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Check the Arroyo Streamflow

These charts illustrate the historic streamflow and recent conditions in the Arroyo Seco.  The data, which have been recorded for more than one hundred years, comes from the US Geological Survey gauging station located in the the mountain reaches of the Arroyo above Jet Propulsion Laboratory and the mouth of the Arroyo.

Current

This chart illustrates streamflow during a recent week. Blue is current; gold is the 103 year median. For the current week, click on the chart.

Past Month

This chart illustrates streamflow during a recent month. Blue is current; gold is the 103 year median. For the current month, click on the chart.

Past Year

This chart illustrates streamflow during a recent twelve month period. Blue is current; gold is the 105 year median. For the past year in an expanded format, click on the chart.

Historic Maximum Steamflow

The chart above depicts the peak streamflow in the Arroyo Seco for each year from 1910 to this year.  As you can see, the flow varies widely from year to year, and floods are rare.

How To Read the Streamflow Charts

The charts on this page depict historic conditions.  You can view up-to-date, real-time conditions by clicking on the charts themselves or on links below.

Arroyo Seco Foundation, 570 W. Avenue 26 #450, Los Angeles, CA 90065
PO Box 91622, Pasadena, CA 91109-1622 (323) 405-7326 info@arroyoseco.org