United Railways
Oregon
Helvetia Road Trestle (Washington County, Oregon)
Built 1911Beam bridge over NW Helvetia Road on Portland & Western RailroadOpen to traffic
PNWR - Holcomb Creek Trestle (Washington County, Oregon)
Built ca. 1905 for the interurban Oregon Electric RailwayTimber stringer bridge over Holcomb Creek and Dick Road on Portland and Western RailroadOpen to traffic