The Strap Iron Corral, located about north of Hooper, Washington, is a historic corral built in the 1870s by "Uncle Jim" Kennedy. and It was constructed of native rough-hewn lumber connected by 2.38-inch iron straps, once used as a cap for wooden rails of the Columbia River Railroad. This was converted to solid iron rails in 1875, and at least some of the straps were sold to Kennedy.https://npgallery.nps.gov/GetAsset/0763db31-c664-4bc8-9134-ed09bfb141da
It was listed on the National Register of Historic Places in 1975.
See also National Register of Historic Places listings in Washington state
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