For Immediate ReleaseNovember 19, 2015
Travel plans could be affected, including on Thanksgiving
San Rafael, CA – High-tide flooding is expected in Marin County starting next week, and the County of Marin’s Department of Public Works and the Marin County Flood Control and Water Conservation District are teaming with the California Department of Transportation (Caltrans) to urge residents and visitors to stay informed of changing conditions and research how high tides might affect travel plans.
Drivers are encouraged to consider using alternative routes, avoid driving through ponded water, and allow extra time for trips, especially during peak times of holiday and commuter travel. Check 511.org for latest traffic and transit information. Note, Caltrans plans to close the lower half of the Manzanita Park and Ride Lot and all nearby Shoreline Highway street parking in the Tam Junction area starting Friday, November 20.
The accompanying chart includes predicted high tides at or above 6.5 feet Mean Lower Low Water (MLLW) through December 31 at the San Francisco gauge, as provided by the National Oceanic and Atmospheric Association. (KT = king tide)
Monday, November 23, 8:52 AM
Tuesday, November 24, 9:34 AM
Wednesday, November 25, 10:16 AM
Thursday, November 26, 10:59 AM
Friday, November 27, 11:42 AM
Monday, December 21, 7:38 AM (KT)
Tuesday, December 22, 8:25 AM (KT)
Wednesday, December 23, 9:11 AM (KT)
Thursday, December 24, 9:56 AM
Friday, December 25, 10:41 AM
Saturday, December 26, 11:24 AM
King tides occur when the earth is closest to the sun and when the moon’s orbit is closest to the earth, thereby causing a strong gravitational pull on surface water. Normal tides can still be significant even when king tide conditions are not present.
Marin has a number of known tidal flood-prone locations where tidal water impacts roadways.
During extreme high tide events, tidal flooding is also known to occur at the following locations:
The National Weather Service has advised that El Niño conditions are already present and are likely to continue through this winter. The latest precipitation outlook for December through March indicates that Marin has a greater than 40 percent chance of receiving above normal precipitation. El Niño may increase the frequency of nuisance flooding.
Flood control zone-specific updates regarding maintenance, storm preparedness and responses are provided at marinwatersheds.org. Learn about how you can prepare for flooding on the Flood Control District’s flood preparedness webpage.
Hannah LeeSenior Civil EngineerPublic Works
3501 Civic Center DriveSuite 304San Rafael, CA 94903(415) 473-2671Email: Hannah LeePublic Works website