Half viaduct
Image:HAER HCRH OR-36-J-6.jpg|thumb|A half viaduct on the Historic Columbia River Highway
A half viaduct is a type of viaduct built into a hillside, where only part of the road is supported by the structure.
Image:HAER HCRH OR-36-J-6.jpg|thumb|A half viaduct on the Historic Columbia River Highway
A half viaduct is a type of viaduct built into a hillside, where only part of the road is supported by the structure.