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Pacific Southwest Research Station
Tahoe Science Projects supported by SNPLMA
Development of status and trend indicators for stream condition and other resources
Final Report [pdf]
Please contact Dr. Andrew Stubblefield with questions regarding the reports and data files presented below.
Trend analysis of a sub‐set of sites revealed no significant differences between the 12 sites sampled in 2003 and nearby sites sampled in 2009‐2010. Precipitation and discharge were near average for the years examined, so climate was not likely to have exerted a bias on this assessment of the status and trends of aquatic resources for these years. There was no apparent relationship between biological condition and the percentage of impervious surface in the upstream watershed; this may be a result of overall low levels of impervious surfaces basin‐wide.
An investigation of habitat variables with biological condition found that Marginal sites tended to have higher water temperatures, more glide and pool habitat, larger coverage of non‐woody vegetation and more fine sediment. Habitat variables associated with better biological condition included more riffle habitat, boulders, higher slope and dissolved oxygen. Specific Marginal sites seemed to have common sources of degradation including lower stream flow discharge, more bank erosion and more sand and fine streambed substrate.
The stream evaluation methods presented in this study are meant to serve as a model for future assessment of streams in the Lake Tahoe Basin.
Data sets that accompany the drinking water quality analysis:
Data sets that accompany the indicator summary reports:
|Last Modified: Nov 26, 2014 05:21:39 PM|