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More Groaning Over Groins: Neighboring Cities OPPOSE Oceanside Groin Project

Surfrider has opposed Oceanside's groin project proposal since its inception in 2019, instead urging the City to embark on more regional solutions to put sand back on their beaches. On August 19, 2021, the Oceanside City Council approved a pilot groin project with a 4-1 vote, the lone dissent being from Mayor Esther Sanchez. Since then, three cities south of Oceanside have passed resolutions opposing the groin project. 

Surfrider opposes groins for several reasons. If this is all new to you, please refer to this abridged version of our original groin blog post. In it, we provide a comprehensive background on Oceanside’s sand issues and expand upon the unintended consequences of constructing groins as a sand retention device. 

By trapping sand at one beach, groins effectively steal sand from the next beaches over. In North County, where sand typically moves from north to south, trapping sand in Oceanside will directly impact sand supply to neighboring beaches to the south, from South Oceanside all the way to Del Mar. Adding insult to injury, Oceanside did not consult with their southern neighbors prior to approving a pilot groin project in August 2021. 

It was only a matter of time until potentially affected cities spoke up. On January 11, the Carlsbad City Council unanimously approved a resolution to oppose Oceanside’s pilot project to construct four groins.  From The Coast News:

This irony did not sit well with Carlsbad Councilman Peder Norby, who blasted the Oceanside City Council for passing the action item in August without first consulting with Carlsbad officials. “I can see this ripple effect all the way down the coast,” Norby said. “It’s a really, really amateur move. I’ll go on record asking the City of Oceanside to rescind that item.”

On February 22, Del Mar joined Carlsbad in officially opposing Oceanside’s pilot groin project. Solana Beach passed a similar resolution the following day.  You can read all three of the city’s resolutions below. All are similar and address the same concern: blanket opposition to the construction of devices that could interfere with the natural flow of beach sand into their beaches. 

Surfrider supports the resolutions passed by Carlsbad, Solana Beach, and Del Mar. However, we empathize with the plight of Oceanside’s beaches and wish these resolutions had not been necessary in the first place. Sand is a regional issue, and needs to be addressed as such. Our hope is that Oceanside drops the “go it alone” approach as it only pits north county cities against each other. The only sustainable way for Oceanside to save its beaches is to work with all regional stakeholders. One example: a sand bypass system around Oceanside Harbor and the Del Mar Boat Basin without groins, if done correctly, would benefit Oceanside's beaches as well as those of its southern neighbors. 

Each city's resolution can be read in full below, along with its accompanying agenda item packet.

Groaning Over Groins: Our Position on Sand Retention Strategies in Oceanside

*originally published June 29, 2021

Surfrider does not support groins, and we've put together some background information on this locally charged issue for those who want to speak up and support their local Oceanside beaches.

How Oceanside’s beaches disappeared

Before we get into the merits or pitfalls of groins, let’s get some context:

  • Oceanside Harbor and the Del Mar Boat Basin were built by the federal government in 1963 and 1942 respectively. They have contributed to significant sand loss in Oceanside by interrupting the natural north-to-south flow of sand in this area, as illustrated by the related breakwater jutting out from the coast in this blog's banner image (State of the Coast Report: San Diego Region, Volume 1, page 6-10).
  • Regardless of the impact of the harbor and boat basin, coastal development in Oceanside was built too close to the water for beaches to thrive under regular storm conditions or sea levels that have incrementally risen over the last hundred years. Marine erosion of beaches was "locally severe" in 1929, 1940, and 1941 before the boat basin and harbor were constructed. Properties at Saint Malo were severely damaged in the storm season of 1940-1941. More recently, storms in the early 80's caused significant storm damage to many waterfront properties including the Strand (Coastal Cliff Sediments, San Diego Region, page 5-122).
  • San Diego’s beaches have been eroding for thousands of years. Only in the last century have people started setting a back to the beach by developing property on naturally shifting coastlines, and then further protecting development in place with concrete seawalls and strings of large boulders called ‘rip rap.’ These flood protection devices change the way waves refract back to sea, which causes erosion and contributes to the narrowing of Oceanside’s beaches.
  • Oceanside’s complex coastal topography and engineered coastline means that specific areas are naturally susceptible to periodic sand changes caused by storm activity. The City has been ‘opportunistically’ placing sand on certain beaches since 1963 (Sea Cliffs, Beaches and Coastal Valleys of San Diego County, page 56).
  • Observed changes in sand dynamics are a result of natural processes but also of the impact or absence of sand placement projects.

