This article explores the engineering behind the ULMA MK truss falsework used to cast the tower crossbeams of the stal̕əw̓asəm (Riverview) Bridge. Through detailed staged 3D analysis, the system’s strength, stability, and evolving load paths were verified under gravity, wind, concrete pressure, and construction sequencing.

Before the end span of the new Pattullo Bridge—now known as the stal̕əw̓asəm (Riverview) Bridge—could behave as a cable-stayed structure, it relied on a carefully engineered system of temporary bracing. This article explores how those short-lived elements provided critical stability during construction, then disappeared without a trace.

Temporary works must do more than carry load—they must manage settlement, seismic demand, and constructability under real-world constraints. Part B of this article explores how the TP3 temporary tower was engineered to mitigate settlement, redirect seismic forces, support construction sequencing, and then be removed without a trace.