This is a list of properties and historic districts in Washington that are listed on the National Register of Historic Places. There are at least three listings in each of Washington's 39 counties.
This is a list of properties and historic districts in Oregon that are listed on the National Register of Historic Places. There are listings in all of Oregon's 36 counties.
Alsea is an unincorporated community in Benton County, in the U.S. state of Oregon. It is on Oregon Route 34 and the Alsea River. For statistical purposes, the United States Census Bureau has defined Alsea as a census-designated place (CDP). The census definition of the area may not precisely correspond to local understanding of the area with the same name. As of the 2020 Census, the population was 165.
The following list presents the full set of National Register of Historic Places listings in Multnomah County, Oregon. However, please see separate articles for listings in each of Portland's six quadrants.
Irish Bend Covered Bridge is a wooden covered bridge near Corvallis, Oregon, United States. It was constructed in 1954 and originally spanned a slough of the Willamette River on Irish Bend Road near Monroe. However, in 1975 Irish Bend Road was realigned and the bridge fell into a state of disrepair. The bridge was added to the National Register of Historic Places in 1979. It was eventually dismantled in 1988 to make way for a more modern concrete span. Through negotiations with Benton County and Oregon State University (OSU), an agreement was reached to reconstruct the bridge on university property. $30,000 was raised by the Irish Bend Advisory Committee, and Benton County provided an additional $30,000 to fund the project, which was completed in 1989. Due to the relocation, the bridge was removed from the National Register in 1989. It was relisted in 2013.
Wildcat Creek Bridge is a covered bridge built in 1925 at Austa, near Walton, in the U.S. state of Oregon. It uses Howe truss engineering and was listed on the National Register of Historic Places in 1979. The 75-foot (23 m) bridge carries Austa Road over Wildcat Creek near its confluence with the Siuslaw River.
Hayden Bridge, a Howe truss structure, spans the Alsea River about 2 miles (3 km) west of Alsea, Oregon, United States. Constructed in 1918, the 91-foot (28 m) span is one of only seven remaining covered bridges in Oregon that were built before 1920. Similar spans such as the Mill Creek Bridge crossed the Alsea or one of its tributaries in the same vicinity, but only the Hayden Bridge has survived. It was added to the National Register of Historic Places in 1979.
