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Thurston County
PSAP - Black River Bridge [Map] Pratt through truss bridge over Black River on Puget Sound and Pacific RailroadOpen to trafficBuilt 1919 using a secondhand span
Swantown Slough Bridge (Old [Map] Lost Concrete pony/through girder bridge over Swantown Slough on Fourth AvenueNo longer existsBuilt 1869 ; replaced 1922