Morrison Bridge

Welcome to the Morrison Bridge. As we stand near the downtown western approach, we are preparing to analyze a bridge that embodies the raw, mechanical power of mid-twentieth-century civil engineering. …

Stepping onto the pedestrian pathway alongside the main lift span, let us direct our attention to the driving surface itself. The central bascule leaves of the Morrison Bridge historically featured an open steel grating. …

Let us peer over the railing toward the massive concrete piers in the river to analyze the physics of the bascule operation. The Morrison Bridge is a marvel of applied mechanics. …

As we examine the driving surface, it is impossible to discuss the Morrison Bridge without addressing the notoriously troubled history of its recent deck replacements. Maintaining a bascule bridge is an ongoing battle against…

Look upward toward the utilitarian structure perched high above the roadway: the bridge operator's tower. From this elevated vantage point, a municipal employee controls the complex choreography of river and road traffic. …

As we shift our focus from the mechanical to the aesthetic, observe the infrastructure mounted along the bridge's exterior edges. While the Morrison Bridge was designed primarily for raw utility, it has recently been integrated…

We conclude our analytical tour at the eastern approach, where the Morrison Bridge dissolves into a complex, multi-layered interchange connecting Interstate five, Interstate eighty-four, and the surface streets of the central…

Our scholarly examination of the Morrison Bridge has illuminated the complex, heavy machinery that drives Portland's urban core. We have analyzed the precise teeter-totter mechanics of its Chicago-style bascule span and the…