Wapato (Sagittaria latifolia)

they laid Several parsles of Wappato at my feet, & begged of me to take out the bad fire...

and as my pilot informed me was gorn up to this fall to fish which is 2 days or 60 miles up.
William Clark

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Round bulbs that appear similar in size and shape to a medium-sized onion.

Photo described at Life for the Curious blog

Parker Landing

This morning we came to a resolution to remain at our present encampment or some where in this neighbourhood untill we had obtained as much dryed meat as would be necessary for our voyage as far as the Chopunnish. to exchange our perogues for canoes with the natives on our way to the great falls of the columbia or purchase such canoes from them for Elkskins and Merchandize as would answer our purposes.
Meriwether Lewis

Learn more: Captain William Clark Regional Park

Photo date: March 29, 2009

Looking at the Columbia River from a sandy beach

Mouth of the Willamette River

The Current of the Multnomar is as jentle as that of the Columbia glides Smoothly with an eavin surface, and appears to be Sufficiently deep for the largest Ship. I attempted fathom it with a Cord of 5 fathom which was the only Cord I had, could not find bottom 1/3 of the distance across.
William Clark

Photo date: March 30, 2009
Some modern artifacts have been obscured.

Looking at the Columbia River from a sandy beach