Sonoma County, CA

613 public highway bridges

Sonoma County Bridge Snapshot

Sonoma County, California contains 613 public highway bridges in the FHWA National Bridge Inventory. Roughly 22.2% are rated “Good,” 60.8% “Fair,” 6% “Poor,” and 6% 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.

613

Total Bridges

22.2%

Good

6%

Poor

6%

Structurally Deficient

Condition Distribution

Good

22.2% (136)

Fair

60.8% (373)

Poor

6% (37)

SD

6% (37)

All Bridges (613)

Sort:

GEYSERS ROAD

Over: HILLSIDE

1.0 MI E/O BIG SULPHUR CR, Sonoma, CA

Built 2006 Load: 34.3 t ADT: 150

S101-WASHINGTON

Over: WASHINGTON STREET CREEK

04-SON-101-4.80-PET, Sonoma, CA

Built 1955 Load: 34.7 t ADT: 3,400

STATE ROUTE 12

Over: DUTTON AVE

04-SON-012-R15.30, Sonoma, CA

Built 1964 Load: 34.7 t ADT: 36,500

STATE ROUTE 12

Over: DUTTON AVE

04-SON-012-R15.30, Sonoma, CA

Built 1964 Load: 34.7 t ADT: 36,500

STATE ROUTE 12

Over: BRIGHAM AVE

04-SON-012-R17.10-SRO, Sonoma, CA

Built 1969 Load: 34.7 t ADT: 30,000

STATE ROUTE 12

Over: MATANZAS CREEK

04-SON-012-T17.77-SRO, Sonoma, CA

Built 1968 Load: 34.7 t ADT: 40,750

TALBOT AVE

Over: SANTA ROSA CREEK

JUST S INTRX WITH 4TH AVE, Sonoma, CA

Built 1953 Load: 34.7 t ADT: 1,000

GEYSERS RD

Over: BIG SULPHUR CREEK

18.6 MI N OF SH 128, Sonoma, CA

Built 1909 Load: 35.0 t ADT: 140

LAUGHLIN RD

Over: FIFE CREEK

0.1 MI W ARMSTRONG WDS RD, Sonoma, CA

Built 1956 Load: 35.0 t ADT: 602

PLEASANT AVE

Over: POOL CREEK

0.8 MI E OF OLD REDWOOD H, Sonoma, CA

Built 1925 Load: 35.0 t ADT: 2,000

FERGUSON RD

Over: JONIVE CREEK

0.15 MI N BODEGA HWY, Sonoma, CA

Built 1962 Load: 35.0 t ADT: 1,200

HIGHLAND TERRACE

Over: HILLSIDE

AT MESA WY, Sonoma, CA

Built 1983 Load: 35.0 t ADT: 100

MILL STATION RD

Over: ATASCADERO CREEK

0.25 MI E FERGUSON RD, Sonoma, CA

Built 1964 Load: 35.6 t ADT: 1,450

FELTA RD

Over: FELTA CREEK

0.3 MI W OF WESTSIDE RD, Sonoma, CA

Built 1975 Load: 35.6 t ADT: 50

SUMMERHOME PARK RD

Over: HILLSIDE

0.85 MI SW RIVER RD, Sonoma, CA

Built 1930 Load: 35.6 t ADT: 101

AGUA CALIENTE RD

Over: SONOMA CREEK

0.4 MI W HWY 12, Sonoma, CA

Built 1954 Load: 36.3 t ADT: 4,300

MOSCOW RD

Over: HILLSIDE

0.2 MI NW MAIN, Sonoma, CA

Built 1956 Load: 36.3 t ADT: 825

WESTSIDE ROAD

Over: FOREMAN LANE

OVER FORMAN LANE, Sonoma, CA

Built 1961 Load: 36.6 t ADT: 3,200

LEVERONI RD

Over: CARRIGER CREEK

1.05 MI W OF SR 12, Sonoma, CA

Built 1972 Load: 36.6 t ADT: 6,000

WILLOW CREEK ROAD

Over: WILLOW CREEK

2.4 MI E/O RTE 1, Sonoma, CA

Built 1975 Load: 36.6 t ADT: 120

STWRT PT-SKGG SPRG

Over: HILLSIDE

8.5 MI E/O SR 1, Sonoma, CA

Built 2011 Load: 36.6 t ADT: 300

CAZADERO HWY

Over: HILLSIDE

3.6 MI N/O SR 116, Sonoma, CA

Built 2011 Load: 36.6 t ADT: 1,450

ELY RD

Over: WILLOW BROOK

0.1 MI SE OLD RDWD HWY N, Sonoma, CA

Built 1959 Load: 36.9 t ADT: 3,500

PEPPER RD

Over: STEMPLE CREEK

1.2 MI N OF BODEGA AVE, Sonoma, CA

Built 1968 Load: 36.9 t ADT: 3,500

RAINSVILLE ROAD

Over: WILLOW BRK (PETALUMA RV)

