Washington State Route 407 (Wash.)

found: Work cat.: Washington (State). Dept. of Highways. An extension, State Route 407 to State Route 506, Elochoman River to Ryderwood, Wahkiakum, Cowlitz and Lewis Counties, 1972.

found: Highways of Washington State web site, Feb. 2, 2006:State Route 407 (When the current state highway numbering system was first posted in January 1964, SR 407 started at Jct US 830 NW of Cathlamet and followed the Elochoman River into the Willapa Hills, where SR 407 ended. US 830 in the area became SR 4 in 1968. Effective April 1, 1992, SR 407 was dropped from the state highway system. Before 1964, SR 407 had been SSH 12D) Secondary State Highway 12D (SSH 12D was added to the state highway system in 1937. This route began at Jct PSH 12 (at the time US 830, now SR 4) near Cathlamet and headed upstream along the Elochoman River to the vicinity of its confluence with the West Fork of the Elochoman River. When the current state highway numbering system was first posted in January 1964, SSH 12D became SR 407)

notfound: GNIS, Feb. 2, 2006;Washington State highways website, Feb. 2, 2006;Wikipedia, Feb. 2, 2006