It also appears that MR's home was north of the town and Lake Vallecito. Since Vallecito is fairly small, I would guess that most people would drive to work in Bayfield or Durango and would take either County Road 501 (to Bayfield) or County Rd 240 (to Durango). Regardless of where they worked, if coming from Vallecito, they would travel down CR500 to meet up with 501 or 240. If Dylan was walking, SOMEONE would have seen him at some point. JMO