Today the gates at 200 Portofino Way are open like they have been since May. Tomorrow that stops. Seaside Lagoon closes Tuesday through Thursday, September 1 through 3, then reopens for one last stretch, Friday through Labor Day itself on September 7, before it shuts down for the season the way it has for decades. If you've spent a summer Saturday there with a cooler and a folding chair watching your kids go down that little slide into the salt water, you already know the rhythm. Open Memorial Day weekend, close after Labor Day, back again next May.

What's different this year is that the version of the lagoon you just spent the summer in is not the version you're going to get back.

The Renovation That's Been "In the Works" for Twenty Years

City Manager Mike Witzansky said it plainly to the council in April: this conversation about fixing Seaside Lagoon has been going on for two decades. That's not an exaggeration built for a headline. The city hired Nuvis Landscape Architecture back in February 2023 to design a full overhaul, backed by a $10 million state grant secured in 2021, with early estimates for a complete reconstruction running north of $30 million. Residents who showed up to those early planning sessions asked for a lap pool and a great lawn. The city drew up concepts. Years passed.

What actually got approved this April was smaller. A lot smaller.

The council voted 5-0 to move forward with what staff called Option 2, a pared-down rebuild that keeps a sand-entry, zero-depth area for kids and a deeper swim zone, but drops the separate lap pool entirely. That single change matters more than it sounds like it should, because the lap pool wasn't cut for lack of interest. It was cut because LA County Public Health determined that a lagoon and a lap pool would need physically separate filtration systems, and that requirement alone would have pushed the project's cost above $16 million. The version that survived is priced at roughly $9.5 to $11 million, depending on which council estimate you're reading.

Why the Timeline Suddenly Matters

Here's the part that explains why a twenty-year conversation is suddenly moving with real urgency. Staff recommended entitling only this first phase and pushing coastal permitting through fast, and the reason they gave wasn't water quality or resident demand. It was two events on the calendar that have nothing to do with your kid's summer: the BeachLife Festival returning to the harbor in May 2028, and the 2028 Olympic Games arriving in Los Angeles that same year.

The target construction start is April 2027, with roughly ten months of building, aiming for completion in early 2028, in time for those two events. That's the deadline the smaller design is being built around. Not the version residents originally sketched out with the city, the version that fits the window before the world shows up.

So the shape of what you're getting back isn't a compromise between resident wishes and budget. It's a compromise between resident wishes and a hard date that was set by outside events.

What the New Lagoon Actually Looks Like

Strip away the politics and the new design does address a real, specific problem with the current lagoon. Right now, Seaside Lagoon pulls seawater from the far side of the breakwater, chlorinates it, holds about 1.5 million gallons, and discharges it back into the harbor after de-chlorinating it. That intake-and-discharge system is expensive to maintain and it's the reason the lagoon shut down for two weeks during prime season last year after a pump failure, at a repair cost of about $60,000. The city has also absorbed roughly $175,000 in state water-quality fines tied to the discharge system over the years, negotiated down from the original amount.

The replacement ditches the ocean-water model entirely. The new lagoon will hold about 770,000 gallons, covering roughly an acre, with a maximum depth of five feet built up over the existing bulkhead rather than dug deeper, which avoids costly dewatering excavation. Water will recirculate through a new pump and filtration building at 3,000 gallons per minute, meaning the entire lagoon turns over roughly every 4.3 hours instead of relying on a continuous ocean draw. Also included: a sand beach entry, a new water slide, splash jets and fountain features, an ADA-accessible design, upgraded restrooms and outdoor showers, and renovated perimeter fencing.

What that means for you in practice:

• Fewer surprise mid-summer closures, since the recirculating system removes the single point of failure that shut things down in 2025.
• The lagoon itself moves north within the same fenced footprint, but the sand-and-water experience your kids know stays recognizable.
• No lap pool, and no great lawn in this phase. Those got scoped out to hit both the budget and the 2028 date.

The Question Nobody Has Fully Answered Yet

There's a wrinkle worth knowing about if you've lived in Redondo Beach long enough to remember the last big fight over this waterfront. Seaside Lagoon sits under the protection of Measure C, the 2016 voter initiative that blocked a $400 million CenterCal redevelopment plan for the harbor, a plan that would have opened the lagoon to the ocean and connected it to harbor waters. Measure C requires that any replacement preserve the lagoon's function as an equivalent public recreational facility, and it explicitly bars converting it into an open-water beach.

The person who wrote Measure C has been actively involved in reviewing this design, and has gone on record saying an earlier version of the plan, including the elimination of a shade structure called the Lanai, didn't meet the measure's standard, prompting changes before it went back to the council. That back-and-forth isn't over. The project still needs sign-off from the California Coastal Commission, and the compliance question, whether this leaner version genuinely counts as "equivalent" to what voters protected in 2016, hasn't been tested by that final review yet.

What This Means for Your Next Few Summers

Put the pieces together and here's the practical calendar. The 2026 season closing out this week is the last full season with the lagoon in its current form. Construction is targeted to begin in April 2027, which likely means no lagoon season at all next summer, or at best a partial one depending on how permitting goes. The city's goal is to have the new facility open and tested before the BeachLife Festival returns in May 2028.

If you've got a toddler this year who'll be old enough for the deep end by the time this reopens, the lagoon they eventually get will look different from the one you're used to. Smaller in ambition than what residents were shown a few years ago, but built to stop breaking down mid-July, and built to a deadline that has almost nothing to do with your family's calendar and everything to do with two events the whole world is watching.

Whatever else changes at King Harbor over the next two years, that's worth keeping straight before you make next summer's plans around a lagoon that may not be open.

If you're the kind of Redondo Beach resident who tracks what's happening at the harbor because you actually live near it and care where the neighborhood is headed, that instinct is exactly what makes a good real estate conversation eventually worth having. When you're ready for one, California Collective is happy to book a curated neighborhood consultation, no pressure, just two people who know this stretch of coastline talking through what's next.