There are two routes from MRs house to CR 501, which is the road that goes around the lake. To get up Middle Mountain, the most obvious route is to take CR 501 across the north end of the lake and meet up with Middle Mountain Road at the northeast corner of the lake.
ETA: Dylan was found ~ 1/2 way up Middle Mountain Road. Also reported as ~ 6 miles up Middle Mountain Road. Also reported as ~10 miles up Middle Mountain Road from MRs house. All of those estimates are within an acceptable (IMO) range of each other. In other words, 10 miles from MRs house is ~ 6 miles up Middle Mountain Road.
Route 1 - CR 500 to CR 501 to Middle Mountain Road. It is 3.4 miles from MR's house to the intersection of CR 501 and Middle Mountain Road using this route
Route 2 - CR 500 to Trust Dr to Ponderosa Rd to W Vallecito Creek Rd to CR 501 to Middle Mountain Road. It is 3.2 miles from MR's house to the intersection of CR 501 and Middle Mountain Road using this route
It looks to me, on Google maps, that there are 5 houses facing CR 500 from MR's house to N Bridge Rd.
It looks like (it's difficult for me to see what is a driveway into a house vs a building on someone's property, sorry) like there's maybe 3 houses before you get to Boulder Lane.
Then just 2 houses along CR 500 between Boulder Lane and Mountain View Lane.
N Bridge Rd, Boulder Lane and Mountain View Lane are short roads, that end near the creek.
From MR's house:
It is 1.1 miles to the intersection of CR 500 and Trust Dr.
It is 2.3 miles to the intersection of CR 500 and CR 501
There is a store along CR 501 south of the 500/501 intersection
http://vallecitolakecountrymarket.com/index.htm This store is 2.8 miles from MRs house
That is really close to the Schank House restaurant that I see in the news as a place where folks are eating dinner.
Random notes. Hope they help!
https://maps.google.com/maps?saddr=...s-hzEZVyduhYZ64w&t=h&mra=mi&mrsp=1&sz=16&z=15