The two-lane highway travels southeast as Willow Grove Connection Road and Industrial Way around Mount Solo and into the city of Longview.

[3] The SR 432 designation travels onto four-lane Tennant Way grade-separated highway and continues southeast, parallel to a BNSF rail yard, before intersecting Dike Road in a partial cloverleaf interchange and crossing over the Cowlitz River into Kelso.

[5] The partial cloverleaf interchange, nicknamed the Longview Wye,[6] serves as the eastern terminus of SR 432 while the roadway continues south as the Old Pacific Highway.

[28] The eastern terminus of SR 432, an interchange with I-5 nicknamed the Longview Wye,[6] was reconstructed by WSDOT beginning in December 2009.

[29][30] WSDOT removed the northwest loop ramp, which connected Old Pacific Highway to southbound I-5,[31] and replaced it with an improved interchange with Talley Way that opened on October 28, 2011.