Wildlife Crossing Article Published in Pacific Northwest Trenchless Review

Each winter and early spring, northern red-legged frogs migrate between upland forest habitat in the Tualatin Mountains and breeding wetlands along the Columbia River. For years, that journey required crossing US 30, creating a need for a safer, permanent habitat connection beneath an active transportation corridor.

Trenchless Technical Practice Lead Brendan O’Sullivan and Professional Engineer Brandon Falk co-authored this article on page 30 of the NASTT Pacific Northwest Trenchless Review 2026. The article details how the project team evaluated trenchless methods, selected pipe ramming for the site’s constrained conditions, and delivered a wildlife underpass that supports frog migration while maintaining highway and rail operations during construction.