If you have driven Diablo Road toward Fairway Drive any time since June, you have met the flagger. One lane closes, a sign goes up, and the two directions of traffic take turns crawling past a retaining wall going in next to Green Valley Creek. It is not a long delay most mornings, but it lands right at school drop-off, and by now most people who live here have learned to leave five minutes earlier or cut over to Alameda Diablo instead.
What is actually happening behind that flagger is more interesting than a typical road project, and it says something true about how this particular corner of Contra Costa County gets things done. The trail being built there was first sketched out in 1989. It took a private ranch subdivision, a decade of fundraising, and, this spring, a wait for a few birds to finish nesting before the crews could get back to work. Money alone never bought this project speed. It still isn't.
Thirty-Six Years, One Ranch, and 93 Percent Open Space
The Danville Townwide Trail Master Plan, adopted in 1989, envisioned building a multi-purpose trail to close the gap between the existing Barbara Hale Trail and access to Mount Diablo State Park. The problem was never vision. It was terrain and ownership. The segment needed to traverse a creek and hilly terrain across the privately owned Magee property, and nobody could build a public trail across private land without a reason for that land to open up.
The opening came with approval of the 69-home Magee Preserve project, which dedicated 93 percent of the 410-acre ranch to public open space and trail development, with a condition requiring the developer to build the eastern segment inside the subdivision while the Town built the harder western segment on a dedicated public easement. The eastern portion would be relatively flat, while the western portion, built by the Town, would face the toughest conditions: creek crossings, steep slopes, and the trickiest possible spot to cross Diablo Road and tie into the existing Barbara Hale Trail.
Funding took almost as long as the negotiation. At the time of the Magee Preserve approval the Town had roughly half the money it needed. By summer 2021, given the trail's importance as a regional link, it secured the rest, and the project became fully funded. The final budget landed at $5.2 million, with $4.7 million coming through the Contra Costa Transportation Authority's Measure J Transportation Sales Tax fund.
Danville broke ground in October 2025, more than three decades after the idea first appeared on a town map.
"Over 36 years ago, we were standing here, envisioning this trail. Over the years, local leaders, residents, and partner organizations have worked together to turn that early idea into today's reality. This trail represents connection, access, and preservation, values that define the Danville community and our County." — Danville Mayor Renee Morgan, at the October 2025 groundbreaking
The Birds Got There First
Here is the part that does not make it into the press releases. Construction began in early March 2026 and experienced delays tied to two factors: environmental compliance measures for nesting birds, and the need to relocate utility guy wires within the construction footprint. Town staff spent May securing permitting approval from the California Department of Fish and Wildlife once the birds fledged, while coordinating with PG&E on relocating the guy wires. Wall construction inside the creek bed could not resume until those wires were moved, a target the Town set for just before June 15.
That is when the phase most people have actually noticed began. Construction entered a new phase on June 15, with wall work near the creek between Fairway Drive and Alameda Diablo, running weekdays with traffic control from 7 a.m. to as late as 6 p.m., and one-way control along Diablo Road between Clydesdale Drive and Alameda Diablo. The original plan called for that phase to wrap by mid-September. As of this month, it hasn't. The largest and most impactful phase, placement of large retaining walls adjacent to Green Valley Creek, is now expected to continue through approximately October 15, requiring daytime traffic control on Diablo Road between Fairway Drive and Alameda Diablo. Vehicles entering from Calle Arroyo are also being controlled as part of the operation, and motorists should expect delays during morning and afternoon commutes, particularly during school drop-off and pick-up.
Once the wall work clears, the project isn't finished, just further along. The full Diablo Road Multimodal Trail and Drainage Improvements Project, known internally as CIP C-055, includes the final 0.9-mile section of a 2.1-mile, 8-foot-wide paved Class 1 multi-use trail along the southern shoulder of Diablo Road, improving connections between Green Valley Road and Blackhawk Road and expanding access to Mount Diablo State Park, with construction expected to continue in phases through December 2026. A new feature is part of the package too: a new HAWK signal, a high-intensity activated crosswalk, at Diablo Road and Fairway Drive that will let trail users stop traffic on demand.
