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:

STATE ROUTE 1 SB

Over: SOUTHGATE AVENUE

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

Built 1968 ADT: 13,300

STATE ROUTE 1 NB

Over: SOUTHGATE AVENUE

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

Built 1968 ADT: 13,300

INTERSTATE 280 SB

Over: STATE ROUTE 92

04-SM-280-10.81, San Mateo, CA

Built 1973 ADT: 22,200

INTERSTATE 280 NB

Over: STATE ROUTE 92

04-SM-280-10.81, San Mateo, CA

Built 1973 ADT: 72,000

N280-W92 CONNECTOR

Over: INTERSTATE 280, SR 92

04-SM-280-10.91, San Mateo, CA

Built 1974 ADT: 111,000

S280-E92 CONNECTOR

Over: INTERSTATE 280, SR 92

04-SM-280-10.80, San Mateo, CA

Built 1973 ADT: 111,000

INTERSTATE 280 SB

Over: EDGEWOOD ROAD

04-SM-280-6.65, San Mateo, CA

Built 1973 ADT: 3,500

INTERSTATE 280 NB

Over: EDGEWOOD ROAD

04-SM-280-6.65, San Mateo, CA

Built 1973 ADT: 3,500

PEDESTRIAN WALKWAY

Over: STATE ROUTE 84

04-SM-084-25.13-RDWC, San Mateo, CA

Built 1967 ADT: 43,000

SR 92 WB & RAMPS

Over: U.S. 101, MARINA LAGOON

04-SM-092-R11.78-SM, San Mateo, CA

Built 1971 ADT: 9,930

SR 92 EB & RAMPS

Over: U.S. 101, MARINA LAGOON

04-SM-092-R11.78-SM, San Mateo, CA

Built 1971 ADT: 4,610

INTERSTATE 380

Over: CALTRAIN,UP RR,BART,ETC

04-SM-380-5.73-SBR, San Mateo, CA

Built 1971 ADT: 13,100

E380-N101 CONNECTR

Over: I 380,US 101, RAMPS, 7TH

04-SM-380-6.37-SBR, San Mateo, CA

Built 1976 ADT: 11,000

INTERSTATE 380 WB

Over: US 101, RAMPS, CITY ST

04-SM-380-6.33-SBR, San Mateo, CA

Built 1976 ADT: 188,000

INTERSTATE 380 EB

Over: US 101, RAMPS, CITY ST

04-SM-380-6.32-SBR, San Mateo, CA

Built 1976 ADT: 188,000

S101-W380 CONNECTR

Over: 7TH AVENUE

04-SM-101-R20.65-SBR, San Mateo, CA

Built 1976 ADT: 4,500

INTERSTATE 380 WB

Over: 7TH AVENUE

04-SM-380-6.20-SBR, San Mateo, CA

Built 1976 ADT: 11,000

INTERSTATE 380 EB

Over: 7TH AVENUE

04-SM-380-6.20-SBR, San Mateo, CA

Built 1976 ADT: 11,000

N101-W380 CONNECTR

Over: I 380, US 101, 7TH, CONN

04-SM-101-R20.52, San Mateo, CA

Built 1976 ADT: 60,000

E380-S101 CONNECTR

Over: S101-SAN BRUNO AV,7TH AV

04-SM-380-6.19-SBR, San Mateo, CA

Built 1976 ADT: 11,950

SAN BRUNO AVENUE

Over: U.S. HIGHWAY 101

04-SM-101-R20.39-SBR, San Mateo, CA

Built 1976 ADT: 55,000

W380-N&S101 CONN

Over: US 101,I 380,EB CON,RMPS

04-SM-380-6.40-SBR, San Mateo, CA

Built 1976 ADT: 20,400

N&S101-E380 CNNCTR

Over: US 101, RMPS, NORTH CHNL

04-SM-101-R20.69-SBR, San Mateo, CA

Built 1976 ADT: 248,000

SFO AIRPRT-S101 ON

Over: U.S. HIGHWAY 101

04-SM-101-19.09, San Mateo, CA

Built 1987 ADT: 8,000

S101-SFO AIRPT OFF

Over: U.S. HIGHWAY 101

04-SM-101-19.26, San Mateo, CA

Built 1987 ADT: 16,900

INTERSTATE 280 SB

