San Luis Obispo County, CA

408 public highway bridges

San Luis Obispo County Bridge Snapshot

San Luis Obispo County, California contains 408 public highway bridges in the FHWA National Bridge Inventory. Roughly 33.3% are rated “Good,” 43.1% “Fair,” 4.7% “Poor,” and 4.7% 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.

408

Total Bridges

33.3%

Good

4.7%

Poor

4.7%

Structurally Deficient

Condition Distribution

Good

33.3% (136)

Fair

43.1% (176)

Poor

4.7% (19)

SD

4.7% (19)

All Bridges (408)

Sort:

US HIGHWAY 101 SB

Over: MARSH STREET

05-SLO-101-28.07-SLO, San Luis Obispo, CA

Built 1953 ADT: 10,994

US HIGHWAY 101 NB

Over: MARSH STREET

05-SLO-101-28.07-SLO, San Luis Obispo, CA

Built 1953 ADT: 10,994

US HIGHWAY 101 SB

Over: PISMO CR, N101-PRICE OFF

05-SLO-101-16.40-PBCH, San Luis Obispo, CA

Built 1960 ADT: 5,900

US HIGHWAY 101 NB

Over: PISMO CR, N101-PRICE OFF

05-SLO-101-16.40-PBCH, San Luis Obispo, CA

Built 1960 ADT: 5,900

US HIGHWAY 101 SB

Over: UP RR, AMTRAK, FRADY LN,

05-SLO-101-16.17-PBCH, San Luis Obispo, CA

Built 1956 ADT: 1,000

US HIGHWAY 101 NB

Over: UP RR, AMTRAK, FRADY LN,

05-SLO-101-16.17-PBCH, San Luis Obispo, CA

Built 1956 ADT: 1,000

UP RR & AMTRAK

Over: STATE ROUTE 1

05-SLO-001-1.29, San Luis Obispo, CA

Built 1957 ADT: 5,000

US HIGHWAY 101 SB

Over: CHORRO STREET

05-SLO-101-28.81-SLO, San Luis Obispo, CA

Built 1953 ADT: 2,530

US HIGHWAY 101 NB

Over: CHORRO STREET

05-SLO-101-28.81-SLO, San Luis Obispo, CA

Built 1953 ADT: 253

CALIFORNIA BLVD

Over: US HIGHWAY 101

05-SLO-101-29.40-SLO, San Luis Obispo, CA

Built 1954 ADT: 62,000

US HIGHWAY 101 SB

Over: GRAND AVE

05-SLO-101-29.77-SLO, San Luis Obispo, CA

Built 1953 ADT: 4,178

US HIGHWAY 101 NB

Over: GRAND AVE

05-SLO-101-29.77-SLO, San Luis Obispo, CA

Built 1953 ADT: 4,178

BUENA VISTA AVE

Over: US HIGHWAY 101

05-SLO-101-29.99-SLO, San Luis Obispo, CA

Built 1953 ADT: 43,000

MORRO BAY BLVD

Over: STATE ROUTE 1

05-SLO-001-28.82-MOBY, San Luis Obispo, CA

Built 1962 ADT: 24,000

STATE ROUTE 1

Over: MAIN STREET

05-SLO-001-29.62-MOBY, San Luis Obispo, CA

Built 1962 ADT: 1,000

US HIGHWAY 101 SB

Over: S HIGUERA ST

05-SLO-101-R24.30, San Luis Obispo, CA

Built 1963 ADT: 7,599

US HIGHWAY 101 NB

Over: S HIGUERA ST

05-SLO-101-R24.30, San Luis Obispo, CA

Built 1963 ADT: 7,599

US HIGHWAY 101 SB

Over: ST RTE 166 (@PM 8.93)

05-SLO-101-0.80, San Luis Obispo, CA

Built 1962 ADT: 3,200

US HIGHWAY 101 NB

Over: ST RTE 166 (@PM 8.93)

05-SLO-101-0.80, San Luis Obispo, CA

Built 1962 ADT: 3,200

HINDS AVE

Over: US HIGHWAY 101

05-SLO-101-16.62-PBCH, San Luis Obispo, CA

Built 1960 ADT: 56,000

SAN ANSELMO RD

Over: US HIGHWAY 101

05-SLO-101-46.87-ATAS, San Luis Obispo, CA

Built 1966 ADT: 58,000

DEL RIO ROAD

Over: US HIGHWAY 101

05-SLO-101-48.33, San Luis Obispo, CA

Built 1967 ADT: 58,000

STATE ROUTE 1

Over: US HWY 101 (@PM 29.07)

