Since 2007 the SFPUC has conducted fisheries monitoring in the
Hetch Hetchy Reach of the upper Tuolumne River. In 2014, the SFPUC asked Stillwater Sciences (in collaboration with McBain Associates) to take a fresh look at our existing approach and provide recommendations that would increase sampling efficiency and statistical robustness. Stillwater's recommendations included sampling shorter sites with an increased number of passes, thus providing a slight increase in efficiency, and over time, a more reliable statistical basis for understanding the relationship among environmental variables, O'Shaughnessy Dam releases, and trout populations. The recommendations and their implementation during our fall 2014 snorkel survey effort are described in
this report.
