What is the California King Tides Project?
Scientists need you to be their eyes on the ocean between January 10–12 and February 8–9, 2020. On these dates, the California coast will experience the highest tides of the year, commonly called King Tides. These extreme tides often encroach on infrastructure, submerging coastal access stairways, swallowing beach-side trails, overwhelming boardwalks, surging into storm-drains, and flooding roads. They can also inundate coastal habitats that aren’t typically submerged, like higher marsh areas or even dune scrub.
With the rate of sea level rise increasing worldwide, what we consider ultra-high tides today may be what we experience every day in 2050 or 2100.
A recent King Tide rose to the top of the pilings beneath Rose’s restaurant (left) and brought floating docks close to their maximum height (right) along Morro Bay’s Embarcadero.
California King Tides Project photos inform scientists and policy makers
The California King Tides Project depends on community members to head out to the coast during King Tide events, take photographs of infrastructure and wild lands when the tides are at their highest, and upload them to the King Tides Project’s database. These photographs are added to the project map for everyone to see, and the data they contain helps researchers and policy makers evaluate potential impacts to California’s coastline as the sea level continues to rise.
Participate in the California King Tides Project
Step 1: take pictures at high tide
It is easy to participate. Just pick one of the days below, find a safe place to view the tides, and snap a picture during the morning high tide.
| Date | High Tide | Height | Low Tide | Height |
| January 10, 2020 | 9:07 AM | 6.49 ft | 4:35 PM | -1.35 ft |
| January 11, 2020 | 9:49 AM | 6.52 ft | 5:16 PM | -1.42 ft |
| January 12, 2020 | 10:25 AM | 6.37 ft | 5:58 PM | -1.31 ft |
| February 8, 2020 | 8:56 AM | 6.49 ft | 4:12 PM | -1.41 ft |
| February 9, 2020 | 9:42 AM | 6.50 ft | 4:51 PM | -1.38 ft |
The extreme high tides are mirrored by extreme low tides during these times. If you’d like to see the contrast between the two, try visiting the same spot at high and low tides on the same day. You’ll be amazed at the difference. We’ve listed both the high and low tides in the table, though the King Tides Project collects photographs only of the high tide impacts.
Step 2: upload your pictures
This is the most important part! Please take the time to download the free Survey123 app and upload your photographs to the California King Tides Project.
Click here to visit the California King Tides Project’s website for detailed instructions on downloading the app and using it when you have phone service or when you’re out of the service area.
You can also download PDF instructions for using the app, complete with screenshots, here.
What causes King Tides
These exceptionally high tides occur each winter when:
- Earth is at its closest to the sun (i.e. at perihelion),
- the moon is at its closest to the earth (i.e. at perigee), and
- all three bodies are aligned, producing either a full or new moon.
Because these tides occur when the moon is at perigee, the more technical name for them is perigean-spring tides. The infographic below, from NOAA Ocean Service, illustrates the conditions that combine to create these extra-high tides.
In this position, the sun exerts an extra gravitational pull that causes the ocean bulge to increase further. Watch the video below to see this process in action.
To learn more about tidal cycles and why they exist, visit NOAA.
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