History Washington State Route 174
sr 174 had been parts of various county roads until 1937, when washington established system of primary , secondary highways throughout state. 1 of secondary highways, secondary state highway 10b (ssh 10b) ran primary state highway 10 (psh 10) in bridgeport coulee dam, near grand coulee dam built in 1942. secondary highway, secondary state highway 4c (ssh 4c) ran grand coulee psh 4 near wilbur. in 1951, western terminus ssh 10b moved bridgeport psh 10 in leahy , western portion psh 2 in farmer psh 10 in mansfield. branch of ssh 10b main route crown point viewing area of grand coulee dam added in 1955. sr 174 formed after 1964 renumbering of washington state highways, eliminating previous primary , secondary highway system. ssh 10b , ssh 4c connected become new highway , renumbering went effect in 1970. in 2009, second spur
in leahy established , added state highway system.
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