Wasn't the first name of their postmaster's daughter was it?.. ;-)
Ada would have originally been served by mail boat, probably from Westlake, and probably never had more than one or two families living there before the road went in (which became year round passable only within my lifetime). The West and North shores of the lake have been inhabited for a long time but Ada is the one inhabited place on the East shore. The South and East shores of Siltcoos are still not frequented by a lot of human traffic.
That is a function of the geography of the area, much of the south & east is landlocked by private timberland and even a plot my family used to have on the south shore was abandoned because the access fee was too high (at the time, I think $150 a year to use the dirt road).
That, plus the trailer tipped over.