April 24, 2019 09:13:00 am   The information on this website updates every 15 minutes — for current conditions, periodically refresh or relaunch this website.

This map is based upon the best available data from gauges, models and past events. Please monitor local conditions and take appropriate action.

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Enter your mobile number to receive a text when flood conditions change

Enter your e-mail address to receive a message when flood conditions change

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Background Data

Information presented on this website's Flood Map is based on data from stream gauges in the upper watershed west of Highway 280 and tide gauges in the Bay, as well as hydraulic models and experience with previous storm events. The public is invited to access the detailed information from these stream gauges and rainfall gauges by clicking on the link>, and inputting the following into the appropriate fields:

username: viewer
password: SanFrancisquito

About this website

This interactive website provides real-time information from new creek flow and rainfall gauges west of Highway 280 to help emergency responders and the general public make informed and timely decisions during storm events. This website is configured for computers, Android and iOS smartphones, and tablets. For the best experience, please use the latest version of your browser (Chrome 44, Firefox 39, Internet Explorer 11, Safari 7.1).

The website is designed to provide approximately two hours notice of when San Francisquito Creek will reach flood watch or flood warning stages at and near four flood-prone bridges: Highway 101, University Avenue, Pope-Chaucer Streets, and Middlefield Road.

Under normal conditions, these bridges are shown as green circles on a searchable Flood Map (see tab above) on this website’s homepage. During a major storm, if creek flow gauges far upstream of these bridges indicate that the flow will reach 60% capacity at any of the bridges, the circle for that bridge will change from green to yellow and the neighborhoods most at risk will also be shown in yellow. If the creek flow upstream indicates that flooding is expected to occur at any of the four bridges, that bridge and the corresponding neighborhoods will turn red. Please do NOT call 9-1-1 unless there is an imminent threat to life or property.

To receive alerts by text or e-mail when creek conditions change anywhere to "flood watch" or "flood warning" or back to "all clear" use the Receive Alerts tab above to provide your mobile phone number and/or e-mail address. We will not share the information you provide with any other party.

You can also report a non-life threatening flood-related problem via this website using the Report a Problem tab above. Using the boxes in that tab, please provide your contact information and a description of the problem, and you can upload a picture of the problem from your phone, tablet or computer. What you send will be seen, but you may not receive a response.

The color-coded flood threat level is determined by a combination of factors, including current water in the creek at several locations, current and expected rainfall, and experience with previous major storms. The current creek flow and rainfall data for this website can be found on the Background Data tab above, and simultaneous data can be seen at the long-standing Palo Alto Creek Monitor Website, which is also included as a tab above.

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