San Mateo County, CA

393 public highway bridges

San Mateo County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, San Mateo County, California contains 393 public highway bridges. Roughly 16.3% are rated “Good,” 31.3% “Fair,” and 5.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

393
Total Bridges
16.3%
Good
31.3%
Fair
5.3%
Poor Condition

Condition Distribution

Good
16.3% (64)
Fair
31.3% (123)
Poor
5.3% (21)

All Bridges (393)

BROADWAY ON-RAMP

Good

Over: U.S. HIGHWAY 101

04-SM-101-16.58-BURL, San Mateo, CA

Built 2017 Load: 32.4 t ADT: 3,500

VERDI ROAD

Good

Over: PURISMA CREEK

0.1 MI S PURISMA CRK RD, San Mateo, CA

Built 1987 Load: 32.4 t ADT: 63

LOBITOS CREEK ROAD

Good

Over: LOBITOS CREEK

1.1 MI N/W VERDE RD, San Mateo, CA

Built 1991 Load: 32.4 t ADT: 73

MARINERS ISL BLVD

Good

Over: BRANCH MARINA LAGOON

0.1 MI W/O TILLER DR, San Mateo, CA

Built 1999 Load: 32.4 t ADT: 2,970

PENNSYLVANIA,UP RR

Good

Over: REDWOOD CREEK

WEST OF MAPLE ST, San Mateo, CA

Built 1989 Load: 32.4 t ADT: 100

ROAD-1 SOUTH

Good

Over: PEDESTRIAN WALKWAY

TERMINAL 1 - AREA B, San Mateo, CA

Built 1964 Load: 32.4 t ADT: 12,930

ROAD-1 SOUTH

Good

Over: PEDESTRIAN WALKWAY

TERMINAL 3 - AREA E, San Mateo, CA

Built 1973 Load: 32.4 t ADT: 12,930

THIRD AVENUE

Good

Over: SAN MATEO CREEK

0.3 MI N NORFOLK ST, San Mateo, CA

Built 1986 Load: 32.4 t ADT: 12,040

PORTOLA RD

Good

Over: CORTE MADERA CREEK

0.1 MI E WILLOWBROOK DR, San Mateo, CA

Built 1989 Load: 32.4 t ADT: 4,000

MIDDLEFIELD RD

Good

Over: REDWOOD CREEK

WEST OF MAPLE ST, San Mateo, CA

Built 1989 Load: 32.4 t ADT: 14,000

LOS TRANCOS RD

Good

Over: LOS TRANCOS CREEK

1.5 MI S ALPINE RD, San Mateo, CA

Built 1989 Load: 32.4 t ADT: 2,700

SERVICE ROAD

Good

Over: GUADALUPE CHANNEL

BAYSHORE BLVD @ OLD CNTY, San Mateo, CA

Built 2007 Load: 32.4 t ADT: 4,646

SOUTH AIRPORT BLVD

Good

Over: SAN BRUNO CANAL

NORTH OF NORTH ACCESS RD, San Mateo, CA

Built 2018 Load: 32.4 t ADT: 19,327

ROAD- 1 SOUTH

Good

Over: PEDESTRIAN WALKWAY

TERMINAL 3 AREA G, San Mateo, CA

Built 2001 Load: 32.4 t ADT: 12,930

ROAD-1 SOUTH

Good

Over: PEDESTRIAN WALKWAY

TERMINAL 1 - AREA A, San Mateo, CA

Built 1973 Load: 35.3 t ADT: 12,930

ROAD-1 SOUTH

Good

Over: PEDESTRIAN WALKWAY

TERMINAL 1 - AREA C, San Mateo, CA

Built 1973 Load: 35.3 t ADT: 12,930

ROAD-1 SOUTH

Good

Over: PEDESTRIAN WALKWAY

TERMINAL 2 - AREA D, San Mateo, CA

Built 1964 Load: 35.3 t ADT: 12,930

PESCADERO RD

Good

Over: BUTANO CREEK

0.3 MI E BEAN HOLLOW RD, San Mateo, CA

Built 1961 Load: 37.3 t ADT: 2,624

U.S. HIGHWAY 101

Good

Over: UP RR SPUR

04-SM-101-21.80-SSF, San Mateo, CA

Built 1948 Load: 38.6 t ADT: 188,000

UTAH AVE

Good

Over: COLMA CREEK

0.2 MI E OF S AIRPORT BLV, San Mateo, CA

Built 1975 Load: 47.0 t ADT: 12,150

