somewhere near North Bend, WA on the west side of Snoqualmie Pass
http://forums.ghosttowns.com/showthread.php?13951-Anyone-heard-of-a-Weston-WA
Weston was located about 4-5 miles east of Lester on the Green River. It looks like that currently no roads head towards the area, only a single trail that veers away from the river. You may have to follow the river
You'd need to take NF 54 over Stampede Pass. The trail (NF 52) that follows the Green River leaves the road just before the Lester Airport, and immediately looks like it crosses Sunday Creek. Looks like the Weston site is probably just after the trail crosses Intake Creek.
Try Googling "U.S. Atlas 1895" and check King County. OJ
WESTON (King) ... no remains