USS Willamette was a proposed United States Navy screw sloop-of-war or steam frigate that was cancelled in 1866 without ever having been laid down.

Willamette was a wooden-hulled bark-rigged[1] (or ship-rigged[2]) Contoocook-class screw sloop-of-war[1] or steam frigate[2] with a single funnel slated to be built for the Union Navy late in the American Civil War.

The contract for her construction was cancelled in 1866 before her keel was laid.

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