U.S. HIGHWAY 101

Good

Over: LAUREL CREEK

04-SM-101-10.25-SM, San Mateo, CA

Built 1954 Load: 49.9 t ADT: 195,000

PERALTA ROAD

Good

Over: SAN PEDRO CREEK

S. OF DELL RD, San Mateo, CA

Built 1984 Load: 49.9 t ADT: 2,389

WURR RD

Poor

Over: PESCADERO CREEK

0.1 MI E PESCADERO RD, San Mateo, CA

Built 1962 Load: 9.1 t ADT: 91

AIRPORT BLVD

Poor

Over: BURLINGAME LAGOON

1.3 MI E OF BAYSHORE HWY, San Mateo, CA

Built 1970 Load: 11.3 t ADT: 7,000

MAIN ST

Poor

Over: PILARCITOS CREEK

0.25 MI S/O SR 92, San Mateo, CA

Built 1900 Load: 16.2 t ADT: 2,350

PILARCITOS CREEK R

Poor

Over: PILARCITOS CREEK

0.46 MI N OF S.H. 92, San Mateo, CA

Built 1910 Load: 16.2 t ADT: 42

STATE ROUTE 92

Poor

Over: SAN FRANCISCO BAY

04-SM-092-R14.44-FSTC, San Mateo, CA

Built 1967 Load: 19.4 t ADT: 120,000

MAIN ROAD

Poor

Over: LITTLE BUTANO CREEK

BUTANO ST PRK 0.4 MI IN, San Mateo, CA

Built 1980 Load: 20.4 t ADT: 70

EL PRADO ROAD

Poor

Over: EASTON CREEK

JUST SE OF CANYON RD, San Mateo, CA

Built 1956 Load: 20.5 t ADT: 200

BERMUDA DR

Poor

Over: FIESTA CHANNEL

SOUTH OF FIESTA DRIVE, San Mateo, CA

Built 1955 Load: 22.0 t ADT: 1,920

U.S. HIGHWAY 101

Poor

Over: CORDILLERAS CREEK

04-SM-101-7.13-RDWC, San Mateo, CA

Built 1930 Load: 24.3 t ADT: 195,000

HILLSDALE BLVD

Poor

Over: MARINA LAGOON

0.1 MI NE OF NORFOLK ST, San Mateo, CA

Built 1963 Load: 32.4 t ADT: 46,460

GAZOS CREEK ROAD

Poor

Over: GAZOS CREEK

3.3 MI EAST OF CLOVERDALE, San Mateo, CA

Built 1982 Load: 32.4 t ADT: 218

BRIDGE DR PARKWAY

Poor

Over: REDWOOD SHORES LAGOON

EAST OF MARINE PKWY, San Mateo, CA

Built 1971 Load: 33.0 t ADT: 1,000

BRIDGE DR PARKWAY

Poor

Over: REDWOOD SHORES LAGOON

EAST OF MARINE PKWY, San Mateo, CA

Built 1971 Load: 33.4 t ADT: 2,600

LINDEN AVE

Poor

Over: COLMA CANAL

0.2 MI W US 101, San Mateo, CA

Built 1974 Load: 37.3 t ADT: 7,160

NORTH ACCESS RD

Poor

Over: SAN BRUNO CHANNEL (E)

0.3 MI E AIRPORT BLVD, San Mateo, CA

Built 1986 Load: 44.1 t ADT: 1,000

INTERSTATE 280 SB

Poor

Over: SAN FRANCISQUITO CREEK

04-SM-280-R0.30, San Mateo, CA

Built 1969 Load: 44.7 t ADT: 46,500

STATE ROUTE 84

Poor

Over: CALTRAIN,UP RR,SHASTA ST

04-SM-084-24.86-RDWC, San Mateo, CA

Built 1965 Load: 49.6 t ADT: 43,000

INTERSTATE 280 NB

Poor

Over: SAN FRANCISQUITO CREEK

04-SM-280-R0.30, San Mateo, CA

Built 1969 Load: 49.6 t ADT: 46,500

SPRUCE AVE

Poor

Over: COLMA CREEK

NORTH OF SOUTH ART CANAL, San Mateo, CA

Built 1975 Load: 61.6 t ADT: 17,332

STATE PARK RD

Poor

Over: LITTLE BUTANO CREEK

BUTANO STATE PARK, San Mateo, CA

Built 1983 Load: 68.0 t ADT: 25

TARTAN TRAIL RD

Poor

Over: SAN MATEO CREEK

WEST CRYSTAL SPRINGS RD, San Mateo, CA

Built 1964 Load: 70.0 t ADT: 1,887

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.