Klineline Bridge, also known as Salmon Creek Bridge, on Highway 99 is not what it used to be when originally constructed in 1928. The bridge has a history of requiring extensive repairs after flooding events. This includes rebuilding the bridge after a partial collapse in the mid 50s. Portions of the structure are 80 years old.
Highway 99 was originally the primary north-south route for inland vehicle travel from Seattle to Southern California. Interstate 5 ultimately replaced this route in the 1960s. Washington Department of Transportation transferred the highway and the bridge to county control in the 1970s. The WSDOT transfer included transfer of the official bridge name “Bridge #1 – Klineline”.
