|Data Average Method||
Annual Average, 5-Year Average, Trend
Program Water Clarity
Measurements are taken in Lake Tahoe using a 25 centimeter, all white Secchi disk. The disk is lowered into the water column from a boat to a depth at which it is no longer visible by the observer, and then raised slowly until visible again. The midpoint of these two depths is called the Secchi depth. Between 18 and 37 individual Secchi depth measurements have been collected each year at an established index station.
To download all of the water clarity data on this page please see Tahoe Open Data.
Associated Programs data not provided.
Average Secchi Disk Transparency is reported in Lake Clarity Tracker. Indicators in the Lake Clarity Tracker are used to demonstrate compliance with TMDL requirements.
Average Secchi Disk Transparency is reported in the Sustainability Dashboard. Indicators in the Sustainability Dashboard focus on economic, environmental, and community health in the Lake Tahoe Region.
This indicator measures the annual average secchi depth in Lake Tahoe. The secchi disk depth is the standard gauge of Lake Tahoe's deep water clarity and has been used as a consistent measure since the 1960s.
Average Secchi Disk Transparency is include in the Threshold Dashboard. Threshold Indicators are evaluated against Threshold Standards every 4 years. Thresholds are environmental goals and standards for the Lake Tahoe Basin that indirectly define the capacity of the Region to accommodate additional land development.