| Phase | Window | What's happening |
|---|---|---|
| Fencing and site prep | 2025 | Old fencing removed, construction fencing installed, minimal traffic impact |
| Creek and wall construction | March–October 2026 | Retaining walls near Green Valley Creek, one-lane alternating traffic between Fairway Drive and Alameda Diablo, extended from a mid-September target to roughly October 15 |
| Winter pause | November–March | Work paused to avoid the rainy season |
| Final connections and paving | Through December 2026 | New HAWK signal at Fairway Drive, remaining trail sections tied into Barbara Hale Trail |
A Clubhouse That Took Its Time Too
The same pace shows up just up the road at Diablo Country Club, and it is worth understanding if you live anywhere near it, because club life is a good chunk of daily life here. The club has spent the better part of a decade on its own multi-phase overhaul, and it treated speed the same way the Town treated the trail: as a lower priority than getting it right.
An award-winning $12 million golf course renovation, completed in 2020, restored the look and feel of the century-old course, paying homage to the original design by Jack Neville and William Watson, the architects behind Pebble Beach and the Olympic Club. Members approved a second phase, a $22 million clubhouse and campus project fully funded through capital dues rather than assessments, targeting a historic clubhouse structure built roughly 140 years ago. Groundbreaking on that phase came in July 2023. The doors reopened in June 2024.
The Clubhouse reopening in June 2024 capped a comprehensive multiyear facilities update, with a grand reopening celebration on June 1 drawing more than 700 members and guests. Add the two phases together and the club had put roughly $41 million into the ground over about six years.
What it did not do is modernize the building past recognition.
"Our enhancements feel updated and relevant, but not overly modernized. Diablo still feels like a club, not a hotel. This is a place with soul." — Bruce Pruitt, Diablo Country Club General Manager and Chief Operating Officer
"The golf course renovations and resulting accolades served as a tangible 'North Star' to guide Diablo's other enhancements and updates," DCC Board President Tim Pauling said. "What the Clubhouse renovation really represents is an opportunity for members to not only reconnect but also shape the Club's future, together."
The new spaces are real, not cosmetic touches:
- A revitalized Red Horse, the club's main dining and social hub, paired with the new Mt. Diablo Pub, a 21-and-older space the club describes as unique among East Bay clubs
- An expanded main kitchen with more space and equipment, including a new Chef's Table for private gatherings
- An expanded pro shop and an indoor hitting simulator for year-round play
- A new fitness center, renovated tennis pavilion and childcare center, and new permanent bocce ball courts
Blake Pedersen, the club's wine consultant, put it plainly at the reopening: the offerings are things you are not going to find at your favorite restaurant down the street. That is the same instinct running through the trail project up the road. Diablo does not rush its infrastructure, public or private, and it does not pretend that rushing would make either one better.
What This Means If You're Driving Diablo Road This Fall
If you have somewhere to be on the other side of that work zone, plan around it rather than through it. Expect single-lane alternating traffic near Green Valley Creek through roughly mid-October, with Calle Arroyo entries controlled as part of the same operation. Mornings and afternoons around school pickup are the tightest windows. Once the wall work clears, the project moves into the section that ties the new pavement into the existing Barbara Hale Trail, with a scheduled pause from November through March before the last connections and the new signal at Fairway Drive get finished.
The Town's target for full completion is December 2026. Given that this same project has already stretched a September deadline into October once this year, a little skepticism about that date is reasonable. For anyone who wants the current word rather than last month's, danvilletowntalks.org posts updates directly from the project team.
None of this is really about a road. It is about what gets protected, and what doesn't, when a small community decides something is worth doing properly. The trail preserves a creek corridor and a nesting habitat that could have been graded through in a season if anyone had been in a hurry. The clubhouse preserved a 140-year-old structure instead of tearing it down for something easier to build fast. Diablo has always run on its own clock. This year just makes it easier to see.
If you're weighing what life actually looks like day to day in Diablo, from the country club calendar to the trail network taking shape around it, we put together a broader look at what buyers should know about living around Diablo Country Club that covers the basics beyond this year's construction.
Whether you're already inside the gates or just keeping an eye on this corner of Contra Costa County, Kory Madge has spent decades watching how Danville, Alamo, and Diablo actually change, one trail and one clubhouse at a time. If you're curious what any of that means for your own property, her team's instant home valuation tool is a good place to start the conversation.
