San Mateo County, CA

393 public highway bridges

San Mateo County Bridge Snapshot

San Mateo County, California contains 393 public highway bridges in the FHWA National Bridge Inventory. Roughly 16.3% are rated “Good,” 31.3% “Fair,” 5.3% “Poor,” and 5.3% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in CA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

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

393
Total Bridges
16.3%
Good
5.3%
Poor
5.3%
Structurally Deficient

Condition Distribution

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

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

PILARCITOS CREEK R

Structurally Deficient

Over: PILARCITOS CREEK

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

Built 1910 Load: 16.2 t ADT: 42

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

Related

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial