Vancouver-Portland Interstate Bridge, Interstate Route 5 Spanning Columbia River, Vancouver, Clark County, WA
Significance: The original 1917 bridge represented an enormous financial and engineering accomplishment, shared by the counties of two states. It was designed by the renowned engineering firm Waddell & Harrington, leaders in the field of vertical lift bridge design in the twentieth century. The 1958 bridge was built as a twin structure to the original. The piers of this bridge were assembled from hollow precast segments, a (then) recently patented technique.
Unprocessed Field note material exists for this structure: N142
Survey number: HAER WA-86
Building/structure dates: 1916 Initial Construction