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)

ODDSTAD BLVD

Fair

Over: SOUTH FORK SAN PEDRO CRK

0.1 MI N LINDA MAR BLVD, San Mateo, CA

Built 1948 Load: 16.2 t ADT: 6,886

MIDDLEFIELD RD

Fair

Over: SAN FRANCISQUITO CREEK

0.1 MI E WILLOW RD, San Mateo, CA

Built 1936 Load: 16.2 t ADT: 18,700

DRAKE AVE

Fair

Over: EASTON CREEK

EAST OF EASTON DRIVE, San Mateo, CA

Built 1930 Load: 16.2 t ADT: 100

ACCESS ROAD

Fair

Over: SAN BRUNO CHANNEL

NORTH OF NORTH ACCESS RD, San Mateo, CA

Built 1948 Load: 16.2 t ADT: 8,252

STONEHEDGE ROAD

Fair

Over: SAN MATEO CREEK

500 FT N OF BRIDGE RD, San Mateo, CA

Built 1900 Load: 16.2 t ADT: 1,000

BAYWOOD DRIVE

Fair

Over: SAN MATEO CREEK

BRIDGE RD, San Mateo, CA

Built 1900 Load: 16.2 t ADT: 1,000

CLOVERDALE RD

Fair

Over: BUTANO CREEK

0.2 MI N CANYON RD, San Mateo, CA

Built 1963 Load: 16.5 t ADT: 193

STAFFORD ST

Fair

Over: CORDILLERAS CREEK

NORTH OF 'F' ST, San Mateo, CA

Built 1903 Load: 16.5 t ADT: 5,000

BAYSHORE BLVD

Fair

Over: RECREATIONAL TRAIL

0.2 MI. N. OF VALLEY DR., San Mateo, CA

Built 1928 Load: 16.8 t ADT: 35,000

DRAKE AVE

Fair

Over: SANCHEZ CREEK

EAST OF CARMELITA, San Mateo, CA

Built 1930 Load: 16.8 t ADT: 100

EMERGENCY EXIT RD

Fair

Over: ALPINE CREEK

SOUTH OF SR 84, San Mateo, CA

Built 1981 Load: 17.2 t ADT: 1

GRAND AVE EB

Fair

Over: CALTRAIN,UPRR,INDUSTRIAL

0.1 MI E OF US 101, San Mateo, CA

Built 1984 Load: 18.1 t ADT: 6,009

HIGGINS PURISIMA R

Fair

Over: MILLS CREEK

1.5 MI E OF MAIN ST, San Mateo, CA

Built 1914 Load: 18.5 t ADT: 477

PESCADERO RD

Fair

Over: HONSINGER CREEK

2.6 MI E SR 1/@ CLOVRDALE, San Mateo, CA

Built 1957 Load: 18.5 t ADT: 1,084

GERI LANE

Fair

Over: SANCHEZ CREEK

.2 MI SW OF FOREST VIEW, San Mateo, CA

Built 1930 Load: 18.5 t ADT: 1,000

BUTANO CUT OFF

Fair

Over: PESCADERO CREEK

SOUTH PESCADERO RD, San Mateo, CA

Built 1964 Load: 18.8 t ADT: 357

STATE PARK RD

Fair

Over: PETERS CREEK

PORTOLA ST. PARK, San Mateo, CA

Built 1948 Load: 19.1 t ADT: 30

SOUTH AIRPORT BLVD

Fair

Over: COLOMA CREEK

150 FT S/O MITCHELL AVE, San Mateo, CA

Built 1977 Load: 20.4 t ADT: 15,000

FASHION ISLAND DR

Fair

Over: MARINA LAGOON

0.5 MI E OF S NORFOLK ST, San Mateo, CA

Built 1967 Load: 23.0 t ADT: 13,240

KEHOE AVENUE

Fair

Over: 16TH AVENUE CHANNEL

WEST OF LODI AVE, San Mateo, CA

Built 1955 Load: 23.3 t ADT: 3,910

NORFOLK ST

Fair

Over: FIESTA CHANNEL

0.1 MI N/O DAY AVE, San Mateo, CA

Built 1955 Load: 23.7 t ADT: 8,800

STATE ROUTE 82

Fair

Over: COLMA CREEK

04-SM-082-22.36-CLM, San Mateo, CA

Built 1913 Load: 24.3 t ADT: 28,500

US 101, ROLLINS RD

Fair

Over: TRANSMISSION CANAL

04-SM-101-16.40-BURL, San Mateo, CA

Built 1928 Load: 24.3 t ADT: 232,000

STATE ROUTE 1

Fair

Over: POMPONIO CREEK

04-SM-001-16.44, San Mateo, CA

Built 1940 Load: 24.3 t ADT: 6,100

STATE ROUTE 82

Fair

Over: SAN MATEO CREEK

04-SM-082-11.82-SM, San Mateo, CA

Built 1935 Load: 24.3 t ADT: 30,250

