Oceanside details "ReBeach" pilot — 900,000 cubic yards of sand and artificial reef; Carlsbad seeks regular technical briefings

Oceanside coastal staff updated the Carlsbad Beach Preservation Commission on the city of Oceanside's ReBeach sand nourishment and retention pilot, describing a plan that pairs roughly 900,000 cubic yards of beach fill with engineered sand-retention structures — a nearshore artificial reef and back‑beach headlands — and asking for improved cross‑jurisdictional coordination with Carlsbad.

The presentation matters because the two cities share a littoral cell: changes to where and how sand is placed and retained in Oceanside could alter sediment transport and therefore affect beach width and recreation, shoreline protection and dredging needs in Carlsbad. Commissioners pressed Oceanside staff for technical detail, clarified where monitoring will extend, and asked for formal, recurring briefings so Carlsbad officials and staff receive the same information at the same time.

Jamie Timberlake, coastal zone administrator for the city of Oceanside, said the ReBeach pilot grew from a 2020 feasibility study and public and scientific observations of chronic beach erosion. Timberlake described an international design competition that selected what she called "the living speed bumps design" — a concept modeled on an implemented reef system on Australia's Gold Coast — and said the winning concept couples roughly 900,000 cubic yards of nourishment with three retention constructs: two back‑beach headlands (projected to extend about 50 feet at grade from the back beach) and an artificial reef to be placed about 900 feet offshore in approximately 40 feet of water. Timberlake said the pilot will be sited in "segment 1," from Tyson Street to Wisconsin Avenue.

Timberlake said the project team will refine reef and headland geometry through numerical modeling and hopes to perform physical wave‑basin modeling to study how waves break on the reef. She described ongoing baseline monitoring of beach sand volumes that began in 2020, led in part by the community science group Save Oceanside Sand, and said Oceanside recently deployed an acoustic Doppler current profiler (ADCP) offshore to feed sediment‑transport models.

Carlsbad staff and commissioners raised two recurring concerns: how ReBeach would affect southward transport of sand to Carlsbad, and how Carlsbad could participate in technical review without triggering California open‑meeting rules. Parks and Recreation Director Kyle Lancaster summarized legal counsel advice that concerned Brown Act applicability and said Carlsbad declined to send a voting jury member to Oceanside's competition because those meetings were not run in a public forum. "Our city attorney's office did not agree with the Oceanside city attorney's office in terms of Brown Act applicability," Lancaster said.

Timberlake acknowledged Carlsbad council members' frustration about earlier communication and offered multiple collaboration options, including (1) a Beach Preservation Commission representative coordinating regularly with the ReBeach team and reporting back, (2) a technical advisory group that would include academic and regional partners (Scripps, UCI, SANDAG), (3) a North County regional working group involving Camp Pendleton, Oceanside, Carlsbad, Encinitas and State Parks, (4) continuing participation in SANDAG‑led sediment management efforts, and (5) periodic project update emails. She said the project team has held three public workshops (150–220 attendees each) and convened a jury with about 15 members during the design competition.

Carlsbad staff recommended that Timberlake provide updates to the full Beach Preservation Commission on a recurring basis and offered to collect monthly technical publications and modeling outputs and pass them to the commission. Staff said they would ask Timberlake to appear at commission meetings every other month and produce monthly or quarterly written updates as needed; commissioners and staff stressed that any advisory arrangement must be structured to avoid Brown Act violations.

Commissioners also asked for confirmation that Oceanside's baseline monitoring and modeling will include control points that extend into Carlsbad beaches. Timberlake said baseline monitoring does extend to the Tamarack jetties and that modeling and monitoring efforts will cover the littoral area down to those control points.

No formal motions or votes on ReBeach occurred during the Carlsbad meeting; the session was an informational update and discussion. Commissioners requested future agenda items including updates on local lagoon and dredging projects and a plan for receiving ReBeach technical materials. Timberlake and Carlsbad staff committed to working on a structure for technical feedback and regular updates.

Notes: The presentation repeatedly framed ReBeach as a pilot project; Oceanside staff emphasized the project remains in design refinement (reef depth/shape, sand quantity, and delivery logistics), and that adaptive‑management triggers and Coastal Commission permit conditions will formalize monitoring and response actions.