A state highway to be known as state route number 174 is established as follows:
Beginning at a junction with state route number 17 east of Bridgeport, thence easterly to the boundary of the federal reservation at Grand Coulee dam; also
Beginning at a junction with state route number 155 at Grand Coulee, thence southeasterly to a junction with state route number 21 in the vicinity north of Wilbur; also
A spur beginning at a junction with state route number 174 in the vicinity of the boundary of the federal reservation at the Grand Coulee dam and extending to Crown Point.