Mountain View's Newest Bay Trail Opened This Year. Why Is It Already Fenced Off?

At the north end of the Stevens Creek Trail there's an entry gate onto refuge land. Past it, the Song Sparrow Spur Trail runs 1.2 miles along the eastern and northern levees of Pond A2W, with Bay views, a lookout, two armored bridges and benches. On February 20, 2026, officials and residents met there to celebrate turning a 435-acre former salt pond into tidal marsh. Since August 31, the spur has been closed.

Mountain View's bayfront is a restoration site that will stay under construction into 2028, and the trail celebrated in February is one stage in that work. Until then, how much of Shoreline you can use depends on the day of the week, the month, and which pond crews are working on.

Six Months From Ribbon-Cutting to Riprap

Pond A2W was the first big piece. Mountain View Voice reported that crews repaired eroding levees, built five habitat islands and added 1.2 miles of public trail. Construction wrapped up at the end of January, and the project cost an estimated $20 million. At the February event, City Council member Pat Showalter, a civil engineer who once worked on the salt pond project management team at Valley Water, told the crowd:

"We should be very proud of this accomplishment, and also, we should take great pleasure as time goes on, watching it develop into a marsh."

That marsh takes time to form. Dave Halsing, executive project manager of the South Bay Salt Pond Restoration Project, told the Voice that each incoming tide carries sediment and seeds that settle and grow into marsh. Chris Barr, acting complex manager for the San Francisco Bay National Wildlife Refuge, said the pond should be a full marsh "in less than a decade."

The spur sits on top of the levees that hold that pond in place. The U.S. Fish and Wildlife Service closure notice puts the repair work at Pond A2W, inside the Don Edwards San Francisco Bay National Wildlife Refuge, from August 31 through November 2026. The city's trail page describes the work as earthen fill and rock riprap placed against erosion damage on the pond-facing sides of the eastern and northern levees. The goal is to keep the new trail, keep vehicle access for refuge staff and authorized researchers, and let PG&E crews reach their equipment. Put simply, the repairs protect the trail itself.

Three Work Zones, Three Different Clocks

The spur isn't the only closure. The city lists three active projects on the bayfront, and each runs on its own schedule.

The city says no detour is needed for the A2W closures. The spur and the north end of the Stevens Creek Trail are out-and-back trails, and the closed stretch lies north of the last trail junction. Trucks reach the site by Amphitheatre Parkway, North Shoreline Boulevard, Crittenden Lane, Shoreline Park service roads and finally the Stevens Creek Trail. That's why the trail's north end shuts for deliveries.

The Pond A1 hauling follows a different pattern. Trucks come up San Antonio Road onto Terminal Boulevard and into Shoreline Park on paved trails, and the interruptions happen only on weekdays between 7:30 a.m. and 4 p.m. Flaggers and signs manage the crossings. The city says the Bay Trail and most park trails stay open whenever trucks aren't running. Weekend mornings and weekday evenings fall outside those hours. The pump station closure falls this week, and the city notes that its schedule may change. The Permanente Creek Trail, including its Amphitheatre Parkway underpass, is listed as open.

The Larger Project Is Still Ahead

The trucks near Terminal Boulevard are an early stage of the next restoration, which will be bigger than A2W. Pond A1 sits just north of Shoreline Park and east of Charleston Slough. It will be converted from open water enclosed by levees into tidal marsh, with new habitat islands and improved levees. The South Bay Salt Pond Restoration Project says A1 will also get a new public trail and viewing platform, plus a habitat slope meant to protect Shoreline Park from erosion. The trail disruptions are listed as running from late 2024 through 2027.

A1 actually has two schedules, and they're easy to mix up. The material import is already underway. Main construction is a separate phase: an April 14, 2026 press release from the restoration project says it is expected to start in late 2026 or 2027 and finish in 2028, with monitoring continuing after that. The same release names Ducks Unlimited as the construction-management partner and says Google support pays for much of A1's construction and environmental monitoring.

When both ponds are done, they're meant to join. In January, the Voice described the eventual result as one big marsh of nearly 700 acres. The A2W levee work now underway protects the first half of that marsh while crews begin preparing the second.

What the Bayfront Offers on a Fall Saturday

Since weekday hauling hours shape the A1 side, Saturdays are the easiest time to visit, and this month's calendar reflects that.

• Saturday, October 17, 9 a.m. to noon. Grassroots Ecology hosts "Volunteer Outdoors in MV Shoreline Marsh Habitat Restoration," with parking at 1600 Amphitheatre Parkway.
• Saturday, October 24, 8:30 to 11 a.m. The Santa Clara Valley Bird Alliance holds a free drop-in, "Fall Migration at the Bay!", with docents on the Charleston Slough observation deck. Registration is optional, and loaner binoculars are available. You park along Terminal Boulevard, the same road the A1 trucks use on weekdays, and the deck is about an eighth of a mile from the restrooms at Terminal and San Antonio. The organizers suggest bringing layers.
• Any day. The Shoreline Lake Boathouse is open and rents pedalboats, rowboats, kayaks, sailboats, bicycles, scooters and SUP boards. It also runs an espresso bar with snacks and patio seating. Hours are 10 a.m. to 6:30 p.m. on weekdays and 10 a.m. to 7 p.m. on weekends, and the last rentals go out one hour before closing.

The American Bistro is closed for remodeling. Mountain View Voice reported in 2025 that the Boathouse and café renovation would cost $14.8 million. The city's September 2026 project update says construction began in January 2026 and should finish in spring 2027. If you're walking a dog, use the Stevens Creek Trail south of Crittenden Lane. Domestic animals aren't allowed in Shoreline.

The city is also spending more to monitor the meadows next to the ponds. The Los Altos Town Crier reported that in April the City Council unanimously approved an additional $105,000 for burrowing owl monitoring by LSA Associates, bringing that fiscal-year contract to $345,000. According to the city's wildlife page, LSA counted 8 owls in September 2026, compared with 16 in January 2026. In September it mapped 11 burrows showing signs of activity in the Northeast Meadowlands and the golf course's Back 9. In January 2025, the count was 27.

What Comes Back, in Order

Based on current agency schedules, which can change, the bayfront reopens in this order:

1. After October 16: the Adobe Creek Loop connection to the Bay Trail reopens once the pump station pipe work is done.
2. After November 2026: the Song Sparrow Spur reopens when the A2W levee repairs finish. Interpretive signs for the trail are scheduled to go in by the end of 2026.
3. Spring 2027: the expanded Shoreline Lake Boathouse and café are due to be finished.
4. Through 2027: weekday A1 hauling continues to interrupt the trails near Terminal Boulevard.
5. 2028: main construction at Pond A1 is expected to finish, with monitoring continuing afterward.

Trail hours stay the same through all of this, from 6 a.m. to half an hour after sunset. For a quick check before you head out, the city posts updates on its trail status page and takes questions at [email protected].

Projects like this, with dates that keep shifting, are what Gupta Heights tracks for clients who want to understand how North Bayshore and the bayfront will change by 2028. If you'd like to go over the project timelines that affect your part of Mountain View, schedule a consultation.