Lastly it is worth noting any usual features like sunken logs, projecting tree roots and big boulders.

Dead head--The end of a sunken log that protrudes above the surface of a river.

Beaver ponds provide an excellent habitat, as they are found hidden in the safety among sunken logs and downed brush.

"As if the boat perhaps had struck a sunken log?"

During the day, it generally hides under shelter such as reef overhangs or sunken logs, either singly or in groups.

Bullheads usually use a natural cavities or make saucer shaped depressions near submerged cover, such as a trees roots or a sunken log.

As they were swept away, rising and falling, an arm broke surface like the branch of a sunken log.

It prefers the sandy and rock filled shoreline where sunken logs are easily accessed.

His normal behavior is to hang out like a sunken log on the bottom of his habitat.

The upper Columbia was choked with snags, which were sunken logs jammed in the river bottom and sticking into the river.