Sonoma County, CA

613 public highway bridges

Sonoma County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Sonoma County, California contains 613 public highway bridges. Roughly 22.2% are rated “Good,” 60.8% “Fair,” and 6% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

613
Total Bridges
22.2%
Good
60.8%
Fair
6%
Poor Condition

Condition Distribution

Good
22.2% (136)
Fair
60.8% (373)
Poor
6% (37)

All Bridges (613)

GEYSERS ROAD

Fair

Over: HILLSIDE

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

Built 2006 Load: 34.3 t ADT: 150

S101-WASHINGTON

Fair

Over: WASHINGTON STREET CREEK

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

Built 1955 Load: 34.7 t ADT: 3,400

STATE ROUTE 12

Fair

Over: DUTTON AVE

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

Built 1964 Load: 34.7 t ADT: 36,500

STATE ROUTE 12

Fair

Over: DUTTON AVE

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

Built 1964 Load: 34.7 t ADT: 36,500

STATE ROUTE 12

Fair

Over: BRIGHAM AVE

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

Built 1969 Load: 34.7 t ADT: 30,000

STATE ROUTE 12

Fair

Over: MATANZAS CREEK

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

Built 1968 Load: 34.7 t ADT: 40,750

TALBOT AVE

Fair

Over: SANTA ROSA CREEK

JUST S INTRX WITH 4TH AVE, Sonoma, CA

Built 1953 Load: 34.7 t ADT: 1,000

GEYSERS RD

Fair

Over: BIG SULPHUR CREEK

18.6 MI N OF SH 128, Sonoma, CA

Built 1909 Load: 35.0 t ADT: 140

LAUGHLIN RD

Fair

Over: FIFE CREEK

0.1 MI W ARMSTRONG WDS RD, Sonoma, CA

Built 1956 Load: 35.0 t ADT: 602

PLEASANT AVE

Fair

Over: POOL CREEK

0.8 MI E OF OLD REDWOOD H, Sonoma, CA

Built 1925 Load: 35.0 t ADT: 2,000

FERGUSON RD

Fair

Over: JONIVE CREEK

0.15 MI N BODEGA HWY, Sonoma, CA

Built 1962 Load: 35.0 t ADT: 1,200

HIGHLAND TERRACE

Fair

Over: HILLSIDE

AT MESA WY, Sonoma, CA

Built 1983 Load: 35.0 t ADT: 100

MILL STATION RD

Fair

Over: ATASCADERO CREEK

0.25 MI E FERGUSON RD, Sonoma, CA

Built 1964 Load: 35.6 t ADT: 1,450

FELTA RD

Fair

Over: FELTA CREEK

0.3 MI W OF WESTSIDE RD, Sonoma, CA

Built 1975 Load: 35.6 t ADT: 50

SUMMERHOME PARK RD

Fair

Over: HILLSIDE

0.85 MI SW RIVER RD, Sonoma, CA

Built 1930 Load: 35.6 t ADT: 101

AGUA CALIENTE RD

Fair

Over: SONOMA CREEK

0.4 MI W HWY 12, Sonoma, CA

Built 1954 Load: 36.3 t ADT: 4,300

MOSCOW RD

Fair

Over: HILLSIDE

0.2 MI NW MAIN, Sonoma, CA

Built 1956 Load: 36.3 t ADT: 825

WESTSIDE ROAD

Fair

Over: FOREMAN LANE

OVER FORMAN LANE, Sonoma, CA

Built 1961 Load: 36.6 t ADT: 3,200

LEVERONI RD

Fair

Over: CARRIGER CREEK

1.05 MI W OF SR 12, Sonoma, CA

Built 1972 Load: 36.6 t ADT: 6,000

WILLOW CREEK ROAD

Fair

Over: WILLOW CREEK

2.4 MI E/O RTE 1, Sonoma, CA

Built 1975 Load: 36.6 t ADT: 120

STWRT PT-SKGG SPRG

Fair

Over: HILLSIDE

8.5 MI E/O SR 1, Sonoma, CA

Built 2011 Load: 36.6 t ADT: 300

CAZADERO HWY

Fair

Over: HILLSIDE

3.6 MI N/O SR 116, Sonoma, CA

Built 2011 Load: 36.6 t ADT: 1,450

