The Orange County Transportation Authority is scheduled to appear before the California Coastal Commission on Thursday, Nov. 5, seeking authorization for extensive shoreline armoring and beach replenishment along the beachfront railway in south San Clemente. As Orange County Register reported, OCTA is asking the commission to approve plans to retain 48,463 tons of existing riprap along the tracks, add 2,100 tons of new riprap, construct a 1,223-foot-long seawall on the ocean side of the rails, and install 220 tiebacks to stabilize the adjacent bluff.
The submittal addresses a vulnerable section of the 351-mile LOSSAN rail corridor, which carries passenger and freight rail between San Diego and San Luis Obispo. Repeated track damage along the San Clemente coastline has halted service between Orange County and San Diego multiple times in recent years. At high tide, ocean water hits directly against shoreline rocks and tracks in San Clemente, narrowing southern beach spans from 200 feet to under 80 feet in less than a decade.
To balance the structural interventions, the project includes placing 690,000 cubic yards of beach-compatible sand, representing the largest sand replenishment effort in San Clemente's history. The proposal designates 240,000 cubic yards of sand for placement north of the San Clemente Pier and 450,000 cubic yards at the city's southern end. Sand would be dredged from offshore sites or trucked from a stockpile at Prado Dam, with placement targeted to begin by next February.
In addition to specific construction components, OCTA requested a long-term maintenance program allowing riprap installation across all San Clemente beaches if sand replenishment proves insufficient. Coastal Commission staff noted in a report that OCTA failed to supply specific parameters for the program, including maximum riprap volumes. OCTA requested a 30-year permit duration to protect long-term planning funds, while commission staff recommended a 10-year term paired with specific conditions.
Staff recommendations include a 10-point mitigation framework, public access improvements, and a requirement for a long-term railroad adaptation study to be completed by Nov. 2030. The conditions also require removing unnecessary rock to restore beach access, along with a 10-year monitoring program to track sand movement and potential impacts on kelp and reef habitats.
OCTA Chair Jamey M. Federico stated in a letter to the commission that the authority has allocated roughly $100 million to the effort—representing nearly one-third of the total project budget—to restore a coastal trail link and fund the sand replenishment. The filing follows OCTA's recent completion of a nearly $93 million revetment project, which included a landslide mitigation wall and a new section of beach trail near the site of the former Mariposa Bridge.
Environmental advocacy groups and public agencies have filed formal objections to the application. Orange County Coastkeeper urged the commission to deny or amend the proposal, characterizing it as one of the largest potential encroachments ever reviewed under a single conditional use permit. Coastkeeper argued that staff findings lack estimates on how long the hard armoring will preserve the rail line and urged the commission to mandate active beach replacement rather than monitoring alone.
Advocacy group Save Our Beaches noted that while the current proposal reduces the seawall's size and scope, a vertical seawall could produce greater turbulence and scour than sloped revetments. The group urged commissioners to require a 15-foot offset from the tracks and to obligate OCTA to maintain an 80-foot sandy beach in front of all armoring for the duration of the permit. State Parks' Orange Coast District also submitted comments raising concerns over how shoreline armoring might impact San Clemente State Beach and public access to San Onofre State Beach.
