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)

ESTRELLA ROAD

Fair

Over: ESTRELLA RIVER

AT ESTRELLA RD, San Luis Obispo, CA

Built 1978 Load: 58.6 t ADT: 249

VINEYARD DR

Fair

Over: SALINAS RIVER

0.3 MI E OF U.S. 101, San Luis Obispo, CA

Built 1977 Load: 65.4 t ADT: 4,119

PREFUMO CANYON RD

Fair

Over: PREFUMO CANYON CREEK

2.0 MI W LOS OSOS VLLY RD, San Luis Obispo, CA

Built 1974 Load: 75.2 t ADT: 300

QUAILWOOD LANE

Good

Over: LOS BERROS CREEK

BY LOS BERROS ROAD, San Luis Obispo, CA

Built 1932 Load: 15.2 t ADT: 10

MAIN ST

Good

Over: TEMPLETON CREEK

0.35 MI SOUTH RAMADA DR, San Luis Obispo, CA

Built 1929 Load: 16.2 t ADT: 6,836

MAIN ST

Good

Over: NORTH FORK TEMPLETON CRK

0.3 MI SOUTH RAMADA DR, San Luis Obispo, CA

Built 1929 Load: 16.2 t ADT: 6,836

ADOBE ROAD

Good

Over: SAN LUISITO CREEK

0.1 MI W. OF SAN LUISITO, San Luis Obispo, CA

Built 1948 Load: 16.2 t ADT: 101

US HIGHWAY 101 SB

Good

Over: SAN LUIS OBISPO CREEK

05-SLO-101-R21.49, San Luis Obispo, CA

Built 1948 Load: 17.8 t ADT: 31,000

US HIGHWAY 101 NB

Good

Over: NIPOMO CREEK

05-SLO-101-1.36, San Luis Obispo, CA

Built 1957 Load: 19.1 t ADT: 28,000

US HIGHWAY 101 NB

Good

Over: ARROYO GRANDE CREEK

05-SLO-101-13.02-ARGD, San Luis Obispo, CA

Built 1959 Load: 19.8 t ADT: 24,000

STATE ROUTE 46

Good

Over: JACK CREEK (PSO RBLS CR)

