San Francisco County, CA

170 public highway bridges

San Francisco County Bridge Snapshot

San Francisco County, California contains 170 public highway bridges in the FHWA National Bridge Inventory. Roughly 16.5% are rated “Good,” 12.4% “Fair,” 2.4% “Poor,” and 2.4% 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.

170

Total Bridges

16.5%

Good

2.4%

Poor

2.4%

Structurally Deficient

Condition Distribution

Good

16.5% (28)

Fair

12.4% (21)

Poor

2.4% (4)

SD

2.4% (4)

All Bridges (170)

Sort:

ROUTE 35

Over: SUNSET BLVD

04-SF-035-2.12-SF, San Francisco, CA

Built 1931 ADT: 2,000

INTERSTATE 80

Over: YERBA BUENA ISLAND

04-SF-080-7.85L-SF, San Francisco, CA

Built 1936 ADT: 248,000

INTERSTATE 80

Over: YERBA BUENA ISLAND

04-SF-080-7.85L-SF, San Francisco, CA

Built 2007 ADT: 248,000

MISSION STREET

Over: ROUTE I 280

04-SF-280-R3.11-SF, San Francisco, CA

Built 1963 ADT: 170,000

MISSION STREET

Over: ALEMANY BLVD

04-SF-280-R3.11-SF, San Francisco, CA

Built 1951 ADT: 19,200

ALEMANY BLVD

Over: STATE RTE 1 (SPANS 4&5)

04-SF-001-R0.11-SF, San Francisco, CA

Built 1950 ADT: 122,000

INTERSTATE 280

Over: ALEMANY BLVD

04-SF-280-R0.46-SF, San Francisco, CA

Built 1966 ADT: 12,870

U.S. HIGHWAY 101

Over: 3RD STREET

04-SF-101-0.77-SF, San Francisco, CA

Built 1954 ADT: 2,000

U.S. HIGHWAY 101

Over: 3RD STREET

04-SF-101-0.77-SF, San Francisco, CA

Built 1955 ADT: 550

PEDESTRIAN WALKWAY

Over: U.S. HIGHWAY 101

04-SF-101-0.70-SF, San Francisco, CA

Built 1970 ADT: 189,000

SILVER AVE

Over: ROUTE 101

04-SF-101-1.77-SF, San Francisco, CA

Built 1954 ADT: 196,000

U.S. HIGHWAY 101

Over: 280/101 IC - ALEMANY CIR

04-SF-101-2.03-SF, San Francisco, CA

Built 1950 ADT: 500

U.S. HIGHWAY 101

Over: CESAR CHAVEZ BLVD

04-SF-101-2.92-SF, San Francisco, CA

Built 1951 ADT: 1,500

U.S. HIGHWAY 101

Over: CESAR CHAVEZ BLVD

04-SF-101-2.95-SF, San Francisco, CA

Built 1974 ADT: 500

23RD STREET

Over: U.S. HIGHWAY 101

04-SF-101-3.37-SF, San Francisco, CA

Built 1953 ADT: 234,000

STATE ROUTE 1

Over: BROTHERHOOD WAY

04-SF-001-R0.31-SF, San Francisco, CA

Built 1952 ADT: 550

U.S. HIGHWAY 101

Over: CORTLAND AVENUE

04-SF-101-2.28-SF, San Francisco, CA

Built 1950 ADT: 750

INTERSTATE 280

Over: CALTRAIN,UP RR,CITY STS

04-SF-280-R4.40L-SF, San Francisco, CA

Built 1965 ADT: 600

N101 CESAR OFFRMP

Over: SB101 BAYSHORE OFF-RAMP

04-SF-101-2.84-SF, San Francisco, CA

Built 1950 ADT: 500

18TH STREET POC

Over: U.S. HIGHWAY 101

04-SF-101-3.96-SF, San Francisco, CA

Built 1953 ADT: 234,000

25TH ST POC

Over: U.S. HIGHWAY 101

04-SF-101-3.22-SF, San Francisco, CA

Built 1953 ADT: 234,000

22ND STREET POC

Over: U.S. HIGHWAY 101

04-SF-101-3.53-SF, San Francisco, CA

Built 1953 ADT: 234,000

U.S. HIGHWAY 101

Over: PAUL AVE

04-SF-101-1.11-SF, San Francisco, CA

Built 1954 ADT: 1,500

U.S. HIGHWAY 101

Over: BACON STREET

04-SF-101-1.41-SF, San Francisco, CA

Built 1954 ADT: 1,200

U.S. HIGHWAY 101

Over: BACON STREET

04-SF-101-1.41-SF, San Francisco, CA

Built 1960 ADT: 1,000

U.S. HIGHWAY 101

Over: BLANKEN AVE

04-SF-101-0.18-SF, San Francisco, CA

Built 1954 ADT: 65

ROUTE 101N ONRAMP

Over: ALEMANY CIR UC (NBD O-R)

