Seen from above, a steam locomotive passes between the Pillars of Hercules rock formation along the Columbia River. Trees line the riverbank and rocks and trees are partially submerged in the river close to the...

Seen from above, a steam locomotive passes between the Pillars of Hercules rock formation along the Columbia River. Trees line the riverbank and rocks and trees are partially submerged in the river close to the...

A black and white photograph of what has been identified as a wooden burial structure on the top of Memaloose Island in the Columbia River. At least 18 skulls and half a dozen long bones sit on top of the board...

A black and white photograph of what has been identified as a wooden burial structure on the top of Memaloose Island in the Columbia River. At least 18 skulls and half a dozen long bones sit on top of the board...

Colored image. Close-in view of the Pillars of Hercules rock formation as seen from the vista of the Columbia River, facing the riverbank. In the foreground is the riverbank where it touches upon a sandy beach....

Black and white image showing construction on the Ariel Dam. In the distance are trees along the top of the hillside. In the upper right of the picture is a wooden structure consisting of scaffolding and a...

Black and white image showing construction on the Ariel Dam. In the distance are trees along the top of the hillside. In the upper right of the picture is a wooden structure consisting of scaffolding and a...

A black-and white photograph of a group of men on a bank of the Columbia River. On the bank lies a fishing seine or net, which some of them are still hauling out of the water. Dark floats can be seen at the...

A black-and white photograph of a group of men on a bank of the Columbia River. On the bank lies a fishing seine or net, which some of them are still hauling out of the water. Dark floats can be seen at the...

A colored photograph with the caption "Columbia River Log Raft ready for Ocean Voyage, Another raft under construction in background". In the foreground on the left side of the photo are log pilings and what...