Walk the paved loop around Spring Lake this weekend and it feels like one unbroken stretch of nature. Redwood shade, joggers, a leashed dog trotting along the shoulder. Keep going past the Canyon Trail junction and the gravel underfoot doesn't change, but the rules governing it do completely. You've left a county park built to hold floodwater and walked straight into a state park where a draft plan proposes making the hike to a granite lookout called Henry's Knob an official trail.
Most people who live near this loop treat Spring Lake Regional Park and Trione-Annadel State Park as a single trail system, because physically they are. One map bleeds into the other at a junction most walkers never notice. But the two agencies running them are on entirely different clocks, one built around annual dates, the other shaped by a trail-planning process. This particular week, you can see both timelines side by side.
The county side runs on a schedule you can circle in advance
Labor Day fell on September 7 this year, and that date marked the seasonal shift on the Spring Lake side of the boundary. The swimming lagoon and its inflatable Water Park had been running summer hours, weekdays from 3 to 7pm and weekends from 11am to 7pm, and that schedule ended when the holiday weekend closed out. Boat, kayak and paddleboard rentals at the Violetti Road entrance followed the same clock. After Labor Day, the only way to launch your own boat is the free, year-round ramp at the Newanga Avenue entrance, and only electric motors are allowed on the water regardless of the season.
Two weeks after that, the calendar flips again. The Sonoma County Parks Foundation runs Water Bark, a fundraiser that turns the no-dogs-allowed swimming lagoon into the one place in the park where dogs are the entire point, before the lagoon gets drained for the year. This year that's three specific weekends: September 19 and 20, September 26 and 27, and October 3 and 4. It's the single stretch of the year when the sign banning dogs at the lagoon gets reversed on purpose. The campground on the Newanga side closes out its regular season a few weeks later, on September 30.
None of this requires checking a website every week. It happens the same way, on close to the same dates, most years. That's what a county-run recreation park looks like when the agency running it answers to a parks department with a maintenance budget and a fiscal calendar.
The state side follows a planning process
Cross onto Trione-Annadel and the rules and schedules change. The park covers more than 5,000 acres and holds 45 miles of official trail, plus another 40 miles of unofficial routes worn in over decades by hikers, mountain bikers and horses who wanted a shorter or prettier way through. State Parks estimates the park absorbs roughly 13,000 visitors a month.
Earlier this year, California State Parks completed a Public Draft of its Road and Trail Management Plan for Annadel, and the Press Democrat's February coverage laid out exactly what's on the table. The plan would legalize the hike to Henry's Knob, a 1,525-foot outcrop that regulars call The Boob and have been visiting for years despite it never being an official trail. It proposes separating hikers from mountain bikers at some of the most congested junctions, including where Canyon Trail meets Rough-Go. And it calls for repairing sections of the Cobblestone Trail where years of use have stripped the surface down to exposed rock and root, ground that was quarried more than a century ago and shipped out to pave streets in San Francisco. Planners are also weighing digital kiosks at trailheads to start collecting a day-use fee from visitors who currently walk in without paying one.
State Parks' own planning page had listed August as the target for the next step, a Proposed Draft incorporating public comment. If you've hiked Annadel recently and nothing looked different, that's not because nothing happened. State trail planning moves through drafts and comment periods, and the next visible sign of change on the ground, if the plan clears review, would be construction flagging near Canyon and Rough-Go.
The line you cross without a sign
The reason any of this matters on a Tuesday evening walk is that the boundary between the two parks doesn't announce itself, but the rulebook flips the moment you cross it. Bring a leashed dog and the Spring Lake Loop Trail is fine. Keep walking into Trione-Annadel with that same dog on that same leash and you're now out of compliance. State rules confine dogs to paved areas like the visitor center lot and Channel Drive. They are not allowed on any trail or in the backcountry, full stop.
State rules also classify electric-assist bikes as motorized vehicles rather than bicycles, and motorized vehicles are barred from Annadel's trail system, regardless of how much the motor assists. This restriction applies on Annadel's trails once you leave Spring Lake's pavement.
| Spring Lake (county) | Trione-Annadel (state) | |
|---|---|---|
| Managed by | Sonoma County Regional Parks | California State Parks |
| Dogs on trail | Allowed on leash | Not allowed, paved areas only |
| Bicycles | Paved loop open to cyclists | Multi-use trails only, e-bikes barred |
| Day-use fee | $8 to $10 per vehicle, by season | $8 per vehicle |
| Shared access point | Canyon Trail | Canyon Trail |
The dollar difference is small, but the fee and schedule details are worth keeping straight as you cross between the two parks.
What actually changes if you're on this loop in the coming weeks
- The swimming lagoon and Water Park closed for the season at the end of the Labor Day weekend, September 7.
- Boat, kayak and paddleboard rentals at Violetti Road ended on Labor Day. Only the year-round Newanga Avenue ramp stays open after that, electric motors only.
- Water Bark opens the lagoon to dogs for three weekends: September 19-20, September 26-27, and October 3-4, before the lagoon is drained for the year.
- The Spring Lake campground's regular season runs through September 30.
- Nothing on the Annadel side closes on a fixed date, but watch for flagging, temporary reroutes, or new signage near the Canyon and Rough-Go junction if the state advances from Public Draft to Proposed Draft this fall.
- Henry's Knob remains technically off the official trail system until the plan is formally adopted, whatever the well-worn path up to it suggests.
None of this changes a deed or a property line. But it says something true about how this edge of Santa Rosa actually functions day to day: two agencies, two funding models, two entirely different decision timelines, sharing one unmarked gravel junction. If your daily walk, run or dog outing touches both sides of that line, you're living next to two agency timelines at once, one tied to seasonal recreation and the other to a trail plan moving through public comment. Worth knowing which one you're standing in before you let the leash go slack.
If you're weighing what it actually means to live near this corner of Santa Rosa, close enough to hear both clocks ticking, HavenHous knows this ground the way a local does, not the way a listing sheet does. Schedule a personalized consultation and let's talk about what a home near Spring Lake or the Annadel side of Channel Drive actually looks like to live with, season after season.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
