Early this month, walkers on the San Elijo Lagoon trails started seeing small schools of fish below the surface, stingrays gliding through the channels and large striped mullet diving out of sight. Nature Collective described the visibility as unprecedented in an October 9 post. It said people who have walked these trails for decades are seeing the channels in a way they had not before.
The rain forecast for that weekend was expected to cloud the water, and the same Nature Collective post said as much. But the clear week was more than luck. It showed the lagoon behaving the way it was rebuilt to behave. Because the restoration changed how much ocean water moves through the channels, clear water is now a condition that returns. Anyone who walks the Cardiff side of the reserve can learn to time it.
The restoration tripled the lagoon's tidal exchange
Nature Collective credits the change mainly to the San Elijo Lagoon Restoration Project. The project tripled the lagoon's tidal prism, the total volume of water traded between the lagoon and the Pacific in one tidal cycle.
Incoming tides carry clear, low-sediment ocean water. Freshwater running off the inland watershed carries suspended sediment. Water clarity in any coastal lagoon swings between those two sources. Tripling the daily volume of ocean water tilts the balance for good, and Nature Collective says the lagoon now "maintains far better overall clarity than it did historically."
So the early-October views were the restored system at its best on a good day. Nature Collective staff and water quality interns follow it closely. They collect samples every week, download data from continuous monitoring stations and sample during storms. During one routine cleaning of a submerged monitoring device, the team found a small octopus clinging to the equipment.
The conditions that line up on a clear day
Nature Collective says a striking day depends on several factors arriving together. Here they are as a checklist:
- An incoming tide, which pushes clear ocean water up the channels
- Favorable light with a high sun angle, which lets you see down into the water instead of off its surface
- Calm wind, which keeps ripples from breaking up the view
- No recent rain, because the lagoon takes runoff from the entire Escondido Creek watershed, and stormwater clouds the channels until the daily tides clear them again
- An open inlet, because when sand builds up at the beach and cuts the channel off from the ocean, clarity drops
In practice, that means a calm, dry, sunny midday with the tide coming in. When a storm passes through, the tides need time to reset the system before the clear water comes back.
The inlet is the one factor you cannot read from a tide chart. It closes on its own schedule. The most recent closure Nature Collective reported came in March, when the channel was mostly blocked. A seven-day dig was scheduled to start March 19 to reconnect the lagoon to the ocean, with the removed sand going to rebuild the Cardiff Living Shoreline dunes south of the Chart House. Nature Collective's news page is the place to check before planning a walk around clear water.
The restoration also built the best place to look
The best view of the clear water comes from structures the same restoration built. Nature Collective says the pedestrian bridges put viewers directly above the channel, which gives "an optimal, glare-free view into the water column."
Those are the Martin Nature Bridge and the Buhr Nature Bridge, which link the Nature Center Loop Trail to the Pole Trail. From the bridges there is more to look for than fish. Nature Collective's restoration project page points to patches of eelgrass in the main channel, a strong sign of high-quality underwater habitat. It also points to the large stands of California cordgrass along the Pole Trail, habitat for the federally endangered Ridgway's Rail.
Two of the routes below reach the bridges, and the others reach different parts of the channels.
| Route | Start | Distance listed | How it reaches the channels |
|---|---|---|---|
| Rios West Trail to Nature Center | Rios Avenue trailhead, neighborhood street parking | 3 miles round trip | Crosses Martin Nature Bridge, then Buhr Nature Bridge |
| Nature Center Loop Trail | Nature Center, 2710 Manchester Ave., Cardiff-by-the-Sea | 1-mile double loop | Connects to the Pole Trail by the same two bridges |
| Rios East Trail | Rios Avenue trailhead | 1.2 miles round trip | Close views of estuary channels |
| Harbaugh Seaside Trails | Seaside State Beach parking, across Highway 101 | 0.5 mile round trip | West basin outlook, undercrossing to Rios West |
| Via Poco Trail to Annie's Canyon | San Elijo Activity Hub Park & Ride | 2 miles round trip | Crosses under I-5 on the suspension pedestrian bridge |
On Rios West, the trail splits at the 0.4-mile mark. One way goes straight on toward the Nature Center Loop and the bridges. The other takes the undercrossing toward Harbaugh Seaside Trails. The Manchester Avenue start is shorter. The County lists the Nature Center as open 9 a.m. to 5 p.m. daily. The paved lot has 19 spaces, including ADA, carpool and EV stalls. On a midday with the tide coming in, those 19 spaces are the limit, and Rios Avenue street parking is the fallback.
