Snapshot Day

Connecting the Tahoe community to its watershed

Snapshot Day is a citizen science water quality monitoring event that takes place each May. Volunteers fan out across the Truckee River Watershed to take samples from creeks, streams and lakes – including Lake Tahoe – to capture a snapshot of Tahoe’s water quality at a moment in time.


What do volunteers monitor at Snapshot Day?

The information gathered by volunteers is compiled into long-term data sets on water quality conditions within the Truckee River watershed. Snapshot Day also provides baseline data that can be used in ongoing and future environmental projects.

If you are interested in viewing data and analyses from previous Snapshot Day events, please visit You can also contact us at for more information about Snapshot Day and to learn how you can get involved.