Half Viaduct

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Austins Point Half Viaduct (Clatsop County, Oregon)
Built 1933
Timber stringer bridge over Austins Point on US 101
Open to traffic

Cape Perpetua Half-Viaduct (Lincoln County, Oregon)
Built 1931
Stringer bridge over Cape Perpetua Chasm on US 101
Open to traffic

Crown Point Viaduct (Multnomah County, Oregon)
Built 1914
Bridge over Crown Point on Historical Columbia River Highway
Open to traffic

Eagle Creek Viaduct (Multnomah County, Oregon)
Built 1915, Closed 1937, Re-opened as trail 1995
Concrete deck girder bridge over Tooth Rock slopes on Historical Columbia River Highway
Open to pedestrians

Juniper Point half viaduct (Umatilla County, Oregon)
Built 1936
Concrete tee beam bridge on US 730
Open to traffic

Minam Viaduct (Union County, Oregon)
Built 1941 Replaced 2012
Lost Bridge
No longer exists

Mitchell Point Viaduct (Hood River County, Oregon)
Built in 1915 bypassed 1954 demoilsed 1966
Lost Concrete tee beam bridge on US 30
Demolished

Prescott Point Viaduct (Columbia County, Oregon)
Built 1918
Abandoned concrete tee beam bridge on Former US 30
Derelict/abandoned

Rock side viaduct (Hood River County, Oregon)
Built 1921
Concrete tee beam bridge on Fromer US 30
Open to pedestrians only

Ruthon Point Viaduct (Hood River County, Oregon)
Built 1918
Concrete tee beam bridge on Formerly US 30
Intact but closed to all traffic

SR 11 half-Viaduct (Skagit County, Washington)
Half viaduct Over Hillside
Open to traffic

Tooth Rock Viaduct (Multnomah County, Oregon)
Built 1915, Closed 1937, Re-opened as trail 1995
Concrete deck girder bridge over Tooth Rock slopes on Historical Columbia River Highway
Open to pedestrians

West Multnomah Falls Viaduct (Multnomah County, Oregon)
Built 1914
Bridge over rocky terrain along railroad tracks on Historic Columbia River Highway
Open to traffic