These Chaco rivers are obstructed by sand bars and snags, which could be removed only by an expenditure of money unwarranted by the present population and traffic. In the southern pampa.
These streams are navigable for short distances, but are obstructed by sand-bars at their mouths, that of Cotinguiba being especially dangerous.
Most of the rivers flowing into the Gulf are obstructed by sand-bars and navigable only during high-water from January to April.
The others are either difficult of access, or are rendered practically useless by dangerous reefs, sand bars and shoals.
The river-mouths are obstructed by sand bars and admit small vessels only.