Two Construction Projects Are Running At The Lafayette Reservoir Right Now, And Most Regulars Haven't Noticed

Walk the Lakeside Nature Trail this month and the loop feels exactly like it always has. Dogs on leashes, joggers counting mile markers, the same wide paved path curling around the water under the oaks. Look toward the dam, though, and something is different. The outlet tower that has stood at the same height for decades is visibly shorter than it was in June.

That tower is in the middle of a $14 million seismic retrofit. At the same time, a second, unrelated project is reworking part of the reservoir's wastewater collection system. Both are active right now, both are scheduled to keep going through the fall, and neither has closed the park to the public. That combination, two capital projects running at once with almost no visible disruption to the everyday visitor, is worth understanding if you use this reservoir the way most Lafayette residents do: as a Tuesday-morning habit rather than a place you think about.

What Happened To The Tower

Crews began physically shortening the tower in early July. The work started with removing the existing operating house at the top, then taking down 13 concrete rings from the tower stem itself. That phase was on schedule to bring the tower to its new, permanently shorter height by August 21, a target date that's already come and gone by the time you're reading this.

From here, the sequence gets more specific than most people would guess. Before EBMUD can install the new metal operating house, crews first have to build new corbels and pour a new floor inside the existing tower structure. That interior work is what's happening right now. The new operating house itself is targeted for completion by November 2026.

Here's the part that surprised me: the tower being visually finished this fall doesn't mean the project is done. The last piece, new underwater slide gates and their electric motor operators, has to wait for the next permitted construction window because the current environmental work window closes later this fall. That work resumes in spring 2027. EBMUD's own timeline puts the tower at full operational status only by fall 2027, a full year after most passersby will assume the construction is over.

A Second Project, Same Stretch Of Trail

Running alongside the tower work is a separate Wastewater Collection System Improvements project, also active through fall 2026. EBMUD and the Lafayette Chamber have grouped updates on both projects together because their footprints overlap: most of the noise and equipment activity from either job clusters around the Lakeside Nature Trail and the barge ramp area near the dam, not the Rim Trail or the far side of the loop.

If you're on the paved trail near that stretch, you may see crews moving equipment or materials directly across the path to reach the park's exit road. Flaggers are stationed at the main entrance gate and along the trail as needed, and the honest expectation set by the Chamber is occasional 10 to 15 minute delays for pedestrians and vehicles, not trail closures.

Why You Haven't Noticed

The detail that tells you the most about how this is being managed is where the debris goes. Demolition material from the tower shortening gets brought to shore, loaded onto trucks, and hauled out through the Acalanes Road onramp specifically to avoid downtown Lafayette. There are no planned vehicular closures tied to the tower project at all. The disruption that does exist is being engineered around the park experience rather than through it.

That's not an accident of good contractor manners. It's a function of what this reservoir actually is. It was built in 1933 as an EBMUD terminal storage reservoir, holding roughly 1.4 billion gallons across a property of about 925 acres. It wasn't opened to public recreation until 1966. Today it draws close to a million visitors a year for walking, fishing, and picnicking, but it is not currently used for drinking water. It's held in reserve as an emergency supply. A seismic retrofit on the outlet tower isn't cosmetic work on a scenic amenity. It's earthquake-resilience work on a piece of regional water infrastructure that happens to double as one of the most-used parks in Lamorinda. Keeping the park functional during the repair is the second priority. Keeping the tower ready for its actual job is the first.

Planning A Visit Around What's Still The Same

Almost everything else about the reservoir experience hasn't shifted at all this year.

Hours still swing by season more than most casual visitors realize. January runs 6:30 a.m. to 5:30 p.m., while June and July stretch to 6 a.m. to 9 p.m., nearly four extra hours of daylight access at the height of summer. December closes back down to the same 6:30-to-5:30 window as January.

• Parking runs $7 for the day or $1 per half hour at the metered short-term spots, with a two-hour maximum on meters. Annual passes are $140, or $90 for seniors and visitors with disabilities age 62 and up.
• Row boats and pedal boats rent first-come, first-served from opening until 4 p.m., with a $40 deposit and an 18-and-up rule to rent. All boats have to be docked by 5 p.m., and personal hand-launch boats need a $4 one-day launch fee plus a $6 invasive mussel inspection fee, good for 30 days, before they touch the water.
• Fishing runs on a state license plus an EBMUD Fishing Access Permit, purchased at the Visitor Center. EBMUD stocks trout from November through March, alongside a resident population of catfish, bass, and sunfish.
• Bikes, roller skates, and scooters are allowed on the paved Lakeside Trail only on Tuesday and Thursday afternoons and Sunday mornings until noon, otherwise the paved loop stays foot traffic only.
• There are 35 picnic sites scattered around the reservoir, most concentrated near the dam, with some reservable in advance through the Visitor Center for a prepaid fee. Open fires and barbecues are only allowed in those developed picnic areas.
• Dogs are welcome on leashes no longer than six feet, on-leash at all times.

None of that changed because of the construction. If your routine at the reservoir is a Saturday picnic and a lap around the paved loop, the two active projects are unlikely to touch your morning at all.

The One Day The Loop Actually Closes

The exception is a single Sunday that has nothing to do with construction. The Lafayette Res Run for Education returns on October 18, 2026, co-sponsored by the Lafayette Chamber and the City of Lafayette. Race day starts with the 5K at 8 a.m., the 10K at 8:15, and a 2-mile run and walk at 8:45, all based out of downtown Lafayette.

In the week leading up to it, from October 10 through 17, the reservoir hosts the Reservoir Challenge, a virtual race where participants can walk or run the 2.7-mile paved loop on their own schedule and log their time. That option disappears on race day itself, when the reservoir closes to Challenge participants because the 10K course runs through the park. It's a small, specific trade-off: you get a full week of flexible access to the loop, but the one morning it's actually a race, the loop belongs to the runners.

The event has real local weight behind it. In 2025, it returned a total of $37,611.32 to local schools through registration proceeds, split among elementary, middle, and high schools across the district. Race packets are picked up in person at the Lafayette Chamber office at 251 Lafayette Circle, the same building that's been the event's home base for years.

What This Adds Up To

The reservoir most Lafayette residents describe when asked about it, the loop, the trout, the picnic tables near the dam, hasn't moved. What's changed is underneath and around it: a tower getting rebuilt for an earthquake that hasn't happened yet, a wastewater system getting upgraded on the same schedule, and a construction team routing debris trucks the long way specifically so downtown traffic never feels it. If you've walked past that shortened tower this summer and wondered what was going on, now you know exactly what, and exactly how long it's going to take to finish properly.

If you're weighing a move into a neighborhood where a reservoir retrofit counts as local news worth tracking, that's the kind of texture you only get from people who actually live here. Jeff Snell has been part of the Lamorinda community for the long haul, and a home valuation or a market conversation is a good place to start if Lafayette is on your list.