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)

Sort:

WASHINGTON STREET

Over: INTERSTATE 280

04-SM-280-R25.97-DLC, San Mateo, CA

Built 1965 ADT: 207,000

SULLIVAN-S280 ONRP

Over: S280-S1 CONNECTOR RAMP

04-SM-280-R25.34-DLC, San Mateo, CA

Built 1967 ADT: 221,000

PALOMA AVENUE

Over: STATE ROUTE 1

04-SM-001-R44.21-PFA, San Mateo, CA

Built 1965 ADT: 32,500

PEDESTRIAN WALKWAY

Over: STATE ROUTE 1

04-SM-001-R44.88-PFA, San Mateo, CA

Built 1965 ADT: 32,500

FOSTER CITY BLVD

Over: STATE ROUTE 92

04-SM-092-R13.61-FSTC, San Mateo, CA

Built 1967 ADT: 86,000

STATE ROUTE 1

Over: GATEWAY DRIVE

04-SM-001-R46.51-DLC, San Mateo, CA

Built 1964 ADT: 7,990

INTERSTATE 280 SB

Over: CRYSTAL SPRINGS OFF-RAMP

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

Built 1967 ADT: 44,650

S280-CRYSTAL SP OR

Over: WHITMAN WAY

04-SM-280-R20.22-SBR, San Mateo, CA

Built 1967 ADT: 15,000

INTERSTATE 280 SB

Over: WHITMAN WAY

04-SM-280-R20.22-SBR, San Mateo, CA

Built 1967 ADT: 15,000

INTERSTATE 280 NB

Over: WHITMAN WAY

04-SM-280-R20.22-SBR, San Mateo, CA

Built 1967 ADT: 15,000

HILLSDALE BLVD

Over: STATE ROUTE 82

04-SM-082-9.35-SM, San Mateo, CA

Built 1965 ADT: 37,000

N280-N35 CNNTR RMP

Over: INTERSTATE 280

04-SM-035-L23.00-SBR, San Mateo, CA

Built 1967 ADT: 110,000

CRYSTAL SPRINGS RD

Over: INTERSTATE 280

04-SM-280-R19.36-SBR, San Mateo, CA

Built 1967 ADT: 111,000

INTERSTATE 280 SB

Over: KING DRIVE

04-SM-280-R23.16-DLC, San Mateo, CA

Built 1967 ADT: 6,610

INTERSTATE 280 NB

Over: KING DRIVE

04-SM-280-R23.16-DLC, San Mateo, CA

Built 1967 ADT: 6,610

STATE ROUTE 92

Over: DE ANZA BOULEVARD

04-SM-092-R8.67-SM, San Mateo, CA

Built 1967 ADT: 9,510

S1-S35 CONNECTOR

Over: STATE ROUTE 1

04-SM-001-R46.65-DLC, San Mateo, CA

Built 1972 ADT: 43,500

SB STATE ROUTE 35

Over: NB & SB RTE 1 AND RAMPS

04-SM-035-R28.66-DLC, San Mateo, CA

Built 1972 ADT: 25,000

NB STATE ROUTE 35

Over: NB & SB RTE 1 AND RAMPS

04-SM-035-R28.66-DLC, San Mateo, CA

Built 1972 ADT: 43,500

RALSTON POLHEMUS R

Over: STATE ROUTE 92

04-SM-092-R7.93, San Mateo, CA

Built 1967 ADT: 8,200

SB STATE RTE 280

Over: SERRAMONTE BOULEVARD

04-SM-280-R24.63-DLC, San Mateo, CA

Built 1967 ADT: 15,400

NB STATE RTE 280

Over: SERRAMONTE BOULEVARD

04-SM-280-R24.63-DLC, San Mateo, CA

Built 1967 ADT: 15,400

STATE ROUTE 280 SB

Over: HAYNE ROAD

04-SM-280-R14.22-HIL, San Mateo, CA

Built 1969 ADT: 2,020

STATE ROUTE 280 NB

Over: HAYNE ROAD

04-SM-280-R14.22-HIL, San Mateo, CA

Built 1969 ADT: 2,020

STATE ROUTE 280 SB

Over: HILLCREST BOULEVARD

04-SM-280-R17.92-MLBR, San Mateo, CA

Built 1969 ADT: 3,500

STATE ROUTE 280 NB

Over: HILLCREST BOULEVARD

04-SM-280-R17.92-MLBR, San Mateo, CA

