Primary State Highway 18 (Washington)
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| Primary State Highway 18 |
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| Existed: | 1937 – 1964 | ||||||||||||
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| West end: |  PSH 7 near Bruke/George |
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| East end: |  PSH 11 in Ritzville |
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Primary State Highway 18, was a highway in the state of Washington, U.S.A., from 1937 to 1964. PSH 18's route extended from George in the west, to Ritzville in the east.
In the 1940's US 10 was cosigned with the highway. Later in the 1960's I-90 took the designation and eventually wiped away PSH 18.
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[edit] Branches
PSH 18 had only two unnamed branches.
[edit] Unnamed branch 1
PSH 18¹ started at PSH 18 in Ritzville and went east to PSH 3 in Steptoe. It was created in 1943 and was never fully completed from PSH 18 to SSH 11C near Ewan. It became the never-finished SR 230 and the completed section became part of SR 23 in 1964.
[edit] Unnamed branch 2
PSH 18² started at PSH 18¹ in Ewan and went to Primary State Highway 11 in Sprague. It became part of SR 23 in 1964.
[edit] Secondary State Highways
PSH 18 had no secondary branches.
