The first was built in 1927 as part of the Sunset Highway (later US 10), a precursor to I-90. In 1962 the second bridge was built because the reservoir pool backing up behind the new Wanapum Dam would soon overwhelm the old bridge; it was dedicated by the state on November 9, 1962.
The first bridge was constructed in 1927 as part of the Sunset Highway (later US 10), a precursor to I-90. Two years later, in 1962, a second bridge was built due to the reservoir behind the Wanapum Dam threatening to inundate the old one; it was officially opened by the state on November 9, 1962.