What is "wallamet"

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Wallamet was a sidewheel-driven steamboat that operated on the Willamette and Columbia rivers in Oregon and later on the Sacramento and San Joaquin rivers in California. Built in a Mississippi river style that was not suited to the conditions of these rivers, and suffering from construction defects, Wallamet was not a financially successful vessel. The name of this vessel is often seen spelled as Willamette.