05-SLO-046-R15.85, San Luis Obispo, CA

Built 1969 Load: 20.1 t ADT: 4,600

STATE ROUTE 46

Good

Over: CHOLAME CREEK

05-SLO-046-50.66, San Luis Obispo, CA

Built 1941 Load: 20.4 t ADT: 14,000

SANTA ROSA CR RD

Good

Over: SANTA ROSA CREEK

3.0 MI W CYPRESS MTN DR, San Luis Obispo, CA

Built 1947 Load: 21.1 t ADT: 128

US HIGHWAY 101 NB

Good

Over: LOS BERROS CREEK

05-SLO-101-8.52, San Luis Obispo, CA

Built 1932 Load: 22.0 t ADT: 25,500

US HIGHWAY 101 SB

Good

Over: GRAVES CREEK

05-SLO-101-49.40, San Luis Obispo, CA

Built 1951 Load: 22.4 t ADT: 31,000

SANTA ROSA CR RD

Good

Over: ROCKY CREEK

1.0 MI NW SR 46, San Luis Obispo, CA

Built 1948 Load: 22.7 t ADT: 1,204

US HIGHWAY 101 NB

Good

Over: PASO ROBLES CREEK

05-SLO-101-49.64, San Luis Obispo, CA

Built 1939 Load: 23.7 t ADT: 31,000

LAS PILITAS RD

Good

Over: PILITAS CREEK

2.4 MI E SANTA MARG RD, San Luis Obispo, CA

Built 1930 Load: 24.0 t ADT: 189

U.S. HIGHWAY 101

Good

Over: SANTA MARGARITA CREEK

05-SLO-101-36.58, San Luis Obispo, CA

Built 1916 Load: 24.3 t ADT: 43,000

I STREET

Good

Over: YERBA BUENA CREEK

0.05 MI S/W OF S.R. 58, San Luis Obispo, CA

Built 1950 Load: 24.3 t ADT: 100

ESTRELLA RD

Good

Over: RANCHITA CANYON CREEK

0.5 MI E PLEASANT RD, San Luis Obispo, CA

Built 1940 Load: 24.3 t ADT: 529

PREFUMO CANYON RD

Good

Over: PREFUMO CANYON CREEK

0.9 MI SW LOS OSOS VLY RD, San Luis Obispo, CA

Built 1969 Load: 24.3 t ADT: 300

EL CAMINO REAL

Good

Over: E BRA ATASCADERO CRK

0.12 MI SE OF SR 41, San Luis Obispo, CA

Built 1965 Load: 24.3 t ADT: 10,200

ATASCADERO ROAD

Good

Over: EAGLE CREEK

.1 MI E OF SA. BARBARA RD, San Luis Obispo, CA

Built 2005 Load: 24.9 t ADT: 150

STATE ROUTE 1

Good

Over: OLD CREEK ROAD

05-SLO-001-R34.91, San Luis Obispo, CA

Built 1965 Load: 25.3 t ADT: 9,000

WINDSOR BLVD

Good

Over: SANTA ROSA CREEK

200' SOUTH OF SR 1, San Luis Obispo, CA

Built 1963 Load: 26.2 t ADT: 3,416

FERROCARRIL RD

Good

Over: GRAVES CREEK

0.1 MI W/O EL CAMINO REAL, San Luis Obispo, CA

Built 2005 Load: 26.2 t ADT: 1,500

EL CAMINO REAL

Good

Over: UP RR & AMTRAK

0.1 MI N/O SAN RAMON RD, San Luis Obispo, CA

Built 2005 Load: 26.2 t ADT: 450

SAN LUIS BAY DR

Good

Over: SEE CANYON CREEK

0.9 MI W OF US 101, San Luis Obispo, CA

Built 1940 Load: 26.9 t ADT: 6,830

US HIGHWAY 101 SB

Good

Over: SPYGLASS ROAD

05-SLO-101-R19.81, San Luis Obispo, CA

Built 1964 Load: 27.2 t ADT: 29,250

US HIGHWAY 101 NB

Good

Over: SPYGLASS ROAD

05-SLO-101-R19.81, San Luis Obispo, CA

Built 1964 Load: 27.2 t ADT: 29,250

LAKEVIEW DR

Good

Over: LAS TABLAS CREEK

3.8 MI N CHIMNEY ROCK RD, San Luis Obispo, CA

Built 1959 Load: 27.2 t ADT: 260

STATE ROUTE 227

Good

Over: EAST FORK PISMO CREEK

05-SLO-227-5.26, San Luis Obispo, CA

Built 1966 Load: 28.2 t ADT: 3,550

STATE ROUTE 227

Good

Over: WEST CORRAL DE PIEDRA CR

05-SLO-227-R7.34, San Luis Obispo, CA

Built 1971 Load: 28.2 t ADT: 11,500

LOS OSOS VALLEY RD

Good

Over: LOS OSOS CREEK

LOS OSOS VALLEY ROAD, San Luis Obispo, CA

Built 1991 Load: 28.5 t ADT: 16,105

US HIGHWAY 101 NB

Good

Over: SAN LUIS OBISPO CREEK

05-SLO-101-R21.49, San Luis Obispo, CA

Built 1940 Load: 29.2 t ADT: 31,000

STATE ROUTE 1

Good

Over: MORRO CREEK

05-SLO-001-30.00, San Luis Obispo, CA

Built 1962 Load: 29.2 t ADT: 24,000

STATE ROUTE 1

Good

Over: SANTA ROSA CREEK

05-SLO-001-49.89, San Luis Obispo, CA

Built 1963 Load: 29.2 t ADT: 6,000

US HIGHWAY 101 SB

Good

Over: LOS BERROS CREEK

05-SLO-101-8.52, San Luis Obispo, CA

Built 1956 Load: 29.8 t ADT: 25,500

BRIDGE STREET

Good

Over: ARROYO GRANDE CREEK

0.1 MI S OF STATE RTE 227, San Luis Obispo, CA

Built 2021 Load: 29.8 t ADT: 4,000

STATE ROUTE 1 SB

Good

Over: OLD CREEK

05-SLO-001-34.46, San Luis Obispo, CA

Built 1961 Load: 30.1 t ADT: 6,250

RIVER GROVE DR

Good

Over: ESTRELLA RIVER

0.15 MI E OF ESTRELLA RD, San Luis Obispo, CA

Built 1910 Load: 30.5 t ADT: 100

US HIGHWAY 101 SB

Good

Over: UP RR, AMTRAK, SPRING ST

05-SLO-101-58.76-PSRS, San Luis Obispo, CA

Built 1958 Load: 31.4 t ADT: 11,500

US HIGHWAY 101 NB

Good

Over: UP RR, AMTRAK, SPRING ST

05-SLO-101-58.76-PSRS, San Luis Obispo, CA

Built 1958 Load: 31.4 t ADT: 11,500

US HIGHWAY 101 SB

Good

Over: UP RR & AMTRAK, MISSION

05-SLO-101-R67.71, San Luis Obispo, CA

Built 1965 Load: 32.1 t ADT: 9,000

US HIGHWAY 101 NB

Good

Over: UP RR & AMTRAK, MISSION

05-SLO-101-R67.71, San Luis Obispo, CA

Built 1965 Load: 32.1 t ADT: 9,000

STATE ROUTE 166

Good

Over: CUYAMA RIVER

05-SLO-166-R51.02, San Luis Obispo, CA

Built 1980 Load: 32.4 t ADT: 2,900

STATE ROUTE 1

Good

Over: LITTLE PICO CREEK

05-SLO-001-56.34, San Luis Obispo, CA

Built 1991 Load: 32.4 t ADT: 5,300

STATE ROUTE 41

Good

Over: ATASCADERO CREEK

05-SLO-041-13.05-ATAS, San Luis Obispo, CA

Built 1990 Load: 32.4 t ADT: 9,700

STATE ROUTE 41

Good

Over: ATASCADERO CREEK

05-SLO-041-13.18-ATAS, San Luis Obispo, CA

Built 1990 Load: 32.4 t ADT: 9,700

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