Wash. Rev. Code § 47.17.240
A state highway to be known as state route number 125 is established as follows: Beginning at the Washington-Oregon boundary line south of Walla Walla, thence northerly to a junction with state route number 12 at Walla Walla; also From a junction with state route number 12 at Walla Walla, thence northerly to a junction with state route number 124 at Prescott.
[ 1979 ex.s. c 33 s 5; 1970 ex.s. c 51 s 49.]