Wash. Rev. Code § 47.17.503
A state highway to be known as state route number 278 is established as follows: Beginning at a junction with state route number 27 in Rockford, thence easterly and southerly to the Washington-Idaho boundary.
[ 1991 c 342 s 26.]
Effective dates—1991 c 342: See note following RCW 47.01.425.