Say you keep a paddleboard in the garage in Redwood Estates or Lexington Hills, the kind of thing that gets strapped to the roof rack most Saturdays between May and October for the fifteen-minute drive down to Lexington Reservoir. You've made that drive dozens of times. You know the switchback on Alma Bridge Road, you know which end of the parking area fills up first, you know the water gets choppy by early afternoon when the wind picks up off the ridge. None of that changes this fall. What changes is what happens the moment you try to put the board in the water.
Starting Monday, September 14, 2026, Santa Clara County Parks is putting a new rule into effect at every reservoir it manages, Lexington included: any vessel that shows up without an approved band or seal goes into a mandatory 30-day quarantine from the date it arrives, and that applies even if the boat has never left Santa Clara County. The county isn't drawing a line between visitors and locals here. A kayak that's lived in a Redwood Estates garage since 2019 gets treated exactly like one that just drove in from out of state, unless it's already banded. That's the detail worth sitting with before you assume this fall looks like every other fall.
The Rule That Doesn't Grade on Local Loyalty
The change is part of a joint effort between the county and Valley Water to keep golden mussels out of local reservoirs, a species that's shown up elsewhere in California waterways and spreads through exactly the kind of small standing water that hides in a kayak hull or a paddleboard fin box. The county's response is the same protocol lakes across the state have adopted: clean, drain, dry, then inspect. Only limited-power, hand-launched vessels are allowed on Lexington to begin with, canoes, kayaks, float tubes, SUPs, and electric motors of five horsepower or less, and every one of them has to pass inspection before it touches the water.
Here's the mechanism that actually matters for someone who paddles regularly: once your vessel passes inspection, the county can apply what's called an exit band, a tamper-evident seal that's logged against your vehicle's plate or CF number. A properly sealed boat can skip the inspection line on the next visit. Break the seal, or show up without one, and you're back in the 30-day queue.
| Before September 14, 2026 | Starting September 14, 2026 | |
|---|---|---|
| Unbanded vessel, clean and dry | Passes inspection, launches same day | 30-day quarantine from arrival date, regardless of registration county |
| Vessel with valid exit band | Skips inspection, launches same day | Skips inspection, launches same day |
If you're planning to be on the water this fall, the move is to get your boat banded before the 14th, not after. Waiting until the rule is already in effect to find out you need one means losing a month of paddling season over a piece of paperwork that takes minutes to sort out ahead of time.
The Other Access Point on the Same Road Is Also Mid-Change
Drive the other direction on that same stretch near Highway 17 and there's a second, unrelated change already underway. Bear Creek Redwoods Open Space Preserve, the 1,432-acre stretch of second-growth redwood and oak woodland that sits just across the highway from the reservoir, has several trails closed right now for construction:
- Toad Hollow Trail
- Myotis Trail
- Lower Pete Siemens Trail
- portions of Beaver and Oak Knoll trails
The Midpeninsula Regional Open Space District is using the closure to build a new parking area and an easy-access loop trail, and the preserve's own page puts the reopening at September 2026, meaning the same month the reservoir's quarantine rule lands is also the month this construction is supposed to wrap.
Context helps here. The land was nearly turned into a golf course and country club with luxury homes before Midpen and the Peninsula Open Space Trust stepped in and protected it in 1999. Before that, it had been logged in the 1850s, briefly run as a fish farm, then developed into a self-sufficient estate that passed between a couple of California's wealthiest families before the Jesuit order took over the buildings to run Alma College, the first Jesuit school of theology on the West Coast. The first 500 acres, west of Bear Creek Road, opened to the public in June 2019 with six miles of trails and a 52-space lot. The current construction phase, which includes the former college buildings and stables, is slated to finish sometime between 2020 and 2026. A third phase, east of Bear Creek Road and south of the old college site, won't open until after 2026, and when it does, it's supposed to add another 15 miles of trail, including a connector that crosses Highway 17 to link directly into Lexington Reservoir County Park.
Why Alma Bridge Road Is the Common Thread
That last detail is the reason this isn't two unrelated news items happening to land in the same month. The Alma Parking Area for Bear Creek Redwoods sits directly opposite Lexington Reservoir off Bear Creek Road, close enough that the county park's own boat launch and the preserve's trailhead are functionally the same neighborhood errand. Once Phase 3 finishes construction, that proximity becomes an actual trail connection instead of just a shared exit off Highway 17. What looks this September like two agencies independently finishing their own projects is really the early shape of one connected recreation corridor for the pocket of the mountain that includes Redwood Estates, Lexington Hills, and Chemeketa Park.
For now, the practical reality is simpler. If your usual Saturday loop involves parking at Alma, walking a stretch of Bear Creek Redwoods, then driving the half mile over to put a kayak in at the reservoir, you're touching two separate sets of rules in one outing this fall, one closed until construction finishes, one requiring a banded vessel before you're allowed to launch.
What to Actually Do Before You Head Down the Hill
A few things worth handling before your next trip rather than finding out at the gate:
If you're boating at all this season, get your vessel banded before September 14. The county's inspection stations do close midday, typically between 11 a.m. and 1 p.m., so plan around that window rather than showing up expecting an inspector to be there.
If Bear Creek Redwoods is part of your usual route, call the trail hotline at (408) 355-2200 and press 38 before you drive down, since closures tied to active construction can shift week to week.
And if you're heading out early and need supplies before either stop, the Redwood Estates Store on Broadway is still the last real grocery stop on the way down the hill, stocked with the kind of produce, cured meats, and craft beer selection that makes it worth the two minutes off Highway 17 rather than showing up with nothing.
None of this changes why people live up here. The reservoir and the preserve are still going to be the two anchors of a weekend on this part of the mountain. They're just anchors that are, for one September, both mid-transition at the same time, on the same road, for reasons that have more to do with mussels and construction schedules than with each other. Knowing that before you load the car saves you a wasted trip.
If you're weighing a move to this stretch of the Santa Cruz Mountains, or you already own here and have questions about how a property along Alma Bridge Road, in Redwood Estates, or up in Lexington Hills actually functions day to day, Daniel Oster has spent years working this exact corridor and knows it past the trailhead signs. Let's Connect.
