Paul Henry's Archived Site (http://web.archive.org/web/20060718213705/phenry.org/wsh/)
Highways of Washington State by Mark Bozanich (http://www.angelfire.com/wa2/hwysofwastate/)
One more...
Highways in Washington State by Vanunu (http://home.earthlink.net/~duyzend/)
More!
MORE (http://web.archive.org/web/20050901164425/phenry.org/wsh/links.html)
I hate to pimp my own site but http://www.washingtonhighways.org (http://www.washingtonhighways.org)