Who Actually Built The Switchbacks At Waterdog Lake?

Every Saturday morning, the trailhead at Hallmark and Lake Road fills with the same regulars. Dog walkers heading for the lake loop. Trail runners stretching before the climb up Finch. Mountain bikers checking tire pressure before dropping into Chaparral. Ask any of them who built the trail under their feet, and most will guess the City of Belmont. They would be wrong.

Waterdog Lake and Open Space covers more than 260 acres in the hills above Ralston Avenue, and the city that owns the land did not build the network of singletrack that makes it worth visiting. A community of volunteer mountain bikers did, one switchback at a time, over more than three decades. That distinction matters more than it sounds, and it explains a few things about the park that residents who have lived here for years have never quite put together.

The Lake Was Never Meant For Recreation

Before it was a place to walk a dog or grind up a climb, Waterdog Lake was infrastructure. Banker William Ralston commissioned the lake in the 19th century to collect spring water and funnel it to his summer estate, the property now known as Ralston Hall Mansion. After Ralston's death, the Sisters of Notre Dame de Namur acquired the land and leased it to the City of Belmont in 1965. Thirteen years later, in 1978, local landowner John S. Brooks donated an additional 51 acres, which the city dedicated as the John S. Brooks Memorial Open Space, now folded into what most residents simply call Waterdog.

That layered history explains why the park feels assembled rather than planned. It was never designed as one recreation area from the start. It came together from a private water-collection lake, a religious order's land holding, and one family's gift, decades apart from each other.

The Trails Nobody On A City Payroll Built

The lake and the boundary lines came from institutions. The trails did not.

According to trail-mapping site Trailforks, the mountain biking community has long contributed to trail building and maintenance across the open space. The volunteer group Waterdog Open Space Stewards puts a number on that work: cyclists donate more than 500 hours of trail labor a year, and most of the trails residents ride and walk today were built and have been maintained by that same community for more than 30 years. The system now counts 26 named trails, 22 of them rated for mountain biking.

Some names are practical, like Lake Road and Canyon Creek. Others were clearly named by the people who rode them into existence, like Finch, Berry, Ohlone, and Elevator. John Brooks Trail is the longest in the system at 1.6 miles and carries the steepest sustained climb, 354 feet of elevation gain. Chaparral drops the most elevation on the way down, 364 feet, which is part of why it is popular with descending riders.

When Volunteer Maintenance Meets A City Liability Call

That last detail about Chaparral is worth sitting with, because it shows where the volunteer model runs into its limits.

In one recent stretch, storm damage forced the city to close a section of Chaparral Trail, and a second closure followed on a section of Rambler Trail for the same reason. City staff described themselves as still investigating repair options, with both sections closed until a plan was in place. This is not a story about neglect. It is a division of labor that most users never see spelled out. Volunteers build and maintain the everyday tread of the trail system, the ongoing work that keeps switchbacks rideable and drainage clear after a normal rain. But once damage crosses into a safety question, the decision to close a public trail sits with the city, not with the Trailkeepers who cut it in the first place.

Belmont's posted trail policy makes the same tradeoff explicit system-wide: trails close during rain events for the safety of both users and the land. Elsewhere in the city's open space network, a different trail once stayed shut straight through a Thanksgiving weekend while repairs were assessed, a sign that this pattern is standard practice rather than a one-time inconvenience. Anyone planning a full Waterdog loop this fall should check current conditions before counting on either Chaparral or Rambler being open.

Three Trailheads, Three Different Versions Of The Park

Waterdog is not one entry point with one experience. Depending on which trailhead you use, you get a noticeably different version of the park.

None of the three has a dedicated large parking lot. Street parking is the norm, which is part of why longtime users treat these as neighborhood access points rather than a destination lot you drive to from across town.

The Rules That Keep A Shared Trail Working

A trail system built by volunteers and used simultaneously by walkers, runners, and mountain bikers only holds together if everyone follows the same unwritten contract. Belmont has posted that contract at every trailhead:

• Wheels yield to heels, and descending riders yield to those climbing
• Stay on marked trails and off wet ones entirely, since a single set of tire tracks or footprints on saturated ground can undo hours of volunteer repair work
• Dogs stay on leash at all times, with Cipriani Dog Park as the designated off-leash option nearby
• No amplified sound, and the park closes at sunset

These read like small print until you consider how much of the trail's condition depends on people actually following them, rather than a paid crew showing up afterward to fix what foot and tire traffic wore down.

A Hundred Years, One Salamander

Waterdog Lake takes its name from the aquatic salamander native to the area, and Belmont has leaned into that identity as the city marks its centennial this year. The city's new website chatbot, introduced as part of the milestone celebration, is named Lizzie and modeled after the same waterdog salamander the park is named for. It is a small detail, but it says something about how thoroughly this park has become shorthand for the city itself, not just a recreation amenity tucked into the hills above Ralston Avenue.

For a resident who has only ever thought of Waterdog as a nice place to walk the dog before work, the fuller picture is worth knowing. The lake was built for a 19th-century mansion. The land came from a religious order and a private family gift, decades apart. And the trails under your feet, the ones that make the loop worth doing twice, exist because a small group of neighbors kept showing up with tools for thirty years running.

If you already call this part of Belmont home, none of that changes your Saturday morning routine. But it might change how you think about the ground under it, and about what keeps a place like this running when no one is watching.

LeDoux Group has spent years getting to know the neighborhoods on this side of the Peninsula, Waterdog included, and we think knowing the trail history matters as much as knowing the closing costs. If you are curious what a home near this kind of neighborhood infrastructure is worth today, Request Your Free Home Valuation and we will walk you through it.