Built 1969 ADT: 3,500

INTERSTATE 280 SB

Over: WESTBOROUGH BLVD

04-SM-280-R22.62-SSF, San Mateo, CA

Built 1967 ADT: 8,500

INTERSTATE 280 NB

Over: WESTBOROUGH BLVD

04-SM-280-R22.62-SSF, San Mateo, CA

Built 1967 ADT: 8,500

SB STATE RTE 280

Over: LARKSPUR DRIVE

04-SM-280-R18.52-MLBR, San Mateo, CA

Built 1969 ADT: 8,500

NB STATE RTE 280

Over: LARKSPUR DRIVE

04-SM-280-R18.52-MLBR, San Mateo, CA

Built 1969 ADT: 8,500

INTERSTATE 280

Over: I 380 & S280-E380 CNNCTR

04-SM-280-R20.97-SBR, San Mateo, CA

Built 1971 ADT: 89,300

SAN BRUNO-N280 ONR

Over: S280-E380 CONNECTOR RAMP

04-SM-280-R20.96-SBR, San Mateo, CA

Built 1971 ADT: 150,000

W380-S280 CONNECTR

Over: I 280, CONN, FRNTGE RD

04-SM-380-4.65-SBR, San Mateo, CA

Built 1971 ADT: 156,000

WB RTE380 (FUTURE)

Over: S280-E380 CONNECTOR RAMP

04-SM-380-4.67-SBR, San Mateo, CA

Built 1973 ADT: 43,500

EB RTE380 (FUTURE)

Over: S280-E380 CONNECTOR RAMP

04-SM-380-4.67-SBR, San Mateo, CA

Built 1973 ADT: 43,500

INTERSTATE 380

Over: SR 82 (EL CAMINO REAL)

04-SM-380-5.45-SBR, San Mateo, CA

Built 1971 ADT: 36,000

SNEATH LANE

Over: INTERSTATE 280

04-SM-280-R21.30-SBR, San Mateo, CA

Built 1971 ADT: 101,000

INTERSTATE 380

Over: CHERRY AVENUE

04-SM-380-T4.98-SBR, San Mateo, CA

Built 1971 ADT: 4,950

INTERSTATE 280

Over: SAN BRUNO AVENUE

04-SM-280-R20.75-SBR, San Mateo, CA

Built 1971 ADT: 8,000

INTERSTATE 280 SB

Over: AVALON DRIVE

04-SM-280-R22.04-SSF, San Mateo, CA

Built 1971 ADT: 19,000

INTERSTATE 280 NB

Over: AVALON DRIVE

04-SM-280-R22.04-SSF, San Mateo, CA

Built 1971 ADT: 19,000

INTERSTATE 280

Over: FARM HILL BOULEVARD

04-SM-280-R4.65-WDS, San Mateo, CA

Built 1969 ADT: 3,700

INTERSTATE 280 NB

Over: FARM HILL BOULEVARD

04-SM-280-R4.65-WDS, San Mateo, CA

Built 1969 ADT: 3,700

INTERSTATE 280 SB

Over: CANADA ROAD

04-SM-280-R4.99-WDS, San Mateo, CA

Built 1969 ADT: 3,700

INTERSTATE 280 NB

Over: CANADA ROAD

04-SM-280-R4.99-WDS, San Mateo, CA

Built 1969 ADT: 3,700

INTERSTATE 280 SB

Over: SR 84 (WOODSIDE EXP)

04-SM-280-R3.32-WDS, San Mateo, CA

Built 1969 ADT: 29,750

INTERSTATE 280 NB

Over: SR 84 (WOODSIDE EXP)

04-SM-280-R3.32-WDS, San Mateo, CA

Built 1969 ADT: 30,000

STATE ROUTE 1

Over: ST. FRANCIS BOULEVARD

04-SM-001-R47.03-DLC, San Mateo, CA

Built 1972 ADT: 4,630

STATE ROUTE 1

Over: CLARINADA AVENUE

04-SM-001-R47.27-DLC, San Mateo, CA

Built 1968 ADT: 8,220

N1-S280 CONNECTOR

Over: SOUTHGATE AVENUE

04-SM-001-R47.62-DLC, San Mateo, CA

Built 1968 ADT: 13,300

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

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Compiled by PlainBridges, Independent data publisher

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.