0.1 MI SW STONY POINT RD, Sonoma, CA

Built 1960 Load: 36.9 t ADT: 3,200

MONTE VISTA TER

Over: HILLSIDE

IN MONTE RIO, Sonoma, CA

Built 1960 Load: 36.9 t ADT: 200

STATE ROUTE 121

Over: SONOMA CREEK

04-SON-121-R7.30, Sonoma, CA

Built 1971 Load: 37.3 t ADT: 19,000

US HIGHWAY 101 SB

Over: WASHINGTON STREET CREEK

04-SON-101-4.77-PET, Sonoma, CA

Built 1955 Load: 37.3 t ADT: 43,000

OLD MONTE RIO ROAD

Over: HILLSIDE

BTWN SANTA ROSA & DUNCAN, Sonoma, CA

Built 2012 Load: 37.3 t ADT: 100

FORT ROSS ROAD

Over: HILLSIDE

1.7 MI W/O KINGS RIDGE RD, Sonoma, CA

Built 2014 Load: 37.3 t ADT: 200

STATE ROUTE 121

Over: ARROYO SECO

04-SON-121-8.43, Sonoma, CA

Built 1923 Load: 37.6 t ADT: 19,000

SLUSSER RD

Over: MARK WEST CREEK

0.2 MI N OF RIVER RD, Sonoma, CA

Built 1986 Load: 37.6 t ADT: 3,242

GRATON RD

Over: PURRINGTON CREEK

0.1 MI N/E GREENHILL RD, Sonoma, CA

Built 1970 Load: 37.9 t ADT: 3,100

STWRT PT-SKGG SPRG

Over: HILLSIDE

9.7 MI E/O SR 1, Sonoma, CA

Built 1970 Load: 37.9 t ADT: 300

BELLEVUE AVE

Over: COLGAN CR FLD CNTRL CHNL

0.3 MI E STONY POINT RD, Sonoma, CA

Built 1964 Load: 37.9 t ADT: 400

MONTE VISTA TER

Over: HILLSIDE

IN MONTE RIO, Sonoma, CA

Built 1968 Load: 37.9 t ADT: 200

PIERSON ST

Over: SANTA ROSA CREEK

0.2 MI N/O WEST 3RD ST, Sonoma, CA

Built 1960 Load: 38.2 t ADT: 500

STWRT PT-SKGG SPRG

Over: HILLSIDE

2.77 MI E OF ST HWY 1, Sonoma, CA

Built 2015 Load: 38.2 t ADT: 200

STWRT PT-SKGG SPRG

Over: HILLSIDE

2.8 MI E OF ST HWY 1, Sonoma, CA

Built 2015 Load: 38.2 t ADT: 200

KENILWORTH AVE

Over: SONOMA CREEK

0.1 MI W MERWIN AVE, Sonoma, CA

Built 1971 Load: 38.6 t ADT: 100

US HIGHWAY 101 NB

Over: CITRUS FAIR DRIVE

04-SON-101-R51.62-CLVD, Sonoma, CA

Built 1994 Load: 38.9 t ADT: 6,800

SANTA ROSA AVE

Over: SANTA ROSA CREEK

BETWN SONOMA AVE-FIRST ST, Sonoma, CA

Built 1928 Load: 38.9 t ADT: 31,300

VACATION BEACH RD

Over: RUSSIAN RIV SUMMER XING

JUST NE OF SR 116, Sonoma, CA

Built 1977 Load: 38.9 t ADT: 600

ODD FELLOWS PARK R

Over: RUSSIAN RIV SUMMER XING

REMOVED AT HIGH WATER, Sonoma, CA

Built 1977 Load: 38.9 t ADT: 275

WESTSIDE RD

Over: NORTON SLOUGH

W OF SR 101 AT HEALDSBRG, Sonoma, CA

Built 1960 Load: 39.2 t ADT: 6,100

MILL CREEK RD

Over: MILL CREEK

5.6 MI W WESTSIDE RD, Sonoma, CA

Built 1960 Load: 39.2 t ADT: 210

KING RIDGE RD

Over: BIG AUSTIN CREEK

2.3 MI N FORT ROSS RD, Sonoma, CA

Built 1965 Load: 39.2 t ADT: 200

YOAKIM BRIDGE RD

Over: DRY CREEK

0.3 MI SW DRY CREEK ROAD, Sonoma, CA

Built 1956 Load: 39.5 t ADT: 800

US HIGHWAY 101

Over: PRUITT CREEK

04-SON-101-27.39, Sonoma, CA

Built 1962 Load: 39.9 t ADT: 62,000

US HIGHWAY 101 NB

Over: POOL CREEK

04-SON-101-27.97, Sonoma, CA

Built 1962 Load: 40.2 t ADT: 62,000

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 6, 2026