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Mar 1856-
Apr 1856
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The U.S. Army constructs a blockhouse at Fort Yamhill
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1861
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The Civil War requires transfer of soldiers to the east, but the U.S. Army retains the blockhouse against potential threat from pro-South sympathizers
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c. 1866
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The U.S. Army decommissions Fort Yamhill and auctions its buildings, but the blockhouse is left in place
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1911
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Threatened with demolition, the Fort Yamhill Blockhouse is moved by preservationists 30 miles northwest to Dayton
