This is the 9737th most frequent Spanish word.
atravesado
"Atravesado" means "stuck, obstructed, or crossed."
Here, 'atravesado' is used to describe the river having a bridge across it.
El río estaba atravesado por un puente viejo.
The river was crossed by an old bridge.
'Atravesada' in this context means contrary or obstructive, referring to someone's behavior.
Se comportó de manera atravesada durante toda la reunión.
He behaved in a contrary manner throughout the meeting.
'Atravesado' describes the state of the trunk being laid across the path obstructively.