U.S. HIGHWAY 101

Fair

Over: MARSH CREEK

04-SM-101-3.70-MLP, San Mateo, CA

Built 1930 Load: 24.3 t ADT: 199,000

STATE ROUTE 84

Fair

Over: LA HONDA CREEK

04-SM-084-8.61, San Mateo, CA

Built 1955 Load: 24.3 t ADT: 1,400

HAVEN AVE

Fair

Over: MARSH SLOUGH

04-SM-000-0.00-MLP, San Mateo, CA

Built 1954 Load: 24.3 t ADT: 6,400

PESCADERO RD

Fair

Over: ALPINE CREEK

ALPINE RD @ PESCADERO RD, San Mateo, CA

Built 1968 Load: 24.3 t ADT: 848

NORFOLK ST

Fair

Over: 16TH AVE CHANNEL

SOUTH OF LODI AVE, San Mateo, CA

Built 1953 Load: 24.3 t ADT: 5,590

BAYSHORE HWY

Fair

Over: MILLS CREEK

0.5 MI N AIRPORT BLVD, San Mateo, CA

Built 1950 Load: 24.3 t ADT: 18,000

SOUTH CANAL STREET

Fair

Over: BRANCH OF COLMA CREEK

SPRUCE AVE, San Mateo, CA

Built 1955 Load: 24.3 t ADT: 1,381

OTAY AVE

Fair

Over: LAUREL CREEK

0.05 MI E CURTISS ST, San Mateo, CA

Built 1961 Load: 24.3 t ADT: 140

LATHROP ST

Fair

Over: REDWOOD CREEK

SOUTH OF MAPLE ST, San Mateo, CA

Built 1955 Load: 24.3 t ADT: 9,000

MAPLE ST

Fair

Over: REDWOOD CREEK

NORTH LATHROP ST, San Mateo, CA

Built 1919 Load: 24.9 t ADT: 2,350

STATE ROUTE 84

Fair

Over: SAN GREGORIO CREEK

04-SM-084-6.18, San Mateo, CA

Built 1957 Load: 25.6 t ADT: 1,400

WURR ROAD

Fair

Over: PESCADERO CREEK

0.1 MI SOUTH PESCADERO, San Mateo, CA

Built 1962 Load: 25.9 t ADT: 80

GROVE DRIVE

Fair

Over: CORTE MADERA CREEK

0.1 MI E GEORGIA LANE, San Mateo, CA

Built 1985 Load: 26.6 t ADT: 1

STATE ROUTE 1

Fair

Over: SAN GREGORIO CREEK

04-SM-001-17.90, San Mateo, CA

Built 1941 Load: 28.2 t ADT: 6,100

STATE ROUTE 84

Fair

Over: SAN FRANCISCO BAY-SOUTH

04-SM-084-R29.25-MLP, San Mateo, CA

Built 1981 Load: 28.2 t ADT: 62,000

U.S. HIGHWAY 101

Fair

Over: COLMA CREEK

04-SM-101-21.61-SSF, San Mateo, CA

Built 1947 Load: 28.2 t ADT: 188,000

HILLSDALE BLVD

Fair

Over: FOSTER CITY LAGOON

.6 MI N/O FOSTER CITY BLV, San Mateo, CA

Built 1964 Load: 28.8 t ADT: 11,372

STATE ROUTE 1

Fair

Over: TUNITAS CREEK

04-SM-001-20.82, San Mateo, CA

Built 1962 Load: 30.1 t ADT: 6,000

U.S. HIGHWAY 101

Fair

Over: REDWOOD CREEK

04-SM-101-6.20-RDWC, San Mateo, CA

Built 1958 Load: 30.1 t ADT: 195,000

GRAND AVENUE WB

Fair

Over: CALTRAIN,UPRR,INDUSTRIAL

0.1 MI E OF US 101, San Mateo, CA

Built 1984 Load: 31.4 t ADT: 12,955

STATE ROUTE 1 SB

Fair

Over: CLARENDON ROAD

04-SM-001-R43.74-PFA, San Mateo, CA

Built 1965 Load: 32.4 t ADT: 16,250

STATE ROUTE 1 NB

Fair

Over: CLARENDON ROAD

04-SM-001-R43.74-PFA, San Mateo, CA

Built 1965 Load: 32.4 t ADT: 16,250

STATE ROUTE 1

Fair

Over: PESCADERO CREEK

04-SM-001-14.00, San Mateo, CA

Built 1991 Load: 32.4 t ADT: 6,100

N280-E380 CONNECTR

Fair

Over: SAN BRUNO AV-N280 ON-RMP

04-SM-280-R20.90-SBR, San Mateo, CA

Built 1971 Load: 32.4 t ADT: 11,500

STATE ROUTE 82

Fair

Over: LAUREL CREEK

04-SM-082-9.24-SM, San Mateo, CA

Built 1965 Load: 32.4 t ADT: 34,750

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.