SSH 3M was added to the state highway system in 1937. This route began at Jct PSH 3 (signed as US 97 before 1940, US 10/US 97 after) and headed south across the Yakima river, then southeasterly via Thorp. then easterly, ending at Jct PSH 3 (US 97) in Ellensburg. SSH 3M was dropped from the state highway system in 1953.
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