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 NB

Over: ST RTE 1 (@PM 16.77)

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

Built 1960 ADT: 28,000

LOS OSOS VALLEY RD

Over: US HIGHWAY 101

05-SLO-101-25.91-SLO, San Luis Obispo, CA

Built 1961 ADT: 56,000

LOS OSOS VALLEY RD

Over: US HIGHWAY 101

05-SLO-101-25.91-SLO, San Luis Obispo, CA

Built 2015 ADT: 56,000

MADONNA RD

Over: US HWY 101 (@PM 27.50)

05-SLO-101-27.50-SLO, San Luis Obispo, CA

Built 1963 ADT: 56,000

US HIGHWAY 101 SB

Over: AVILA BEACH DR

05-SLO-101-R21.10, San Luis Obispo, CA

Built 1963 ADT: 10,349

US HIGHWAY 101 NB

Over: AVILA BEACH DR

05-SLO-101-R21.10, San Luis Obispo, CA

Built 1963 ADT: 10,349

SAN LUIS BAY DR

Over: US HIGHWAY 101

05-SLO-101-R22.30, San Luis Obispo, CA

Built 1963 ADT: 62,000

SAN RAMON ROAD

Over: US HIGHWAY 101

05-SLO-101-49.32, San Luis Obispo, CA

Built 1967 ADT: 77,000

US HIGHWAY 101 SB

Over: LAS TABLAS AVE

05-SLO-101-51.45, San Luis Obispo, CA

Built 1967 ADT: 2,000

US HIGHWAY 101 NB

Over: LAS TABLAS AVE

05-SLO-101-51.45, San Luis Obispo, CA

Built 1967 ADT: 2,000

VINEYARD DR

Over: US HIGHWAY 101

05-SLO-101-50.64, San Luis Obispo, CA

Built 1967 ADT: 62,000

US HIGHWAY 101 SB

Over: SR 46 (@PM 21.96)

05-SLO-101-54.11-PSRS, San Luis Obispo, CA

Built 1966 ADT: 6,000

US HIGHWAY 101 NB

Over: SR 46 (@PM 21.96)

05-SLO-101-54.11-PSRS, San Luis Obispo, CA

Built 1966 ADT: 6,000

CAYUCOS DR

Over: STATE ROUTE 1

05-SLO-001-R35.96, San Luis Obispo, CA

Built 1965 ADT: 7,800

MAIN STREET

Over: US HIGHWAY 101

05-SLO-101-52.44, San Luis Obispo, CA

Built 1966 ADT: 62,000

US HIGHWAY 101 SB

Over: LOS BERROS ROAD

05-SLO-101-7.84, San Luis Obispo, CA

Built 1970 ADT: 7,800

US HIGHWAY 101 NB

Over: LOS BERROS ROAD

05-SLO-101-7.84, San Luis Obispo, CA

Built 1970 ADT: 7,800

STATE ROUTE 41

Over: SALINAS R,UP RR,SYCAMORE

05-SLO-041-R16.94-ATAS, San Luis Obispo, CA

Built 2000 ADT: 1,050

NIBLICK ROAD

Over: US HIGHWAY 101

05-SLO-101-55.97-PSRS, San Luis Obispo, CA

Built 1987 ADT: 30,000

FOURTH STREET

Over: US HIGHWAY 101

05-SLO-101-15.58, San Luis Obispo, CA

Built 1998 ADT: 56,000

TEFFT ST

Over: US HIGHWAY 101

05-SLO-101-4.85, San Luis Obispo, CA

Built 1996 ADT: 68,400

US HIGHWAY 101

Over: ST RTE 41 (@PM15.96)

