Walk the Batiquitos Lagoon Trail on a Saturday morning and the water moves. Tide comes in, tide goes out, egrets work the mudflats at the edges where salt water meets shore. Walk the Buena Vista Lagoon Ecological Reserve Trail that same evening, a few miles up the coast, and the water sits still behind a concrete weir, thick with cattails that have been creeping in for decades.
Both trails are in Carlsbad. Both belong to lagoons the city treats as points of pride. The city itself notes that Carlsbad is the only city in California with three distinct lagoons. But if you've walked both this year, you already know they are not living in the same decade. One got its fix. The other is still filing paperwork.
The Same Coastline, Two Different Decades
Batiquitos Lagoon, a 561-acre preserve on Carlsbad's southern border with Encinitas, got its major restoration in the mid-1990s, when the City of Carlsbad, the Port of Los Angeles and other agencies dredged the basin back open to the ocean. That fix has needed maintenance since, and it got it: Marathon Construction, a local contractor with a growing résumé of San Diego County lagoon work, dredged Batiquitos again in the winter of 2023 to keep that restoration intact.
Buena Vista Lagoon, on Carlsbad's northern border with Oceanside, never got that treatment. It is the only freshwater lagoon left in Southern California, which sounds like a distinction until you learn why. A concrete weir at the ocean end keeps saltwater out, and without tidal flushing, sediment and vegetation have nowhere to go. The lagoon has been filling in with cattails and mud for years, the same story residents and agencies have been negotiating since a feasibility study back in 2004.
The contractor waiting to fix it is the same one that already finished the job twice elsewhere. Marathon Construction completed the San Elijo Lagoon restoration on the Encinitas-Solana Beach border in 2022 and the San Dieguito Lagoon restoration at Del Mar in 2024, on top of the Batiquitos dredging. Speaking at a recent meeting of the Buena Vista Lagoon Joint Powers Committee, which brings together Carlsbad and Oceanside officials on a quarterly basis, Marathon's Jon Ruth put it plainly:
"After 20 years of studies and community meetings it's time to act. It is a hidden national treasure that has been deteriorating over the decades."
Where the Money Went, and Didn't
The gap between what's finished and what's still stalled comes down to where the funding came from. San Elijo's restoration drew more than $90 million of its roughly $120 million cost from the North Coast Corridor Program, a joint SANDAG-Caltrans effort that treated lagoon restoration as environmental mitigation for widening Interstate 5. San Dieguito benefited from a similar mitigation pipeline. That pipeline is largely spent now, which is part of why Buena Vista never rode the same wave: its restoration got swept up in decades of dispute over whether to remove the weir at all, and by the time a compromise was reached in 2020, the highway-mitigation money that funded its neighbors had already been allocated elsewhere.
Here's how the four projects line up as of this summer:
| Lagoon | Contractor | Status | Primary funding source |
|---|---|---|---|
| San Elijo (Encinitas/Solana Beach) | Marathon Construction | Completed 2022 | North Coast Corridor mitigation (I-5 widening) |
| San Dieguito (Del Mar) | Marathon Construction | Completed 2024 | North Coast Corridor mitigation |
| Batiquitos (Carlsbad/Encinitas) | Marathon Construction | Dredged 2023, maintaining 1990s restoration | City/Port of Los Angeles partnership |
| Buena Vista (Carlsbad/Oceanside) | Not yet awarded | In design; full project estimated 5 to 6 years out as of June 2026 | Piecemeal grants and federal earmarks |
Buena Vista's funding has arrived in installments instead of one mitigation package. As of June 2026, SANDAG has secured $1 million in federal money through a NOAA-administered earmark, earmarked specifically for the channel guide and bridge design components, with that piece of work anticipated to begin in late 2026 or early 2027. But SANDAG still needs roughly $3.2 million more just to reach 65 percent design completion on the broader Modified Saltwater Alternative, the plan that would remove the weir entirely and reconnect the lagoon to the tide. The overall timeline from design to finished construction is currently estimated at five to six years, with the construction phase alone expected to take about two and a half years once it starts.
What's Actually Moving at Buena Vista Right Now
None of this means nothing is happening on the ground. Two separate projects are working through permitting in parallel with the big enhancement plan.
The first is a weir repair, a stopgap fix using interlocking steel sheet piles, meant to hold the existing structure together while the resource agencies review permits. It is explicitly temporary. Once the larger enhancement project moves forward and the weir comes out for good, this repair goes with it.
The second is the Buena Vista Audubon Society's own Wetlands Reserve Restoration Project, a smaller 3.5-acre effort adjacent to the main lagoon that aims to improve coastal access and water quality, with an ongoing partnership involving Indigenous nations as part of the design. That project hit its own permitting friction and had to redesign to reduce grading and open water, which cut into the amount of clean sediment it could export to nearby beaches. The trail, the water quality features and the Indigenous gathering area survived the redesign untouched, and the modeling suggests the restored wetland will stay open to tidal flushing and remain accessible even as sea levels shift over time.
Both projects are proceeding. Neither is finished. That's the honest state of Buena Vista in 2026: real progress, real funding secured, still years from the tidal lagoon its southern neighbors already have.
What You'll Notice on the Trail This Year
If you already walk this stretch of coast, here's what hasn't changed and what's worth knowing before you go:
- The Buena Vista Lagoon Ecological Reserve Trail is a 0.3-mile loop, flat and easy, with dogs allowed on leash. There are no dogs permitted on the adjacent beach itself.
- Bicycles are not part of the plan here. The Audubon Society's redesign explicitly favors slow recreation like walking and birding over cycling, while keeping the trail ADA accessible.
- The Buena Vista Audubon Society runs a monthly lagoon bird count on the fourth Saturday of every month, and regularly logs between 40 and 60 species on a single count.
- The lagoon sits on the Pacific Flyway, and the city's own count puts more than 235 bird species spotted there over time, including the California Quail, the Vermillion Flycatcher and the Great Blue Heron. Migration brings the heaviest traffic in winter and summer.
- The nature center sits on the lagoon's north edge and includes a second-floor observation deck with telescopes aimed out toward the water and the ocean beyond, a good spot to watch the lagoon without committing to the full loop.
None of that changes because the enhancement project is still years out. If anything, it's the reason to go now rather than wait for a finished product that's still working through funding.
The Real Takeaway
Buena Vista Lagoon isn't neglected. It's next in line, and the line has been long because the shortcut that funded its neighbors, highway-widening mitigation money, ran out before Buena Vista's turn came up. What's left is the slower path: earmarks, grant applications, redesigns that shave down scope to satisfy permitting agencies. That's not a dramatic story, but it's the accurate one, and it explains something residents notice on their own walks without anyone spelling it out: two of Carlsbad's neighboring lagoons look finished, and the third one still looks like it's waiting its turn.
If you spend enough time on these trails, you start to read the coastline the way people who've lived here for decades do, not as a postcard but as a set of decisions still being made. That kind of attention to what's actually happening in a neighborhood, not just what it looks like from the road, is the same instinct we bring to the properties we represent along this coast.
If you're weighing what a home near this stretch of Carlsbad is really worth, or thinking ahead to when Buena Vista's restoration finally breaks ground, WM Luxury Real Estate is glad to talk through what we're seeing on the ground. Request a private consultation whenever you're ready.
