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)

INTERSTATE 280 NB

Fair

Over: CRYSTAL SPRINGS OFF-RAMP

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

Built 1967 Load: 52.5 t ADT: 49,500

NORTH ACCESS RD

Fair

Over: SAN BRUNO CHANNEL

EAST OF AIRPORT BLVD, San Mateo, CA

Built 1986 Load: 56.4 t ADT: 9,494

PESCADERO RD

Fair

Over: PESCADERO CREEK

3 MI E BUTANO CUTT-OFF, San Mateo, CA

Built 1937 Load: 57.3 t ADT: 620

BEACH PARK BLVD

Fair

Over: FOSTER CITY LAGOON

0.1 MI E EDGEWATER BLVD, San Mateo, CA

Built 1975 Load: 57.3 t ADT: 9,750

W380-N101 CONNECTR

Fair

Over: NORTH CHANNEL

04-SM-380-6.48-SBR, San Mateo, CA

Built 1976 Load: 57.7 t ADT: 1,700

PESCADERO RD

Fair

Over: PESCADERO CREEK

2 MI E BUTANO CUTOFF, San Mateo, CA

Built 1937 Load: 61.6 t ADT: 720

SAND HILL RD

Fair

Over: BEAR GULCH CREEK

SOUTH WHISKEY HILL RD, San Mateo, CA

Built 1950 Load: 97.2 t ADT: 7,137

STATE ROUTE 84

Fair

Over: LA HONDA CREEK

04-SM-084-9.67, San Mateo, CA

Built 1954 Load: 99.9 t ADT: 2,900

NORTH B STREET

Good

Over: SAN MATEO CREEK

BALDWIN AVE @ NORTH B ST, San Mateo, CA

Built 1924 Load: 14.9 t ADT: 2,790

CRYSTAL SPRINGS RD

Good

Over: SAN MATEO CREEK

N EL CERRITO AVE, San Mateo, CA

Built 1904 Load: 15.2 t ADT: 10,000

DELAWARE ST

Good

Over: SAN MATEO CREEK

SOUTH OF CYPRESS AVE, San Mateo, CA

Built 1910 Load: 15.2 t ADT: 8,530

N CLAREMONT

Good

Over: SAN MATEO CREEK

NORTH OF 1ST ST, San Mateo, CA

Built 1920 Load: 15.9 t ADT: 1,830

OLD COUNTY RD

Good

Over: PULGAS CREEK

SOUTH COMMERCIAL ST, San Mateo, CA

Built 1920 Load: 16.2 t ADT: 7,000

FREMONT ST

Good

Over: SAN MATEO CREEK

2ND AVE & FREMONT ST, San Mateo, CA

Built 1920 Load: 16.8 t ADT: 2,890

SIERRA DRIVE

Good

Over: SAN MATEO CREEK

EL CERRITO AVE, San Mateo, CA

Built 1930 Load: 16.8 t ADT: 1,000

KINGS MOUNTAIN RD

Good

Over: WEST UNION CREEK

0.05 MI E TRIPP RD, San Mateo, CA

Built 1905 Load: 17.2 t ADT: 2,075

CANYON ROAD

Good

Over: SLIDE

1 MI NE OF CLOVERDALE RD, San Mateo, CA

Built 2000 Load: 21.4 t ADT: 120

NIMITZ DRIVE

Good

Over: FORK DRIVE

1300 SNEATH LN LN, SAN BR, San Mateo, CA

Built 1940 Load: 21.8 t ADT: 10

STATE ROUTE 84

Good

Over: EL CORTE DE MADERA CREEK

04-SM-084-3.92, San Mateo, CA

Built 1954 Load: 22.7 t ADT: 1,400

U.S. HIGHWAY 101

Good

Over: SAN MATEO CREEK

04-SM-101-13.44-SM, San Mateo, CA

Built 1928 Load: 24.0 t ADT: 236,000

U.S. HIGHWAY 101

Good

Over: BELMONT CREEK

04-SM-101-9.11-BMT, San Mateo, CA

Built 1930 Load: 24.3 t ADT: 195,000

INDUSTRIAL WAY

Good

Over: BELMONT CREEK

SOUTH HARBOR BLVD, San Mateo, CA

Built 1950 Load: 24.3 t ADT: 4,592

MARINE PKWY

Good

Over: BELMONT SLOUGH

EAST OF S.H. 101, San Mateo, CA

Built 1968 Load: 24.3 t ADT: 8,200

DELAWARE ST

Good

Over: FIESTA CHANNEL

0.3 MI S OF SH 92, San Mateo, CA

Built 1953 Load: 24.3 t ADT: 14,280

MARSH RD

Good

Over: MARSH SLOUGH

MARSH RD AT ROLISON, San Mateo, CA

Built 1960 Load: 24.3 t ADT: 5,300

ROAD-1 SOUTH

