Miles of Stream Habitat in Marginal Condition
Marginal Stream Habitat
Intermediate Result
Mile (miles)
Miles of stream habitat in different condition classes (marginal)
Miles of stream habitat in different condition classes (marginal)
This Indicator is reported in the following LT Info areas:
Stream Condition jpeg.JPG
Proportion of streams assessed in each condition in the Tahoe Basin based on California Stream Condition Index scores 2009-2014 (status sites only). Threshold standards for stream condition are the dotted lines. There were more excellent streams than the standard, but fewer good streams and too many marginal streams. Source: TRPA.

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.