Oceanside’s beaches are narrowing overall due to a combination of factors, including the fact that the City’s coastal boundary has been sited in an unsafe area. Surfrider does not believe that efforts to engineer a tidal equilibrium to suit this development pattern benefits the majority of public beach users or the public beach.

The Strand in 1979 and 1980 after storms. Sea Cliffs, Beaches and Coastal Valleys of San Diego County, page 58

Our position on groins as a sand retention strategy

Let’s get out with it — Surfrider is not for groins in Oceanside. We want to enjoy beaches south of the Oceanside pier as much as anyone else. However, groins are an engineering strategy of days past that have been widely criticized for their crude impacts to waves and regional beach management. Even the United States Army Corps, the builder-of-things on the coast, describes groins in its Coastal Engineering Manual as “probably the most misused and improperly designed of all coastal structures (Coastal Engineering Manual, V-3-59)."

Groins are long ‘fingers’ of concrete that stretch perpendicular to the coast, which build up sand by blocking its path. Groins do not create sand, they stop sand. In this stretch of coastline, where sand generally moves north to south along the shoreline from San Clemente through Del Mar, this means that sand unnaturally trapped in Oceanside is sand robbed from cities farther south. It is unlikely that the City can offset the ongoing negative impacts of downcoast erosion through artificial beach nourishment. Putting sand on beaches is becoming exponentially more difficult and expensive for all cities as sea levels rise and demand for sand increases.

Unfortunately, one groin in Oceanside will almost certainly beget the need for more groins in Oceanside as well as more of the structures further South. The California Coastal Commission, the quasi-judicial state agency that balances coastal access with private property rights, hasn’t permitted a new groin in California since 1998 because of their extensive impacts on downcoast erosion and on coastal resources. As a 2019 San Diego Union Tribune article puts it, “The Coastal Commission generally frowns upon seawalls, revetments and groins. Numerous studies have shown the structures can contribute to erosion and cause more problems than they solve.” Cue our next big problem with this strategy: Groins destroy waves. 

Yes - groins may also create waves that peel off the structure itself, but by interrupting sand dynamics so intensely (that is literally what groins are designed to do), groins have unknown impacts to pre-existing waves. Groins have been known to destroy beach breaks, which rely on particular sand arrangements on the ocean floor. 

Oceanside is avoiding the cause of its sand problem

At Surfrider San Diego, we are not willing to sacrifice the region’s awesome natural waves just because the City cannot move past a ‘build-something-to-fix-it’ paradigm. It’s because of this ideological roadblock that the Sand Retention and Feasibility Study being presented this week was directed to focus only on multi-million dollar options for engineering sand onto the beach.

The beach replenishment option that the City continues to avoid is comprehensive long-term planning for relocating assets from the coastline so that beaches can naturally move landward and coastal development is not repeatedly threatened. Most recently, Oceanside’s City Manager demonstrated the City’s overall position on relocation in a Voice of San Diego article, stating that “managed retreat isn’t something that will have to be implemented for at least another 20 years.” 

That’s certainly true if you want your response to an impending disaster to be the decade after it hits. With flooding days expected to drastically increase in 2030, Surfrider and other organizations continue to remind San Diego’s local governments that the next ten years represents the only time period that cities can initiate any proactive planning for drastic sea level rise.  

Global coastal flooding days caused largely by sea level rise and storm surge will increase drastically around 2030.  Oppenheimer et al, 2030.

Other city decisions seem to point towards a preference for development over preservation of the public beach. Most recently, Surfrider called the City of Oceanside out for making it easier for homeowners to maintain private perched beaches behind riprap revetments that should become public lands as sea levels rise. (In California, everything seaward of the mean high tide line is legally public land, and the public's beach should therefore be migrating inward as seas get higher.) The California Coastal Commission invoked a formal dispute resolution process in March in order to investigate this decision.

We need long-term planning to restore sand and beaches to Oceanside

Surfrider recognizes the need for sand restoration options in Oceanside. We believe this starts with responsible, long-term planning that benefits the majority of residents along with public beach users. In the short-term, we understand that artificial beach nourishment solutions will continue to be relied upon, and we support community requests to hire a dedicated planning position for managing the coastal zone.

For inquiries about our position, email us at