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)

US HIGHWAY 101

Unknown

Over: COLLEGE AVENUE

04-SON-101-20.74-SRO, Sonoma, CA

Built 2009 ADT: 34,300

US HIGHWAY 101 SB

Unknown

Over: SR 116 & NWP RR & DITCH

04-SON-101-3.65-PET, Sonoma, CA

Built 2007 ADT: 31,750

US HIGHWAY 101 NB

Unknown

Over: SR 116, RR TRACKS, DITCH

04-SON-101-3.60-PET, Sonoma, CA

Built 2015 ADT: 31,750

US HIGHWAY 101

Unknown

Over: WILFRED AV-GOLFCOURSE DR

04-SON-101-14.89-RNPK, Sonoma, CA

Built 2012 ADT: 33,160

SB101-GOLF CRS OFF

Unknown

Over: COMMERCE BLVD & NWPRR

04-SON-101-15.07-RNPK, Sonoma, CA

Built 2012 ADT: 11,000

US HIGHWAY 101

Unknown

Over: WEST RAILROAD AVENUE

04-SON-101-10.67, Sonoma, CA

Built 2011 ADT: 4,000

US HIGHWAY 101

Unknown

Over: SR 116 GRAVENSTEIN HWY

04-SON-101-12.70-COTI, Sonoma, CA

Built 2011 ADT: 22,500

OLD REDWOOD HWY N

Unknown

Over: US HIGHWAY 101

04-SON-101-7.65-PET, Sonoma, CA

Built 2014 ADT: 94,000

KASTANIA ROAD

Unknown

Over: US HIGHWAY 101

04-SON-101-2.60-PET, Sonoma, CA

Built 2014 ADT: 76,000

US HIGHWAY 101

Unknown

Over: PETALUMA RIVER

04-SON-101-3.23-PET, Sonoma, CA

Built 2016 ADT: 10,000

AIRPORT BLVD

Unknown

Over: US HIGHWAY 101

04-SON-101-26.30, Sonoma, CA

Built 2014 ADT: 62,000

US HIGHWAY 101

Unknown

Over: STEELE LANE

04-SON-101-21.74-SRO, Sonoma, CA

Built 2009 ADT: 150,000

NCRRA/NWP RR

Unknown

Over: OLD REDWOOD HWY

32.2 MI N MARIN LINE, Sonoma, CA

Built 1915 ADT: 5,900

GRAPE VINES

Unknown

Over: MARK WEST SPRINGS ROAD

4.9 MI NE INTX OLD RD HY, Sonoma, CA

Built 1975 ADT: 10,000

BICENTENNIAL WAY

Unknown

Over: FOUNTAINGROVE PARKWAY

0.5 MI E OF RTE 101, Sonoma, CA

Built 1985 ADT: 1,000

FOUNTAIN GROVE PKW

Unknown

Over: CHANATE ROAD

AT CHANATE ROAD, Sonoma, CA

Built 1997 ADT: 1,200

FOUNTAIN GROVE PKW

Unknown

Over: CHANATE ROAD

AT CHANATE ROAD, Sonoma, CA

Built 1997 ADT: 1,200

OLD CAZADERO RD

Fair

Over: AUSTIN CREEK

AT CAZADERO HWY, Sonoma, CA

Built 1940 Load: 10.0 t ADT: 60

ARNOLD DRIVE

Fair

Over: SONOMA CREEK

7.6 MI NORTH OF SR 116, Sonoma, CA

Built 1930 Load: 11.7 t ADT: 13,900

STATE ROUTE 116

Fair

Over: JONES CREEK

04-SON-116-19.90, Sonoma, CA

Built 1921 Load: 13.0 t ADT: 12,400

WATMAUGH ROAD

Fair

Over: SONOMA CREEK

0.3 MI WEST OF SR 12, Sonoma, CA

Built 1929 Load: 13.3 t ADT: 3,628

WOHLER RD

Fair

Over: RUSSIAN RIVER

1.5 MI FROM RIVER RD, Sonoma, CA

Built 1921 Load: 14.3 t ADT: 828

SR 12

Fair

Over: AGUA CALIENTE CREEK

04-SON-012-35.75, Sonoma, CA

Built 1924 Load: 14.6 t ADT: 18,600

VERANO AVE

Fair

Over: SONOMA CREEK

0.7 MI E ARNOLD DR, Sonoma, CA

Built 1949 Load: 14.6 t ADT: 9,700

CHASE ST

Fair

Over: NATHANSON CREEK

0.1 MI E SR 12 SONOMA, Sonoma, CA

Built 1910 Load: 14.6 t ADT: 600

SOUTH E ST

Fair

Over: MATANZAS CREEK

