The specimen taken last fall was in the east fork of the white not the main stem.
The East Fork is a pretty big river in the lower section (both forks are actually).
http://en.wikipedia....River_(Indiana)
Truf,
The segments you mention perhaps had historic records that were fringe parts of this population, or a dozen other hypotheses. Why they haven't placed those HUCs in the map is beyond me. Could be that those segments were listed because they're in a larger more inclusive HUC that had them... Could be that someone didn't feel like adding them to the map... Could be a lot of things.
Natureserve is good for ideas, but I wouldn't bet the farm on the data
Todd