Over: CANADA ROAD

04-SM-280-R6.60, San Mateo, CA

Built 1973 ADT: 3,700

INTERSTATE 280 NB

Over: CANADA ROAD

04-SM-280-R6.60, San Mateo, CA

Built 1973 ADT: 3,700

MARINERS ISLAND BL

Over: STATE ROUTE 92

04-SM-092-R12.78-SM, San Mateo, CA

Built 1977 ADT: 105,000

CRYSTAL SP BIKE OC

Over: INTERSTATE 280

04-SM-280-10.56, San Mateo, CA

Built 1973 ADT: 109,000

SFO-W380 CONN RMP

Over: N101-SAN BRUNO OFF-RAMP

04-SM-380-6.44, San Mateo, CA

Built 1987 ADT: 6,000

N280-S1 CONNECTOR

Over: SOUTHGATE AVENUE

04-SM-280-R25.32-DLC, San Mateo, CA

Built 1968 ADT: 11,000

VINTAGE PARK DRIVE

Over: STATE ROUTE 92

04-SM-092-R13.25-FSTC, San Mateo, CA

Built 1991 ADT: 105,000

D ST-S280&S1 ONRMP

Over: I 280, SULLIVAN-S280 RMP

04-SM-280-R25.60-DLC, San Mateo, CA

Built 1993 ADT: 221,000

OYSTER POINT BLVD

Over: US HIGHWAY 101

04-SM-101-22.82-SSF, San Mateo, CA

Built 1994 ADT: 196,000

S101-OYSTER POINT

Over: US HIGHWAY 101

04-SM-101-22.78, San Mateo, CA

Built 2004 ADT: 6,000

OYSTER POINT-S101

Over: US HIGHWAY 101

04-SM-101-22.70-SSF, San Mateo, CA

Built 1995 ADT: 219,000

BART TRACKS

Over: STATE ROUTE 82

04-SM-082-23.00-CLM, San Mateo, CA

Built 1994 ADT: 28,500

S101-SFO AIRPT OFF

Over: US 101, 2 AIRPRT-S101 ON

04-SM-101-19.12, San Mateo, CA

Built 2000 ADT: 248,000

SFO AIRPRT-S101 ON

Over: U.S. HIGHWAY 101

04-SM-101-19.29, San Mateo, CA

Built 2000 ADT: 235,000

N101-SFO ARPRT OFF

Over: MILLBRAE AV-N101 ON RAMP

04-SM-101-18.54, San Mateo, CA

Built 2000 ADT: 8,000

UTILITIES/PIPES

Over: INTERSTATE 280

04-SM-280-R25.87-DLC, San Mateo, CA

Built 1998 ADT: 5,000

BART

Over: US101, I-380 AIRPRT RMPS

04-SM-101-19.30, San Mateo, CA

Built 2001 ADT: 248,000

PEDESTRIAN WALKWAY

Over: U.S. HIGHWAY 101

04-SM-101-9.72-BMT, San Mateo, CA

Built 2009 ADT: 236,000

ISLAND PARKWAY

Over: MARINE PKWY TO NB 101

04-SM-101-9.60-RDWC, San Mateo, CA

Built 2004 ADT: 5,000

PEDESTRIAN WALKWAY

Over: U.S. HIGHWAY 101

04-SM-101-16.53-BURL, San Mateo, CA

Built 2009 ADT: 15,000

PEDESTRIAN WALKWAY

Over: U.S. HIGHWAY 101

04-SM-101-13.95-SM, San Mateo, CA

Built 2009 ADT: 232,000

PEDESTRIAN WALKWAY

Over: U.S. HIGHWAY 101

04-SM-101-2.57-MLP, San Mateo, CA

Built 2012 ADT: 199,000

PENINSULA AVENUE

Over: U.S. HIGHWAY 101

04-SM-101-14.69-SM, San Mateo, CA

Built 2010 ADT: 232,000

BROADWAY AVE

Over: U.S. HIGHWAY 101

04-SM-101-16.61-BURL, San Mateo, CA

Built 2016 ADT: 226,000

PEDESTRIAN WALKWAY

Over: U.S. HIGHWAY 101,E FRONT

04-SM-101-0.47-EAPA, San Mateo, CA

Built 2019 ADT: 25,000

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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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.