The oldest lagoon crossing faces a redesign decision
The bridges inland were built for looking at the lagoon. The Coast Highway 101 bridge over the inlet, just south of the San Elijo State Beach campground, was built in 1934 and widened in 1953. It carries two vehicle lanes each way, a protected bike lane each way and a pedestrian walkway on each edge. The San Diego Union-Tribune reported in September that the western walkway, the one with the ocean views, is more popular with walkers but narrower than the eastern one.
A citywide assessment of Encinitas's 46 bridges rated this one "poor." The Union-Tribune reported that it found chipped concrete and rusting rebar. Engineer Kelly Burnell of Kleinfelder, Inc. told the City Council that "poor doesn't mean unsafe," only that the bridge needs repair. The rating makes the bridge eligible for a Federal Highway Administration funding program.
Walkers will feel the funding split. According to the Union-Tribune, repairs would be paid with grant money plus about $3.5 million in city matching funds. Improvements such as widening the narrow walkway count as "betterments," and Encinitas would pay their full cost. City Engineering Director Dan Nutter said construction could be about five years away while the city and Caltrans settle the project's scope. "This is an arduous process," he told the council. Council member Joy Lyndes, who represents Cardiff, said residents will want the betterments given how many pedestrians and cyclists cross every day. She argued for doing them alongside the repair work. "We're probably never going to have a better opportunity," she said.
For anyone who walks the lagoon regularly, that is the infrastructure item to follow in the coming years. The newest bridges were designed around the view, and the oldest one has its narrowest walkway on the ocean side.
Free tours and volunteer mornings through December
Nature Collective's calendar for the rest of 2026 mixes guided tours with volunteer restoration mornings and a family day. Every program below is free and requires registration.
- November 4. Volunteer Restoration Event, 9 a.m. to noon, removing invasive plants and restoring natives. Ages 6 and up; minors come with a guardian.
- November 7. Discovery Tour, 10 to 11:30 a.m., on the Nature Center Loop Trail, the route to the bridges. Ages 9 and up.
- November 14. Wildlife Tour for ages 15 and up, focused on late-fall arrivals: shorebirds, ducks, songbirds and birds of prey, including the White-crowned Sparrow, Yellow-rumped Warbler and Northern Harrier. Check the start time on the registration page.
- November 21 and December 2. Volunteer Restoration Events, 9 a.m. to noon.
- December 5. Discovery Tour, 10 to 11:30 a.m., Nature Center Loop Trail, with time set aside for watching and listening for birds.
- December 6. Family Fun Day, two hours of hands-on activities about seeds and how plants spread them.
- December 12. Wildlife Tour, 9 to 11 a.m., with a winter theme: coyote brush seeds, bud galls and Toyon berries.
- December 19. Volunteer Restoration Event, 9 a.m. to noon.
The December 6 Family Fun Day falls on the same Sunday as the free Cardiff Kringle Mingle on Aberdeen Drive, with Santa photos and musical performances. Eight days earlier, on November 28, Cardiff 101's Small Business Saturday offers savings at more than 20 local businesses and the annual poster giveaway with purchase. November 28 is also when the Holiday Passport to Savings starts, running through January 31, 2027.
At White Label Home Collective, we keep track of what makes Cardiff's daily routines special, and an hour on the Martin Nature Bridge with the tide coming in is one of them. If you are weighing a move to a home within walking distance of the lagoon, or thinking about selling a home that already is, schedule a private, white-glove consultation with our team.
