It really puzzles me why these two signs are on the Middle Fork Road because it is open for 12.5 miles (to the Taylor River Trail, the road to Dingford is gated). Here is my theory:
Yellow Sign: This is the county and is referring to the upper road that is washed out. The lower road is actually the Lake Dorothy Road.
White Sign: The distance refers to the distance to the gate at the USFS boundary that was put there when they were doing work on the Taylor River bridge (that gate is most definitely open). My guess is that this sign was put up by DNR (they own the land at Mailbox Peak) and either just haven't taken it down or would like to think the road is closed (so that all of Washington will only use the Mt. Si trail).