Stream Habitat Condition
Stream Habitat Condition
Intermediate Result
Mile (miles)
F1-F3: As indicated by the Stream Habitat GIS data, amended May 1997, based upon the re-rated stream scores set forth in Appendix C-1, of the 1996 Evaluation Report, maintain: F1) 75 miles of excellent stream habitat, F2) 105 miles of good stream habitat, F3) 38 miles of marginal stream habitat.
This Indicator is reported in the following LT Info areas:

Average California Stream Condition Index (CSCI) scores of all trend sites for each time period. Site scores are put into three different categories of excellent (CSCI >0.92), good (CSCI = 0.79-0.92), or marginal (CSCI <0.79). The California Stream Condition Index (CSCI) measures the biological health of streams by assessing the community of benthic macroinvertebrate in perennial streams.

No Subcategories for this Indicator.

Program Streams


TRPA's stream monitoring program uses the Surface Water Ambient Monitoring Program bioassessment protocol, which measures Benthic Macroinvertebrate (BMI) composition and physical stream habitat to assess overall stream health. BMI composition and habitat is compared against pristine streams using the California Stream Condition Index to determine the biotic integrity of streams. Probabilistic and targeted sampling is used to assess the overall health of Tahoe streams, changes in stream health over time, and to assess large scale restoration and BMP implementation projects. 20 probabilistic, one-time "status" sites are sampled per year, as well as 73 "trend" sites re-visited every four years. Only trend sites are displayed on this page. Status site information can be found at

To download all of the stream data on this page please see Tahoe Open Data.


Associated Programs data not provided.