04-SF-101-2.20-SF, San Francisco, CA

Built 1950 ADT: 900

SB ROUTE 101 ONRMP

Over: ALEMANY CIR

04-SF-101-2.00-SF, San Francisco, CA

Built 1954 ADT: 1,200

101 AND 280

Over: 280/101 INTERCHANGE

04-SF-101-1.63-SF, San Francisco, CA

Built 1960 ADT: 10,000

S280-S101 CONNECTR

Over: N101-N280 CONNECTOR RAMP

04-SF-280-R4.07L-SF, San Francisco, CA

Built 1966 ADT: 24,800

I 280 - 101S (WU)

Over: 280/101 INTERCHANGE

04-SF-101-1.48-SF, San Francisco, CA

Built 1960 ADT: 222,000

S101-S280 CONNECTO

Over: 280/101 IC -ALEMANY BLVD

04-SF-101-1.94-SF, San Francisco, CA

Built 1960 ADT: 450

ALEMANY BLVD NB

Over: ROUTE I 280

04-SF-280-R3.87-SF, San Francisco, CA

Built 1963 ADT: 170,000

ALEMANY BLVD SB

Over: ROUTE I 280

04-SF-280-R3.28-SF, San Francisco, CA

Built 1963 ADT: 170,000

JUSTIN DRIVE

Over: ROUTE I 280

04-SF-280-R3.23-SF, San Francisco, CA

Built 1963 ADT: 170,000

PEDESTRIAN WALKWAY

Over: INTERSTATE 280

04-SF-280-R3.53-SF, San Francisco, CA

Built 1963 ADT: 170,000

U.S. HIGHWAY 101

Over: I-80 & US 101 RAMPS,STRS

04-SF-101-R4.25L-SF, San Francisco, CA

Built 1955 ADT: 199,000

THERESA ST POC

Over: RTE I 280S ONRAMP

04-SF-280-R2.62-SF, San Francisco, CA

Built 1964 ADT: 170,000

I280S OFF-MONTEREY

Over: I 280,SAN JOSE,MUNI,BART

04-SF-280-R2.72-SF, San Francisco, CA

Built 1964 ADT: 10,000

ROUTE I 280 SB

Over: SAN JOSE AVE, MUNIRAIL

04-SF-280-R2.70-SF, San Francisco, CA

Built 1964 ADT: 10,000

ROUTE I 280

Over: SAN JOSE AVE, MUNIRAIL

04-SF-280-R2.70-SF, San Francisco, CA

Built 1964 ADT: 10,000

RTE I 280N OFFRAMP

Over: SAN JOSE AVE, MUNIRAIL

04-SF-280-R2.69-SF, San Francisco, CA

Built 1964 ADT: 10,000

MONTEREY-I 280N ON

Over: I 280,SAN JOSE,MUNI,BART

04-SF-280-R2.69-SF, San Francisco, CA

Built 1964 ADT: 21,600

PAULDING/JUDSON ST

Over: RTE I 280, BART-2 TRACKS

04-SF-280-R2.21-SF, San Francisco, CA

Built 1964 ADT: 170,000

BADEN STREET

Over: RTE I 280, BART TUNNELS

04-SF-280-R2.47-SF, San Francisco, CA

Built 1964 ADT: 170,000

I 280

Over: SAN JOSE & SICKLES AVE

04-SF-280-R0.71-SF, San Francisco, CA

Built 1964 ADT: 21,600

RTE I 280 N ONRAMP

Over: SICKLES AVENUE

04-SF-280-R0.75-SF, San Francisco, CA

Built 1964 ADT: 10,000

SAN JOSE AVE

Over: SB 280 OFF-RAMP

04-SF-280-R0.90-SF, San Francisco, CA

Built 1964 ADT: 13,300

SAN JOSE, MUNIRAIL

Over: ROUTE I 280

04-SF-280-R1.46-SF, San Francisco, CA

Built 1964 ADT: 166,000

ST RTE 101 (5TH ST

Over: BAYSHORE VIADUCT

04-SF-101-4.12-SF, San Francisco, CA

Built 1955 ADT: 2,600

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026