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)

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.

Related

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