half viaduct
{{Short description|Type of viaduct}}
Image:HAER HCRH OR-36-J-6.jpg]]
A half viaduct is a type of viaduct built into a hillside, where only part of the road is supported by the structure.{{Cite web |title=State of Oregon: Historic Columbia River Highway - Viaducts |url=https://sos.oregon.gov/archives/exhibits/columbia-river-highway/Pages/design-viaducts.aspx |access-date=2025-02-03 |website=sos.oregon.gov}}