Walk the bluff trail through Castaways Park on any weekday morning and you will pass the same handful of neighbors doing the same handful of things. A woman with two spaniels who always turns back at the war memorial. A guy on a beach cruiser who takes the same detour down toward Dover Drive every time. None of them are trying to finish anything. They are just doing their loop, whichever piece of the Back Bay counts as their loop that day.
That distinction matters more than usual this fall, because one piece of the Back Bay just came back into rotation after a closure that ran through construction season. Big Canyon Nature Park, the wooded pocket on the east side of the bay near Jamboree Road, closed its through-trails while crews worked through the final phase of a habitat restoration project. The closure window listed on the Newport Bay Conservancy's own project page ran through June 2026, which means the shaded, creek-lined alternative to the open marsh has only been walkable again for a few months as of this writing. If you live in Dover Shores and haven't rerouted your dog walk through there yet, this is the season to do it.
The trail that measures differently depending on who's counting
Search for the Back Bay Loop and you will get contradictory numbers before you get out the door. One AllTrails listing puts it at 2.8 miles. Another set of tracking apps clocks a running version at 10.2 miles and a hiking version at 8.2. The Newport Bay Conservancy's own materials describe a 10.5-mile bike loop that circles the entire bay starting from Jamboree at San Diego Creek.
None of those numbers are wrong. They are measuring different combinations of the same connected pieces, because the loop does not actually stay a loop the whole way around. At least two points along the route drop you onto a residential street until the paved path picks back up again. A cyclist doing the full 10.5-mile circuit through Vista Point, Back Bay Drive, and Irvine Avenue is covering a different route than a walker doing the paved 2.8-mile stretch near Dover Drive, even though both would tell you, honestly, that they did the Back Bay this morning.
That is not a knock on the trail. It is the reason residents here rarely think of it as one thing to complete. They think of it as a handful of destinations, each with its own personality, and they pick the one that fits the morning.
What was actually closed, and why it took this long
Big Canyon has been under construction in pieces since 2017. The first phase, finished that year, restored six acres near Jamboree Road and dealt with selenium contamination in the creek along with stormwater pollutants. A second phase focused on removing invasive Brazilian pepper trees and stabilizing the creek bank.
The third and final phase broke ground in September 2025, according to the City of Newport Beach's own account of the project. It restores 13.8 acres east of Back Bay Drive and is funded entirely through more than $7 million in state grants from the California State Coastal Conservancy, the Ocean Protection Council, and the Wildlife Conservation Board, meaning the City did not have to cover construction costs out of its own budget. The work is described as the largest environmental restoration project the City has undertaken, and it is designed to let salt marsh habitat migrate upslope as sea levels rise, rather than simply patching what erodes.
That is a long way of saying the closure was not a minor maintenance gap. It was the final stretch of a multi-year, multi-phase habitat rebuild on a 60-acre parcel, and the trails through it stayed off limits from the parking lot on Back Bay Drive all the way to Jamboree Road for the better part of a year while Phase 3 was under construction.
The rotation Dover Shores already runs
None of this changes what Saturday looks like for most people here, but it does add a piece back to the map. Here is roughly how the week already splits, based on what each spot actually offers.
| Day | Spot | What it actually is |
|---|---|---|
| Saturday | North Star Beach / Newport Aquatic Center | Naturalist-guided kayak tour, $25 per person, ages 8 and up, 10am to noon |
| Sunday | Back Bay Science Center, Shellmaker Island | Free open-house Community Day, 10am to 2pm, touch tanks and native plant nursery |
| Any weekday | Castaways Park | Paved bluff trail, Marine War Memorial, parking off Dover Drive |
| Now reopened | Big Canyon Nature Park | Shaded creek trail from Back Bay Drive to Jamboree, quiet alternative to open marsh |
The Saturday kayak tour, run by the Newport Bay Conservancy in partnership with the Newport Aquatic Center, launches from North Star Beach next to the Aquatic Center. No experience is required. A volunteer naturalist runs a quick safety lesson before pointing out what is living in the mud and shallows along the way.
Sunday belongs to the Back Bay Science Center on Shellmaker Island, which opens to the public for free between 10am and 2pm most weeks. It is a working research facility rather than a polished visitor center, which is part of the appeal. You can walk through the teaching lab, look at the touch tanks, and check out the Community Day open house schedule, which sometimes includes a short naturalist-led walk around Shellmaker Island at 11am or 1pm. Gates close at 2pm sharp, so this is not a spot to leave a car parked past closing.
Castaways Park handles the rest of the week. It is the paved, dog-friendly bluff trail most people picture when they think of walking near the bay, with benches looking out over the water, a permanent flag pole, and a bronze memorial to the Marines who once trained near this stretch of coast. Parking and restrooms are at Bob Henry Park across Castaways Lane, not at the trailhead itself.
Why the reopened piece feels different from the rest
Big Canyon was never going to replace any of that. It offers something the other three spots do not: shade. Most of the Back Bay is open marsh, which means full sun and, in summer, a breeze that makes it bearable but rarely a break from the glare. Big Canyon is different by design. It follows a creek through cattails and bay laurel rather than open mudflats, which makes it the quieter option for someone who wants trees and shadow rather than sky and wind.
Mariah Sabo, an education specialist with the Newport Bay Conservancy, put it simply in a piece for Newport Beach Magazine: "Newport Bay is really proud of the ongoing restoration efforts in Big Canyon." That pride shows up in the details. Bush sunflowers along the path, cottontail rabbits in the undergrowth, red-tailed hawks overhead. It is a different kind of walk than the open-water version most people default to.
If you haven't been since before the closure, the difference is worth the drive. If you have never gone at all, this fall, before the marsh cools off and the mudflat side gets crowded with migrating birds, is a reasonable time to start.
A few things worth knowing before you go
Dogs are welcome on leash across the paved sections of the Back Bay, though the Aquatic Center does not allow dogs on rented kayaks or paddleboards. There are no restrooms along most of the trail system, with the main exceptions being Bob Henry Park near Castaways and the portable facilities near the Big Canyon and University Drive junction. North Star Beach itself is not a lifeguarded swimming spot, more a place for toddlers to wade than a beach day destination, so plan around that if you are bringing small kids.
None of this requires finishing a loop. That has always been the actual local habit here, long before Big Canyon reopened. You pick your piece, you do it, and you go home. The reopening just means there is one more good option on the list.
Dover Shores sits directly against this stretch of the Upper Newport Bay, which is part of why the neighborhood's daily rhythm looks the way it does. If you want a closer look at what that rhythm feels like beyond the trail system, our Dover Shores neighborhood page and our earlier piece on what everyday life feels like here both go deeper. And if you ever want to talk through what a specific street near the bay actually feels like to live on, that is a conversation Mason | Taylor Associates is always glad to have.
