For the first time, a collaborative study [http://iopscience.iop.org/1748-9326/8/1/014039] has compared water quality trends in forested streams across the country that are largely undisturbed by land use or land cover changes. The study draws on 559 years of stream nitrate and 523 years of stream ammonium data from 22 streams in 7 experimental forests across the country. The study found that even near-pristine forested streams are subject to change.
The Kings River Experimental Watersheds hosts the Southern Sierra Critical Zone Observatory--a National Science Foundation effort to gain a better understanding of the zone of earth where "rock meets life." The critical zone extends from the tops of the trees to the groundwater and covers the entire earth where there is land. Dowload the video created by a UA Flandrau Science Center team to introduce the motivation and science involved in the National Critical Zone Observatory research program.
Kings River Experimental Watersheds (KREW)
The use of stream invertebrates for evaluating ecosystem health (bioassessment) has become a popular method to determine habitat conditions and water quality of streams and rivers. For specifics concerning stream invertebrates see the KREW Study Plan (Hunsaker et al.)