ELY RD

Fair

Over: WILLOW BROOK

0.1 MI SE OLD RDWD HWY N, Sonoma, CA

Built 1959 Load: 36.9 t ADT: 3,500

PEPPER RD

Fair

Over: STEMPLE CREEK

1.2 MI N OF BODEGA AVE, Sonoma, CA

Built 1968 Load: 36.9 t ADT: 3,500

RAINSVILLE ROAD

Fair

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

Fair

Over: HILLSIDE

IN MONTE RIO, Sonoma, CA

Built 1960 Load: 36.9 t ADT: 200

STATE ROUTE 121

Fair

Over: SONOMA CREEK

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

Built 1971 Load: 37.3 t ADT: 19,000

US HIGHWAY 101 SB

Fair

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

Fair

Over: HILLSIDE

BTWN SANTA ROSA & DUNCAN, Sonoma, CA

Built 2012 Load: 37.3 t ADT: 100

FORT ROSS ROAD

Fair

Over: HILLSIDE

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

Built 2014 Load: 37.3 t ADT: 200

STATE ROUTE 121

Fair

Over: ARROYO SECO

04-SON-121-8.43, Sonoma, CA

Built 1923 Load: 37.6 t ADT: 19,000

SLUSSER RD

Fair

Over: MARK WEST CREEK

0.2 MI N OF RIVER RD, Sonoma, CA

Built 1986 Load: 37.6 t ADT: 3,242

GRATON RD

Fair

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

Fair

Over: HILLSIDE

9.7 MI E/O SR 1, Sonoma, CA

Built 1970 Load: 37.9 t ADT: 300

BELLEVUE AVE

Fair

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

Fair

Over: HILLSIDE

IN MONTE RIO, Sonoma, CA

Built 1968 Load: 37.9 t ADT: 200

PIERSON ST

Fair

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

Fair

Over: HILLSIDE

2.77 MI E OF ST HWY 1, Sonoma, CA

Built 2015 Load: 38.2 t ADT: 200

STWRT PT-SKGG SPRG

Fair

Over: HILLSIDE

2.8 MI E OF ST HWY 1, Sonoma, CA

Built 2015 Load: 38.2 t ADT: 200

KENILWORTH AVE

Fair

Over: SONOMA CREEK

0.1 MI W MERWIN AVE, Sonoma, CA

Built 1971 Load: 38.6 t ADT: 100

US HIGHWAY 101 NB

Fair

Over: CITRUS FAIR DRIVE

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

Built 1994 Load: 38.9 t ADT: 6,800

SANTA ROSA AVE

Fair

Over: SANTA ROSA CREEK

BETWN SONOMA AVE-FIRST ST, Sonoma, CA

Built 1928 Load: 38.9 t ADT: 31,300

VACATION BEACH RD

Fair

Over: RUSSIAN RIV SUMMER XING

JUST NE OF SR 116, Sonoma, CA

Built 1977 Load: 38.9 t ADT: 600

ODD FELLOWS PARK R

Fair

Over: RUSSIAN RIV SUMMER XING

REMOVED AT HIGH WATER, Sonoma, CA

Built 1977 Load: 38.9 t ADT: 275

WESTSIDE RD

Fair

Over: NORTON SLOUGH

W OF SR 101 AT HEALDSBRG, Sonoma, CA

Built 1960 Load: 39.2 t ADT: 6,100

MILL CREEK RD

Fair

Over: MILL CREEK

5.6 MI W WESTSIDE RD, Sonoma, CA

Built 1960 Load: 39.2 t ADT: 210

KING RIDGE RD

Fair

Over: BIG AUSTIN CREEK

2.3 MI N FORT ROSS RD, Sonoma, CA

Built 1965 Load: 39.2 t ADT: 200

YOAKIM BRIDGE RD

Fair

Over: DRY CREEK

0.3 MI SW DRY CREEK ROAD, Sonoma, CA

Built 1956 Load: 39.5 t ADT: 800

US HIGHWAY 101

Fair

Over: PRUITT CREEK

04-SON-101-27.39, Sonoma, CA

Built 1962 Load: 39.9 t ADT: 62,000

US HIGHWAY 101 NB

Fair

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 public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.