC