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On its web site, the Washington State Department of Transportation (WSDOT) described the bridge and its reasons for replacing it. "The Manette Bridge was originally built in 1930. The bridge was constructed with five steel truss main spans on six concrete piers, elements still part of today’s bridge. A 1949 contract replaced the original wooden deck and timber trusses in the outer spans with concrete and steel. The primary areas of structural deficiencies are in the concrete piers and the structural steel trusses. Most of these elements were built in 1930. The concrete in the foundations is in varying states of deterioration. Testing and analysis of concrete taken from the main piers from 1976 thru 2003 determined that deterioration in the concrete has resulted from a process called Alkali Silica Reaction (ASR)." The WSDOT site went on to describe ASR: "ASR causes deterioration of mortars and concretes due to the swelling of gel formed by the reaction of alkali in cement-based materials with reactive silica in aggregates, in the presence of water. The swelling of the gel generates tensile stresses in the specimen resulting in expansion and cracks. There is no known way to mitigate and fully address the ASR problem in the concrete foundations of the six piers supporting the steel truss spans." (See "Manette Bridge,"Accessed 11/10/2011.)

The Manette Bridge was originally built in 1930. The bridge was constructed with five steel truss main spans on six concrete piers, elements still part of today’s bridge. A 1949 contract replaced the original wooden deck and timber trusses in the outer spans with concrete and steel. The primary areas of structural deficiencies are in the concrete piers and the structural steel trusses. Most of these elements were built in 1930. The concrete in the foundations is in varying states of deterioration. Testing and analysis of concrete taken from the main piers from 1976 thru 2003 determined that deterioration in the concrete has resulted from a process called Alkali Silica Reaction (ASR).

Demolished; the bridge was removed between 11/2011-02/2012.

PCAD id: 17230