New tidal creek gauge in Larkspur

Posted on January 12, 2024

Good news, the Marin County Flood Control District has put a new device on the Bon Air Road Bridge in Larkspur! Check out this map for specific location.

The device is a special measuring tool that tells staff how high or low the water is in Corte Madera Creek, right under the bridge. You can check out the info in (almost) real-time, along with data from other places in the Ross Valley Watershed. 

Using the website, you can see a graph for the water level at Bon Air Road Bridge.  The water levels in the creek change even if it’s not raining, since the creek is influenced by tides from the bay and river flow conditions. Because of those various factors, flooding can happen when it’s not raining, which is another reason it important to monitor creek levels with these types of devices, allowing for early warning flood alerts.

It is crucial to remember that if you see a flooded street, don’t try to cross it, whether you’re in a car, on a bike, or walking. Stay safe and find an alternative route! For more info before or during a flood, you can check out the Marin County Emergency website. 



The District makes no representation or warranty, express or implied, with respect to data accuracy, completeness, timeliness, reliability, quality, or usefulness. Data are provided “as-is” and should not be relied upon for making critical decisions. The District assumes no liability for any damage to or loss of property, or personal injury or loss of life, which may arise out of use of data. 


Please email to FloodInquiry with any questions about the new water level gauge. 

Close window