Reservoir conditions, precipitation indexes, snow charts, drought maps and more …



Reservoir Conditions

Go here for an interactive map of the major reservoirs in the state. Click on a reservoir name to see storage graphs for individual reservoirs.  (Click here for non-interactive version.)

Reservoir Conditions – Top of Conservation Conditions (Statewide)

This variation of the standard DWR reservoir webpage shows the amount of storage available for flood control.

Reservoirs – Interactive

This page allows you to select individual reservoirs and view graphs of current versus historical and average conditions.  This page has information on more reservoirs than the graphs listed above.

For even more on reservoir conditions …

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Northern Sierra Precipitation: Eight Station IndexItem_9_Panel_1_Leahigh_Presentation_Page_04

Click on the image to view a graph of the Northern Sierra 8-station index.

San Joaquin Precipitation: Five Station Index

Check out a graph of the San Joaquin 5-station index here.

Tulare Six StationTulare Basin Precipitation: Six Station Index

Check out the newest index, the Tulare Basin Six Station index here.

Rainfall Maps

You can see a rainfall map for the last hour, six hours, 24 hours, or more at this webpage. Look at it statewide or by region.


For even more on precipitation …

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Snow Water Content graph

View a snow water content graph for the water year for each of the three zones in the Sierras.

Snow Water Content map

Get a simple map of current snow water content levels of the three zones in the Sierras here.

Sierra Nevada snow maps

You can find just about anything else you want to know about the snowpack – like temperature, snowmelt, sublimation and more – at the National Weather Service’s Snow Analysis page.

For even more on snow conditions:

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Radar NWSRadar

Check out the radar from the National Weather Service.

National Doppler Radar Sites

Access Doppler radars from locations throughout California and the West.


Multiple satellite views for the West Coast.

CNRFCCalifornia-Nevada River Forecast Center

River, snow, precipitation, temperature, freezing levels, water temperature and more is available at the National Weather Service’s California-Nevada River Forecast Center.

National Weather Service graphical forecasts for the Western US

View maximum temperature, minimum temperature, dew point, wind speeds, precipitation and more.

For more on weather conditions …

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California climate archiveCalifornia Climate Data Archive

Get long term precipitation and temperature data and more at this climate montioring and data access website sponsored by the California Energy Commission, the Scripps Institute of Oceanography and the Western Regional Climate Center.

West Wide Drought Tracker

View precipitation data for Western states.

Drought Monitor

The U. S. Drought Monitor is published every Thursday.  Click on the image to view the latest map.

Quick Drought Response Index (QuickDRI)

The Quick Drought Response Index (QuickDRI) is a shorter-term indicator of dryness.  QuickDRI is designed to provide a snapshot of anomalously dry or wet conditions over the past 4 weeks and serves as an indicator of emerging or rapidly changing drought conditions.

Groundwater and Soil Moisture Conditions from GRACE-FO

Groundwater and soil moisture drought indicators are generated weekly based on terrestrial water storage observations derived from GRACE-FO satellite data and integrated with other observations, using a sophisticated numerical model of land surface water and energy processes.

Vegetation Drought Response Index (Vegi-DRI)

Produced every two weeks, the maps provide regional to sub-county scale information about drought’s effects on vegetation, integrating satellite-based observations of vegetation conditions, climate data, and other biophysical information such as land cover/land use type, soil characteristics, and ecological setting.

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National Weather Service: 30-day forecasts

30-day forecast for temperature and precipitation.

Water supply forecast charts

Tool from the Natural Resources Conservation Service to forecast water supply by river basin.

Wildfire Risk Maps

See the wildfire outlook for the current month, the month following and a seasonal look at the two months beyond that.


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This page updated 4/2/2020.

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