Dumbarton Bridge Toll 2026
The Route 84 (SR-84) toll is $8.50 for every payment method in 2026. Carpool $4.25 during weekday commute hours. The shortest crossing of San Francisco Bay, linking Fremont to Menlo Park. Tolls westbound only.
Dumbarton Bridge (Route 84) Toll Fee
A passenger car pays $8.50 westbound, the same whether you use FasTrak or pay-by-plate. Carpools of 3+ pay $4.25 during commute hours.
Dumbarton Bridge Carpool Hours
The carpool discount runs weekdays 5:00-10:00 AM and 3:00-7:00 PM. Outside those windows, every vehicle pays the standard toll.
To qualify for the $4.25 carpool rate you need all three:
- 1. 3 or more occupants in the vehicle (uniform at all seven state-owned bridges since January 1, 2026; it was previously 2+ here)
- 2. A FasTrak Flex transponder set to position 3 before you reach the plaza
- 3. The designated carpool lane during the weekday discount hours
Two-occupant vehicles with a Flex tag set to position 2 may use the carpool approach lane to skip the queue, but pay the full $8.50. See the carpool guide for how FasTrak Flex positions work.
Dumbarton Bridge at a Glance
2026 Dumbarton Bridge Toll Rates
Westbound only, at the plaza on the Fremont side. BATA schedule effective January 1, 2026, verified June 2026. Source: bayareafastrak.org.
| Payment Method | Passenger Car | Notes |
|---|---|---|
| FasTrak (standard) | $8.50 | Same price as pay-by-plate until January 2027, when FasTrak becomes $9.00 vs $9.25 plate. |
| Pay-by-plate | $8.50 | License plate captured, bill mailed to registered owner. |
| Carpool (FasTrak Flex 3+) | $4.25 | Transponder set to position 3, three or more occupants, weekdays 5-10 AM and 3-7 PM. |
| Cash | Not accepted | All Bay Area toll bridges have been fully electronic since 2020. |
| Out-of-state E-ZPass / SunPass | Not accepted | Will be billed at pay-by-plate rate. |
About the Dumbarton Bridge
The Dumbarton Bridge carries State Route 84 across the southern end of San Francisco Bay, linking Fremont in the East Bay (near I-880) with Menlo Park on the Peninsula (near US-101). At 1.63 miles it is the shortest bridge across the Bay, and it is the southernmost vehicle crossing. The current span opened in October 1982, replacing the original 1927 Dumbarton Bridge, which was the first vehicular bridge ever built across San Francisco Bay.
It is a key crossing for Silicon Valley commuters moving between the East Bay and the job centers of the Peninsula, carrying over 70,000 vehicles on a typical day. The toll plaza sits at the east end on the Fremont side and charges westbound traffic only; eastbound trips back toward Fremont are free.
The bridge is operated by the Bay Area Toll Authority (BATA), which runs all seven state-owned Bay Area toll bridges on a single toll schedule: $8.50 for a two-axle vehicle in 2026, rising in annual steps thereafter, with payment-method pricing beginning January 1, 2027.
How Dumbarton Compares
| Bridge | FasTrak | Pay-by-Plate | Carpool |
|---|---|---|---|
| Dumbarton (SR-84, you are here) | $8.50 | $8.50 | $4.25 (3+) |
| San Mateo (SR-92) | $8.50 | $8.50 | $4.25 (3+) |
| Bay Bridge | $8.50 | $8.50 | $4.25 (3+) |
| Richmond-San Rafael | $8.50 | $8.50 | $4.25 (3+) |
| Carquinez | $8.50 | $8.50 | $4.25 (3+) |
| Benicia-Martinez | $8.50 | $8.50 | $4.25 (3+) |
| Antioch (SR-160) | $8.50 | $8.50 | $4.25 (3+) |
| Golden Gate | $10.25 | $10.50 | $8.25 (3+) |
See the full Bay Area bridges overview, the San Mateo Bridge detail page, or the Antioch Bridge detail page. Planning a multi-bridge trip? The Bay Area Trip Builder totals your route across all eight bridges.
Dumbarton Bridge FAQ
How much is the Dumbarton Bridge toll in 2026?
The Dumbarton Bridge (State Route 84) toll for a passenger car is $8.50 since January 1, 2026, the same price whether you pay with FasTrak or pay-by-plate. Payment methods only get different prices from January 2027, when FasTrak becomes $9.00 versus $9.25 for a license plate account and $10.00 by invoice. Tolls are collected westbound only, toward Menlo Park; eastbound crossings back toward Fremont are free.
What are the Dumbarton Bridge carpool hours?
Carpool hours on the Dumbarton Bridge are weekdays from 5:00 AM to 10:00 AM and 3:00 PM to 7:00 PM. During those windows, vehicles with 3 or more occupants pay $4.25 (half the standard $8.50 toll) using a FasTrak Flex transponder set to position 3 and the designated carpool lane. Outside those hours, everyone pays the standard toll. The 3-occupant requirement has applied at all seven state-owned Bay Area bridges since January 1, 2026.
Can 2-person carpools use the Dumbarton Bridge carpool lane?
Two-occupant vehicles with a FasTrak Flex tag set to position 2 may use the carpool approach lane at the Dumbarton Bridge to bypass the toll plaza queue, but they do not receive the carpool discount; they pay the full $8.50. The half-price $4.25 rate requires 3 or more occupants. This two-occupant lane-access rule applies at six of the seven state-owned bridges (the Bay Bridge excluded).
Where is the Dumbarton Bridge and what does it connect?
The Dumbarton Bridge carries State Route 84 across the southern end of San Francisco Bay, linking Fremont in the East Bay (near I-880) with Menlo Park on the Peninsula (near US-101). It is the southernmost vehicle crossing of the Bay and, at 1.63 miles, the shortest bridge across San Francisco Bay. It carries over 70,000 vehicles on a typical day and is heavily used by Silicon Valley commuters.
How old is the Dumbarton Bridge?
The current Dumbarton Bridge opened in October 1982. It replaced the original Dumbarton Bridge, which opened on January 17, 1927 and was the first vehicular bridge across San Francisco Bay. The toll plaza sits on the Fremont (east) side and charges westbound traffic only.
Can I avoid the Dumbarton Bridge toll?
The toll is collected only westbound, so eastbound trips toward Fremont are always free. To avoid the westbound toll entirely, the nearest alternative is the San Mateo-Hayward Bridge to the north, but it charges the same $8.50. The only true toll-free routing is around the southern end of the Bay through San Jose on US-101 or I-880, which adds substantial distance and time. For regular commuters, carpooling (3+ occupants, $4.25 during commute hours) is the realistic way to cut the cost.