East Fork Trailhead (Bridge to Nowhere)
Buy the pass before you leave town. The East Fork Day Use Parking Trailhead at the end of Camp Bonita Road needs an Adventure Pass ($5/day, $30/year, or an Interagency pass) and there is no vendor at the trailhead — the nearest Forest Service fee station is back down the canyon and weekends-only, cash only. The lot is open 24 hours with a vault toilet and no potable water, the Forest Service says flatly that space is limited, and hiker reports on summer weekends describe arrivals well before 8am.
The facts
- Trail served
- East Fork Trail — 5.5 mi each way to the Bridge to Nowhere, through the Sheep Mountain Wilderness; also Heaton Flats
- Cost / pass
- $5/vehicle/day or $30/year Adventure Pass; Interagency passes accepted
- Lot size
- Designated spaces only; the Forest Service publishes no count and says space is limited
- When it fills
- Summer and spring weekends: hiker reports describe arriving before 8am, some as early as 5:30am
- Overflow option
- Cars spill onto the approach road — a pass still has to be displayed, and USFS says don't block roadways, gates, or dumpsters
- Tow / citation risk
- Citations for unpassed vehicles and for blocking the road, gates, or the dumpster area
- Restrooms
- Yes
- Road to the lot
- Paved: SR-39 north from Azusa, right on East Fork Rd, then a sharp left on Camp Bonita Rd to the end
- Busy season
- Spring through fall — but never after rain; the route crosses the river repeatedly
Getting there
Camp Bonita Road, Azusa, CA 91702
Get directions →The pass is the trap
Almost everything about this trailhead is forgiving — open 24 hours, a vault toilet, a paved drive right to the end of Camp Bonita Road — except the one thing people leave to chance. An Adventure Pass or Interagency pass has to be on the dash, and nothing at the trailhead sells one. The Forest Service's San Gabriel Canyon Gateway Info Site / fee station at 15200 N San Gabriel Canyon Road in Azusa sells them, but it's weekends only, roughly 8am–4pm, cash. Miss that window and you're driving back to a sporting-goods store in the valley.
On spaces, we'll say what the Forest Service says and nothing more: parking is limited, park only in designated spots, and don't block roadways, gates, or dumpsters. No agency publishes a capacity number for this lot, so we won't invent one. What hikers consistently report is the shape of the problem — the designated spaces go early on warm weekends, and 5:30am arrivals are not unusual for the Bridge to Nowhere crowd.
The permit question, honestly
The Forest Service contradicts itself here and it's worth knowing before a ranger asks. The East Fork Trail page says a wilderness permit is required if you enter at the East Fork Trailhead. The East Fork Day Use Parking Trailhead page says a permit is encouraged but strictly voluntary at the same spot.
Either way it's free and it takes thirty seconds: self-register at the kiosk at the trailhead. Fill one out. It costs you nothing and resolves the disagreement in your favor. The San Gabriel Mountains National Monument office at (626) 335-1251 is the number if you want it settled definitively.
Plan B
There is no sanctioned overflow lot. When the designated spaces are gone, cars line the approach road — that still requires a displayed pass, and the Forest Service's own instruction is to keep roadways, gates, and the dumpster area clear. Blocking any of those is how a long river day ends with a citation.
The real plan B is temporal, not spatial: this is a hot, exposed, river-bottom hike that most people start at dawn anyway. Come on a weekday, or start before sunrise. If you arrive at 10am on a July Saturday to a full lot, the honest move is to drive twenty minutes to another canyon rather than circle. And skip it entirely after rain — the first three miles follow the streambed with repeated crossings, and swift water here has killed people.
Frequently asked questions
Do you need an Adventure Pass to park for the Bridge to Nowhere?
Yes. The East Fork Day Use Parking Trailhead is a Forest Service fee site: $5 per vehicle per day or $30 per year, or an America the Beautiful Interagency pass. Passes are not sold at the trailhead — buy one before you drive up.
Where can you buy an Adventure Pass near the East Fork trailhead?
The Forest Service's San Gabriel Canyon fee station at 15200 N San Gabriel Canyon Road in Azusa sells them, but it operates weekends only (roughly 8am–4pm) and is cash only. Otherwise buy online or from a valley vendor before you go.
Do you need a wilderness permit for the East Fork Trail?
Forest Service pages disagree — the trail page calls it required for entry at the East Fork Trailhead, the parking-area page calls it voluntary. It's free and self-issued at the trailhead kiosk, so fill one out regardless.
What time does the East Fork trailhead parking fill up?
The lot is open 24 hours, but hiker reports on warm-season weekends describe designated spaces filling before 8am, with some arriving around 5:30am. Weekdays are dramatically easier.
Facts on this page last verified July 20, 2026. Fees, hours, and access rules change seasonally — confirm with the official source before a long drive.