05-SLO-101-45.56-ATAS, San Luis Obispo, CA

Built 2010 ADT: 7,300

MONTEREY STREET

Over: MONTEREY STREET

20M NW OF PEPPER STREET, San Luis Obispo, CA

Built 1901 ADT: 14,092

UP RR & AMTRAK

Over: JOHNSON AVE

SE OF BUCHON ST, San Luis Obispo, CA

Built 1957 ADT: 13,099

UP RR & AMTRAK

Over: TANK FARM ROAD

0.4 MI E OF HOLLYHOCK RD, San Luis Obispo, CA

Built 1988 ADT: 7,952

UP RR & AMTRAK

Over: CAPISTRANO AVE

0.2MI N FROM INTX VIA AVE, San Luis Obispo, CA

Built 1902 ADT: 2,920

PEDESTRIAN WALKWAY

Over: STATE ROUTE 227

.06 MI SW OF HUASNA RD, San Luis Obispo, CA

Built 1963 ADT: 16,200

TALLY FARMS ROAD

Over: ARROYO GRANDE CREEK

6.9 MI N OF SR 101, San Luis Obispo, CA

Built 1964 Load: 5.2 t ADT: 100

MONTE RD

Over: SQUIRE CREEK

0.25 MI S/O SAN LUIS B DR, San Luis Obispo, CA

Built 1958 Load: 9.4 t ADT: 200

DOVER CANYON RD

Over: JACK CREEK

1.3 MI SW OF VINEYARD DR, San Luis Obispo, CA

Built 1920 Load: 10.7 t ADT: 151

MADONNA RD

Over: PREFUMO CREEK

SLO CTY, San Luis Obispo, CA

Built 1958 Load: 12.6 t ADT: 26,985

BROAD ST

Over: STENNER CREEK

AT RTE 101, San Luis Obispo, CA

Built 1909 Load: 14.6 t ADT: 4,496

BEACHCOMBER DR

Over: BEACH CREEK

0.3 MI SE OF RTE 1, San Luis Obispo, CA

Built 1925 Load: 14.9 t ADT: 339

NIPOMO ST

Over: STENNER CREEK

WEST OF PEACH ST, San Luis Obispo, CA

Built 1922 Load: 14.9 t ADT: 2,549

HOSPITAL DRIVE

Over: ATASCADERO CREEK

0.1MI SW INTXCAPISTRANO, San Luis Obispo, CA

Built 1921 Load: 14.9 t ADT: 2,700

NACIMIENTO LAKE DR

Over: LAKE NACIMIENTO DAM SPWY

15 MI NW OF SR 101, San Luis Obispo, CA

Built 1956 Load: 15.2 t ADT: 1,772

CALIFORNIA BLVD

Over: SAN LUIS OBISPO CREEK

W SAN LUIS BAY DR, San Luis Obispo, CA

Built 1935 Load: 15.2 t ADT: 16,437

S CHORRO ST

Over: STENNER CREEK

SLO CTY, San Luis Obispo, CA

Built 1935 Load: 15.2 t ADT: 7,735

BROAD ST

Over: SAN LUIS OBISPO CREEK

0.1 MI NORTH OF HIGUERA, San Luis Obispo, CA

Built 1911 Load: 15.6 t ADT: 3,000

MORRO ST

Over: SAN LUIS OBISPO CREEK

JUST W OF HIGUERA, San Luis Obispo, CA

Built 1925 Load: 15.6 t ADT: 3,000

EQUIPMENT SHOP RD

Over: STENNER CREEK

.1KM W OF MT BISHOP RD, San Luis Obispo, CA

Built 1947 Load: 15.6 t ADT: 50

KLAU MINE RD

Over: LAS TABLAS CREEK

2.7 MI SW ADELAIDA, San Luis Obispo, CA

Built 1940 Load: 15.9 t ADT: 93

MAIN ST

Over: MORRO CREEK

0.15 MI S OF RTE 41, San Luis Obispo, CA

Built 1921 Load: 15.9 t ADT: 8,500

HI MOUNTAIN RD

Over: ARROYO GRANDE CREEK

1.5 MI E LOPEZ CYN RD, San Luis Obispo, CA

Built 1965 Load: 16.8 t ADT: 50

CAYUCOS CR RD

Over: CAYUCOS CREEK

THUNDER CANYON RD, San Luis Obispo, CA

Built 1928 Load: 16.8 t ADT: 276

THOMPSON RD

Over: DELEISSIGUES CREEK

0.75 MI NW TEFFT ST, San Luis Obispo, CA

Built 1916 Load: 16.8 t ADT: 5,834

BUCKLEY RD

Over: E BR SAN LUIS OBISPO CRK

0.5 MI S HIGUERA ST, San Luis Obispo, CA

Built 1915 Load: 17.2 t ADT: 4,717

HUASNA RD

Over: WEST BRANCH HUASNA CREEK

HUASNA TOWNSITE RD, San Luis Obispo, CA

Built 1930 Load: 17.2 t ADT: 401

TASSAJARA CR RD

Over: SANTA MARGARITA CREEK

WEST OF RTE 101, San Luis Obispo, CA

Built 1940 Load: 17.2 t ADT: 228

SANTA FE ROAD

Over: BR SAN LUIS OBISPO CREEK

1.6 MI N. OF BUCKLEY ROAD, San Luis Obispo, CA

Built 1920 Load: 17.2 t ADT: 1,311

Read our methodology — how this data is sourced, computed, and verified.

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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