05-SLO-001-16.77-SLO, San Luis Obispo, CA

Built 1953 ADT: 62,000

13TH ST

Over: US HIGHWAY 101

05-SLO-101-56.88-PSRS, San Luis Obispo, CA

Built 1958 ADT: 30,000

UP RR & AMTRAK

Over: US HIGHWAY 101

05-SLO-101-29.38-SLO, San Luis Obispo, CA

Built 1953 ADT: 62,000

US HIGHWAY 101 SB

Over: UP RR,AMTRAK,N101-SPRING

05-SLO-101-55.72-PSRS, San Luis Obispo, CA

Built 1958 ADT: 6,000

US HIGHWAY 101 NB

Over: UP RR, HWY 101 N OFFRAMP

05-SLO-101-55.67-PSRS, San Luis Obispo, CA

Built 1958 ADT: 6,500

US HIGHWAY 101 SB

Over: TRAFFIC WAY

05-SLO-101-45.96-ATAS, San Luis Obispo, CA

Built 1956 ADT: 8,000

US HIGHWAY 101 NB

Over: TRAFFIC WAY

05-SLO-101-45.96-ATAS, San Luis Obispo, CA

Built 1956 ADT: 8,000

U.S. HIGHWAY 101

Over: BRISCO RD

05-SLO-101-13.75-ARGD, San Luis Obispo, CA

Built 1956 ADT: 8,000

OAK PARK BLVD

Over: US HIGHWAY 101

05-SLO-101-14.61, San Luis Obispo, CA

Built 1993 ADT: 77,200

SANTA BARBARA RD

Over: US HIGHWAY 101

05-SLO-101-42.27, San Luis Obispo, CA

Built 1962 ADT: 53,000

STATE ROUTE 58

Over: US HWY 101 (@PM 37.86)

05-SLO-058-0.03, San Luis Obispo, CA

Built 1956 ADT: 43,000

SANTA ROSA ROAD

Over: US HIGHWAY 101

05-SLO-101-44.01-ATAS, San Luis Obispo, CA

Built 1956 ADT: 53,000

CURBARIL AVE

Over: US HIGHWAY 101

05-SLO-101-44.84-ATAS, San Luis Obispo, CA

Built 1962 ADT: 53,000

US HIGHWAY 101 SB

Over: MISSION ST-S101 ON RAMP

05-SLO-101-65.06, San Luis Obispo, CA

Built 2020 ADT: 3,350

US HIGHWAY 101 NB

Over: MISSION ST-S101 ON RAMP

05-SLO-101-65.08, San Luis Obispo, CA

Built 1957 ADT: 3,350

US HIGHWAY 101 NB

Over: TENTH STREET

05-SLO-101-65.56, San Luis Obispo, CA

Built 1957 ADT: 2,000

US HIGHWAY 101 SB

Over: S101-MISSION ST OFF-RAMP

05-SLO-101-67.23, San Luis Obispo, CA

Built 1965 ADT: 2,700

US HIGHWAY 101 NB

Over: S101-MISSION ST OFF-RAMP

05-SLO-101-67.23, San Luis Obispo, CA

Built 1957 ADT: 2,700

US HIGHWAY 101 SB

Over: ST RTE 46 (@PM 29.76)

05-SLO-101-57.91-PSRS, San Luis Obispo, CA

Built 1992 ADT: 25,000

US HIGHWAY 101 NB

Over: ST RTE 46 (@PM 29.76)

05-SLO-101-57.91-PSRS, San Luis Obispo, CA

Built 1992 ADT: 25,000

US HIGHWAY 101 NB

Over: BRIDGE ST-S101 ON RAMP

05-SLO-101-12.52-ARGD, San Luis Obispo, CA

Built 1959 ADT: 2,800

FAIR OAKS AVE

Over: US HIGHWAY 101

05-SLO-101-12.80-ARGD, San Luis Obispo, CA

Built 1959 ADT: 48,000

GRAND AVE

Over: US HWY 101 (@PM 13.17)

05-SLO-101-13.17-ARGD, San Luis Obispo, CA

Built 1959 ADT: 48,000

STATE ROUTE 1

Over: BAYWOOD PARK ROAD

05-SLO-001-27.88, San Luis Obispo, CA

Built 1959 ADT: 2,000

STATE ROUTE 1

Over: SR 41 (@PM 0.01)

05-SLO-001-30.14, San Luis Obispo, CA

Built 1962 ADT: 6,500

US HIGHWAY 101 SB

Over: WADSWORTH AVE

05-SLO-101-16.88-PBCH, San Luis Obispo, CA

Built 1960 ADT: 1,100

US HIGHWAY 101 NB

Over: WADSWORTH AVE

05-SLO-101-16.88-PBCH, San Luis Obispo, CA

Built 1960 ADT: 1,100

US HIGHWAY 101 SB

Over: ST RTE 1 (@PM 16.77)

05-SLO-101-17.74-PBCH, San Luis Obispo, CA

Built 1960 ADT: 28,000

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