S. 154th St./156th Way Relocation, Sea-Tac International Airport, Port of Seattle, WA

S 154th St 156th Way RelocationBarry Knight managed this project for the Port of Seattle and the City of SeaTac.

The project involved the preparation of preliminary and final designs and PS&E for realigning South 154th St./156th Way and a segment of the Airport Perimeter Road around the north end of the existing runways (16R and 16L) and the new 3rd Runway at STIA. South 154th Street/156th Way is a 2-lane roadway that connects Burien with SeaTac and South Center Mall in Tukwila.

The realignment around the existing runways was necessary to permit the extension of the safety-area fills in accordance with FAA requirements. The road was aligned to minimize wetland impacts, and is an integral part of the safety-area fills, having high retaining walls on each side.

A section of Miller Creek was realigned to accommodate the new roadway at the end of the new 3rd Runway, and a new bridge was designed to cross Miller Creek near the eastern terminus at Des Moines Memorial Drive. A separate pedestrian/bicycle trail was designed on the north side of the roadway. Utility relocations included undergrounding overhead power lines. CTS’s responsibilities included illumination design, ROW surveying, and the preparation of ROW plans.