Now I see that Sites 1 and 2 are further downstream, not upstream,
as I had assumed. In both areas, your data indicates the creek’s
temperature and pH have returned to normal levels for a mountain stream.
Yes, and once the creek passes beyond the influence of hydrothermal activity,
the EPT species represent a fairly large percentage of the total macroinvertebrates.
This is a sign that the water quality in Sites 1 and 2 is good. Obsidian
Creek certainly reflects Yellowstone in its natural state—and so
does the Firehole River!