SSH 9C was added to the state highway system in 1937. This route began at Jct PSH 9 (US 101) north of Hoquiam and headed northwesterly via Copalis Crossing to Pacific Beach, then southerly to Copalis Beach, then easterly, ending at a junction with itself at Copalis Crossing.
In 1947 the route was changed significantly, now beginning at Jct PSH 9 (US 101) in Hoquiam and heading northwesterly to Ocean City, then northerly via Copalis Beach, Pacific Beach, and Moclips to the southern boundary of the Quinault Indian Reservation.
1951 legislation extended SSH 9C northerly through the reservation to Jct PSH 9 (US 101) at Queets. SSH 9C utilized an existing road as far as Taholah. The remainder of SSH 9A was a proposed road through the 1950s. In the 1960s, the state graded an extension of SSH 9A from Taholah to Queets and built several bridges along the route. When the current state highway numbering system was first posted in 1964, SSH 9C became signed as SR 109.
At some point, the state and Quinault Tribe came to a disagreement about the highway extension from Taholah to Queets. As of 2001, former SSH 9C, now SR 109, has never opened to the public as a state highway from Taholah to Jct US 101 at Queets.
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