BETWN TUPPER & SONOMA AVE, Sonoma, CA

Built 1935 Load: 14.9 t ADT: 11,100

4TH ST EAST

Fair

Over: NATHANSON CREEK

0.1 MI N OF E NAPA ST, Sonoma, CA

Built 1914 Load: 15.2 t ADT: 2,100

ALEXANDER VALLEY R

Fair

Over: RUSSIAN RIVER - JIMTOWN

NORTH OF HEALDSBURG, Sonoma, CA

Built 1949 Load: 15.6 t ADT: 3,300

WATMAUGH ROAD

Fair

Over: NATHANSON CREEK

0.5 MI E SR 12, Sonoma, CA

Built 1920 Load: 15.6 t ADT: 1,000

NEELEY ROAD

Fair

Over: HILLSIDE

1.1 MI W S.H. 116, Sonoma, CA

Built 1930 Load: 15.6 t ADT: 3,000

FRANCE ST

Fair

Over: NATHANSON CREEK

0.1 MI E SR 12 SONOMA, Sonoma, CA

Built 1918 Load: 15.6 t ADT: 750

PETALUMA BLVD N

Fair

Over: PETALUMA RIVER

0.2 MI S JCT US 101, Sonoma, CA

Built 1940 Load: 15.9 t ADT: 4,200

SALMON CREEK RD

Fair

Over: TANNERY CREEK

0.12 MI W TANNERY CRK RD, Sonoma, CA

Built 1920 Load: 15.9 t ADT: 100

2ND STREET

Fair

Over: NATHANSON CREEK

.02 MI SO. OF E. NAPA ST, Sonoma, CA

Built 1909 Load: 15.9 t ADT: 820

VALLEY FORD RD

Fair

Over: STEMPLE CREEK

7.5 MI INTERSECTION SR 1, Sonoma, CA

Built 1915 Load: 16.2 t ADT: 3,100

BODEGA HWY

Fair

Over: NOLAN CREEK

1.2 MI NE INTX SR 1, Sonoma, CA

Built 1955 Load: 16.2 t ADT: 6,400

DRY CRK CANYON RD

Fair

Over: LYTTON SPRINGS CREEK

INTERSECTION LYTTON RD, Sonoma, CA

Built 1935 Load: 16.2 t ADT: 2,800

W COLLEGE AVE

Fair

Over: COLLEGE CREEK

0.05 MI W MARLOW RD, Sonoma, CA

Built 1935 Load: 16.2 t ADT: 26,000

WARM SPRINGS RD

Fair

Over: YULUPA CREEK

11.15 MI N OF S.H. 116, Sonoma, CA

Built 1930 Load: 16.2 t ADT: 2,700

OAK ST

Fair

Over: DOWDALL CREEK

0.1 MI W/O RIVERSIDE DR, Sonoma, CA

Built 1940 Load: 16.2 t ADT: 350

O'DONNELL LANE

Fair

Over: CALABAZAS CREEK

NEAR ARNOLD DRIVE, Sonoma, CA

Built 1900 Load: 16.2 t ADT: 500

FAUGHT ROAD

Fair

Over: PRUITT CREEK

0.3 MI N OF E SHILOH RD, Sonoma, CA

Built 1935 Load: 16.2 t ADT: 2,900

ARNOLD DR

Fair

Over: STEWART CREEK

0.4 MI S JCT SR 12, Sonoma, CA

Built 1928 Load: 16.2 t ADT: 3,700

GEYSERS RD

Fair

Over: FRASIER CREEK

20.4 MI N OF SR 128, Sonoma, CA

Built 1941 Load: 16.5 t ADT: 250

LAUGHLIN RD

Fair

Over: MARK WEST CREEK

1 MI N OF RIVER RD, Sonoma, CA

Built 1910 Load: 16.5 t ADT: 2,338

OLD REDWOOD HWY

Fair

Over: SOTOYOME CREEK

0.7 MI SE EASTSIDE RD, Sonoma, CA

Built 1913 Load: 16.8 t ADT: 5,900

STWRT PT-SKGG SPRG

Fair

Over: SHINGLE MILL CR (OHLSON)

14.3 MI SR 1 VIA ANPLS RD, Sonoma, CA

Built 1935 Load: 16.8 t ADT: 300

WARM SPRINGS RD

Fair

Over: CALABAZAS CREEK

NEAR ARNOLD DR, Sonoma, CA

Built 1928 Load: 16.8 t ADT: 3,000

FULTON RD

Fair

Over: MARK WEST CREEK

0.2 MI N OF US HWY 101, Sonoma, CA

Built 1971 Load: 16.8 t ADT: 14,650

CANYON RD

Fair

Over: CANYON CREEK

0.4 MI E JCT DRY CREEK RD, Sonoma, CA

Built 1928 Load: 16.8 t ADT: 416

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