Ride the Iron Horse Trail through San Ramon on a Saturday morning and the crossing at Bollinger Canyon Road feels almost too easy. No waiting for a light, no darting between cars, just a smooth climb up a cable-supported bridge and back down the other side. Head north into Danville on the same trail this month and you will hit a fenced detour where crews are replacing a water line. Keep going into Walnut Creek and, starting October 5, a stretch near Mt. Diablo Boulevard closes outright for two weeks of tree work.

Same trail. Same 55 miles of old railroad grade running from Concord down through the Tri-Valley. Three completely different experiences depending on which few miles you happen to be standing on this fall. That is not an accident of scheduling. It is what happens when one small piece of a regional trail gets singled out for a rebuild that the rest of the corridor is nowhere near receiving.

What the Award Is Actually For

The Iron Horse Trail Bicycle and Pedestrian Overcrossing at Bollinger Canyon Road opened to the public on July 19, 2025, after roughly two years of construction. It picked up two 2026 Northern California APWA awards this year: Overall Project of the Year and Transportation Project of the Year in the $25 million to $75 million category.

The structure itself is a 340-foot, six-span, cable-supported bridge, with close to 900 feet of approach ramps and walls carrying trail users up and over Bollinger Canyon Road instead of through it. Before the bridge existed, that crossing was an at-grade intersection, the kind where a runner, a cyclist, and an eight-lane arterial all had to negotiate the same few seconds of green light. The bridge eliminated that crossing entirely.

It is a genuinely well-built piece of infrastructure. But the award is not really the interesting part of this story. The interesting part is why a bridge built only for people on foot and on bikes was even allowed to exist in that form, and what San Ramon is doing with the corridor now that it does.

The Forty-Year Rule Nobody Remembers

Contra Costa County bought the old railroad right of way between 1982 and 1986, using three grants from the California Transportation Commission that totaled $10.6 million. Those grants came with a condition: the county had to preserve a 34-foot-wide corridor for the eventual construction of a busway or other mass transit line. That obligation sat on the books for decades, largely unaddressed, while the corridor was renamed the Iron Horse Trail in the late 1980s and settled into its current life as a paved path for walking, running, biking, and horseback riding.

The mandate did not disappear until 2019, when legislation known as AB1025, with support from then-Assemblymember Tim Grayson, formally relieved the county of the requirement to build mass transit down the corridor. Once that obligation was lifted, the county and the city of San Ramon had a clear path to build exactly what residents actually wanted at Bollinger Canyon Road: a crossing built for bikes and pedestrians, full stop, with no busway to accommodate later.

That is the part of the award story that rarely makes it into the ribbon-cutting photos. The bridge you rode over this weekend exists in its current form because a decades-old strings-attached land deal finally got untied six years ago.

The Money Behind What Comes Next

With the overcrossing finished, attention on the San Ramon segment has moved to something bigger: a plan to physically separate cyclists from pedestrians along the trail surface itself, a concept the county calls dual tracking. County Supervisor Candace Andersen has described the design phase of the first segment as roughly 65% complete as of this summer.

What is notable is how that design work got funded. Rather than wait for a state or federal grant cycle, Andersen redirected about half a million dollars in park impact fees collected from unincorporated parts of San Ramon to pay for the first segment's design. Her reasoning, as she put it, was that she did not want the project sitting indefinitely while everyone waited on outside money. It is a small, practical workaround, and it is also the reason San Ramon has an active design underway right now while the rest of the 55-mile corridor does not.

Dual tracking will not touch the trail's basic character. It is still flat, still paved, still open to equestrians and dogs on leash. What it changes is the friction: right now, a cyclist and a family walking side by side share the same narrow strip of pavement, with no separation between wheels and feet. If the pilot segment moves forward as designed, San Ramon would be the only city on the entire corridor testing a separated bike lane built directly into the trail rather than routed onto an adjacent street.

Why the Rest of the Corridor Looks Different Right Now

None of this activity is happening in Danville or Walnut Creek at the moment. Those segments are dealing with maintenance, not redesign. As of early September, East Bay Regional Park District has the Danville segment between Wayne Avenue and Hartford Road closed for an East Bay Municipal Utility District water line repair, and Caltrans is doing overpass maintenance work near the Glen Arms Drive and Laurel Road trail access point, also in Danville, where riders are asked to stay on the paved trail and use caution. Further north, the Walnut Creek segment between Mt. Diablo Boulevard and Civic Park closes entirely from October 5 through October 12 so PG&E can do vegetation management and wildlife enhancement work.

None of that reflects poorly on those towns. Utility lines age everywhere, and vegetation work is routine maintenance on any regional trail. But it does mean that right now, if you are measuring the Iron Horse Trail by which segment is actually being reinvented for how people use it today, the stretch around Bollinger Canyon Road in San Ramon is the only part of the entire 55-mile corridor where that is happening.

The Twenty-Year Plan Riding Alongside It

The dual tracking pilot is not a standalone idea. It sits inside a larger document the San Ramon City Council took up for adoption on June 23, 2026: the city's first Trails Master Plan, a 20-year framework for the roughly 46 miles of public trail, 18 miles of access roads, and 14 miles of non-city trail woven through San Ramon.

The plan grew out of more than a year of community input, including a public survey and outreach at events like Run San Ramon and the Fourth of July concert, and it identifies a short list of priorities residents actually asked for: better connections between neighborhoods and open space, improved coordination with regional trail partners, and specifically, further improvements to the Iron Horse Trail alongside the East Bay Regional Park District. In other words, the plan residents pushed for and the dual tracking pilot already underway are pointed at the same problem from two different directions, one setting policy, the other pouring concrete.

What to Actually Watch This Fall

If you use the trail regularly, here is what matters between now and the end of the year:

• The Bollinger Canyon Road overcrossing is open and functioning as designed, and it is the reason the corridor picked up two industry awards this year.
• The dual tracking design for the first pilot segment is roughly two-thirds finished as of midsummer, meaning construction is still a ways off, but the funding and design work are real and moving.
• If you are heading north toward Danville, plan around the Wayne Avenue to Hartford Road closure and the Caltrans work near Glen Arms Drive.
• If your route runs through Walnut Creek, build in a detour for the first two weeks of October.
• The trail itself remains open to walkers, runners, cyclists, equestrians, and leashed dogs throughout San Ramon's 4.24-mile stretch, unaffected by the work happening in neighboring segments.

The Iron Horse Trail has been the same flat, paved railroad grade for close to forty years. What is changing is not the path itself but who gets to move through it without slowing down for someone else, and San Ramon is where that experiment is actually being built first.

I grew up walking pieces of this trail long before any of us called it a corridor, and I still notice which stretch feels different every time I'm out on it. If you are curious about what a specific block or segment of San Ramon looks like day to day, not just on a map but on foot, I am always glad to talk through it. Reach out to Ashley Mancera any time. Let's Connect.