Good

Over: PEDESTRIAN WALKWAY

TERMINAL 3 - AREA F, San Mateo, CA

Built 1973 Load: 24.3 t ADT: 12,930

STATE PARK RD

Good

Over: PESCADERO CREEK

PORTOLA STATE PARK, San Mateo, CA

Built 2009 Load: 24.3 t ADT: 6

UNIVERSITY AVE

Good

Over: SAN FRANCISQUITO CREEK

0.01 MI S WOODLAND AVE, San Mateo, CA

Built 1925 Load: 24.6 t ADT: 24,200

STATE ROUTE 84

Good

Over: SAN GREGORIO CREEK

04-SM-084-7.55, San Mateo, CA

Built 1957 Load: 25.9 t ADT: 1,400

I-280 SB ONRAMP

Good

Over: LOS TRANCOS CREEK

04-SM-280-R0.01, San Mateo, CA

Built 1969 Load: 27.2 t ADT: 2,100

STAGE RD

Good

Over: SAN GREGORIO CREEK

0.1 MI S OF S.H. 84, San Mateo, CA

Built 1981 Load: 29.2 t ADT: 272

WILLOWBROOK DR

Good

Over: CORTE MADERA CREEK

0.2 MI S PORTOLA DR, San Mateo, CA

Built 1989 Load: 29.2 t ADT: 5,000

STATE ROUTE 1

Good

Over: GAZOS CREEK

04-SM-001-5.73, San Mateo, CA

Built 1958 Load: 30.1 t ADT: 4,400

STATE ROUTE 84

Good

Over: LA HONDA CREEK

04-SM-084-8.10, San Mateo, CA

Built 1957 Load: 30.1 t ADT: 1,400

3RD AVE-N101 ON RP

Good

Over: SAN MATEO CREEK

04-SM-101-13.44-SM, San Mateo, CA

Built 2004 Load: 32.4 t ADT: 15,000

N101-3RD AV OFFRMP

Good

Over: SAN MATEO CREEK

04-SM-101-13.44-SM, San Mateo, CA

Built 2004 Load: 32.4 t ADT: 20,000

U.S. HIGHWAY 101

Good

Over: PULGAS CREEK

04-SM-101-7.66-SCAR, San Mateo, CA

Built 2001 Load: 32.4 t ADT: 195,000

S101-3RD AVE OFFRP

Good

Over: SAN MATEO CREEK

04-SM-101-13.45-SM, San Mateo, CA

Built 1996 Load: 32.4 t ADT: 14,400

STATE ROUTE 1 SB

Good

Over: PILARCITOS CREEK

04-SM-001-28.92-HMBY, San Mateo, CA

Built 1954 Load: 32.4 t ADT: 14,750

STATE ROUTE 1 NB

Good

Over: PILARCITOS CREEK

04-SM-001-28.92-HMBY, San Mateo, CA

Built 1954 Load: 32.4 t ADT: 14,750

STATE ROUTE 1

Good

Over: LAKESHIRE DRIVE

04-SM-001-R46.86-DLC, San Mateo, CA

Built 1972 Load: 32.4 t ADT: 65,000

S280-SAN BRUNO OFF

Good

Over: INTERSTATE 380 (FUTURE)

04-SM-280-R20.98-SBR, San Mateo, CA

Built 1973 Load: 32.4 t ADT: 5,785

U.S. HIGHWAY 101

Good

Over: NORTH CHANNEL

04-SM-101-R20.63, San Mateo, CA

Built 1976 Load: 32.4 t ADT: 188,000

STATE ROUTE 84

Good

Over: PEDESTRIAN WALKWAY

04-SM-084-R27.62-MLP, San Mateo, CA

Built 1983 Load: 32.4 t ADT: 27,500

U.S. HIGHWAY 101

Good

Over: OYSTER POINT DRAIN

04-SM-101-22.90-SSF, San Mateo, CA

Built 1995 Load: 32.4 t ADT: 196,000

INTERSTATE 280

Good

Over: HILLSIDE

04-SM-280-R21.55, San Mateo, CA

Built 1994 Load: 32.4 t ADT: 101,000

STATE ROUTE 1

Good

Over: DEVIL SLIDE

04-SM-001-R39.93-PFA, San Mateo, CA

Built 2009 Load: 32.4 t ADT: 14,500

STATE ROUTE 1

Good

Over: DEVIL SLIDE

04-SM-001-R39.93-PFA, San Mateo, CA

Built 2009 Load: 32.4 t ADT: 14,500

US 101,W&E BAYSHR

Good

Over: SAN FRANCISQUITO CREEK

04-SM-101-0.01-PA, San Mateo, CA

Built 2018 Load: 32.4 t ADT: 225,800

STATE ROUTE 1

Good

Over: SAN PEDRO CREEK

04-SM-001-40.83, San Mateo, CA

Built 2015 Load: 32.4 t ADT: 14,500

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.