Walk the paved loop at Lafayette Reservoir this month and the skyline over the water looks wrong in a way that's hard to place at first. The tower that has watched over the lake since 1929, the one every regular walker, runner, and rowboat renter has used as a landmark for decades, lost its familiar silhouette sometime around August 21. Crews shaved 40 feet off a structure that stood 170 feet tall, and the operating house that used to cap it is gone, replaced for now by open framing and scaffolding.
The story locals are telling each other is that a beloved piece of Lafayette is disappearing. The more accurate story, and the one that actually explains why this is happening in 2026 and not sooner, is that the tower was never built to the size the reservoir needed in the first place. What's coming down this year isn't a landmark being sacrificed. It's a century-old measuring error finally being corrected.
A Tower Built for a Reservoir That Never Existed
When construction on the Lafayette Reservoir began in 1927, the original plan called for a dam roughly 33 feet taller than the one that exists today, according to the East Bay Municipal Utility District. A dam that size would have held nearly three times the water. But the earth-filled embankment couldn't support that height as crews built it. The soil began to move, and engineers scaled the dam back to protect the project.
The outlet tower, though, had already gone up to match the bigger, taller reservoir that was originally on the drawing board. Nobody shortened it to match the smaller dam. For nearly a century, Lafayette has been looking at a tower sized for a lake that was never actually built, standing about 40 feet taller than the finished reservoir ever required.
That mismatch is the reason for this year's work. EBMUD isn't altering a design choice residents made peace with generations ago. It's finishing a correction that got skipped in 1929.
Why the Cut Is Happening Now
The trigger wasn't aesthetic. After the 2017 Oroville Dam crisis, which forced the evacuation of 188,000 people, the California Division of Safety of Dams tightened its seismic standards statewide. Reviews of the Lafayette tower found that its extra, unnecessary height made it more likely to crack or fail in a major earthquake, which could compromise the spillway and send water downstream toward Lafayette and Walnut Creek.
The fix, approved by DSOD, is a $14 million project funded by EBMUD ratepayers: shorten the tower to the height the reservoir actually needs, reinforce the outlet conduits beneath the dam, and rebuild a new metal operating house designed to echo the look of the original. EBMUD has said it's preserving elements of the century-old structure where it can, including salvaging a window from the 1920s original, and the agency has floated the idea of turning leftover pieces of the old tower into some kind of commemorative token for the community once a formal plan comes together.
What Actually Changes on Your Saturday Loop
Here's the part that matters most if you use the reservoir the way most Lafayette residents do, which is on evenings and weekends. It's mostly business as usual.
EBMUD has structured the entire project around avoiding disruption to the recreation area's busiest hours. Work is limited to weekdays. There are no planned vehicular closures tied to the tower project itself, and the reservoir hasn't shut its gates to visitors during this phase. What you will notice is intermittent flagging at the park entrance and along the Lakeside Nature Trail, where crews occasionally move equipment across the path to reach the exit road, and that can mean a 10 to 15 minute wait for pedestrians or cars at certain points in the day.
The haul route for debris is deliberately routed around downtown. Trucks carrying material off the tower site use the Acalanes Road on-ramp to Highway 24 exclusively, so none of that traffic passes through Mt. Diablo Boulevard or the commercial core.
A second, separate project is running at the same time. EBMUD is also replacing the aging wastewater collection system serving the recreation area, a job that started in fall 2025 and continues through fall 2026, concentrated near the Lakeside Nature Trail and the barge ramp used for the tower work. The two projects overlapping is why construction noise has felt near-constant this year even on days when the tower itself looks quiet.
The Fall Calendar Didn't Move for Any of This
If you're wondering whether the reservoir's biggest annual event got pushed because of the construction, it didn't. The Lafayette Res Run for Education is still set for Sunday, October 18, with the 5K starting at 8 a.m., the 10K at 8:15, and the 2-mile fun run at 8:45, all in downtown Lafayette. The Reservoir Challenge, a virtual option that lets participants log a lap of the 2.7-mile paved Lakeside Nature Trail on their own schedule, runs October 10 through 17. On race day itself, the reservoir loop is reserved for 10K runners, so the Reservoir Challenge isn't an option that Sunday.
The run has become one of the more concrete ways the reservoir supports the rest of the community. Last year's race distributed a total of $37,611.32 back to Lafayette schools based on registration numbers, with Burton Valley Elementary and Happy Valley Elementary topping the fundraising totals. Participating schools also earn a voucher for bulk candy from Zoonie's Candy Shop, a small, very Lafayette detail that's stuck around since the race's earlier years. The event is organized jointly by the Lafayette Chamber of Commerce and the City of Lafayette, and it's proceeding on its usual third-Sunday-in-October schedule regardless of what's happening at the tower a quarter mile away.
What's Left Before This Is Actually Finished
The tower reaching its new height in August was a milestone, not a finish line. Here's the sequence still ahead:
- Now through November 2026: Crews build new corbels and a floor inside the shortened tower, then install the new metal operating house on top.
- Late fall 2026: The seasonal environmental work window closes, and work on the tower components pauses for the year.
- Spring 2027: Crews return to install new underwater slide gates and electric motor operators, work that has to happen during a permitted seasonal window tied to fish and wildlife protections in the reservoir.
- Fall 2027: The tower is expected to return to full operational status, roughly a year after this summer's visible cut.
Picnic reservations, which EBMUD suspended between February and July of this year because of the construction footprint, are being reopened selectively as the schedule firms up. Sites away from the active work areas remain available on a first-come, first-served basis in the meantime.
The Version That Was Always Supposed to Be There
There's something worth sitting with here that has nothing to do with nostalgia. The tower Lafayette has photographed, painted, and used as a turnaround point for a hundred years was, in a very literal sense, a mistake nobody got around to fixing. The version arriving by 2027 isn't a diminished replacement. It's the one the original engineers would have built if the ground beneath the dam had cooperated in 1929.
That's a strange thing to realize about a landmark you've circled hundreds of times without ever questioning its shape. It's also a decent reminder that even the most familiar fixtures of a neighborhood have histories worth knowing, not just views worth admiring.
If you're the kind of person who wants to understand Lafayette at this level of detail, whether it's a reservoir tower's engineering history or what's actually happening on a street you're thinking about calling home, that's the kind of local knowledge The Beaubelle Group works from every day. If you're weighing a move into Lamorinda and want a conversation grounded in specifics rather than generalities, reach out and request a complimentary home valuation to start.
