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)

AUSTIN CREEK ROAD

Fair

Over: HILLSIDE

JUST S/O KRAMER ROAD, Sonoma, CA

Built 2015 Load: 40.2 t ADT: 200

SUMMERHOME PARK RD

Fair

Over: HILLSIDE

0.95 MI SW RIVER RD, Sonoma, CA

Built 1960 Load: 40.8 t ADT: 101

BAILHACHE ROAD

Fair

Over: HILLSIDE

2 MI NE OF HEALDSBURG AVE, Sonoma, CA

Built 1985 Load: 41.8 t ADT: 700

PACIFIC AVENUE

Fair

Over: HILLSIDE

IN JENNER, Sonoma, CA

Built 2015 Load: 41.8 t ADT: 100

US HIGHWAY 101 SB

Fair

Over: GEYSERVILLE AVENUE

04-SON-101-R40.78, Sonoma, CA

Built 1975 Load: 42.4 t ADT: 13,500

SANTA ROSA AVE

Fair

Over: N BRA LAG DE SANTA ROSA

NEAR SANTA ROSA AVE., Sonoma, CA

Built 1918 Load: 42.4 t ADT: 5,000

GRATON RD

Fair

Over: ATASCADERO CREEK

0.9 MI W SH 116, Sonoma, CA

Built 1967 Load: 42.8 t ADT: 3,409

RIVER ROAD

Fair

Over: GILL CREEK

2.0 MI NW OF SR 128, Sonoma, CA

Built 1962 Load: 42.8 t ADT: 367

LAWNDALE ROAD

Fair

Over: KERN CREEK

0.6 MI S SR 12 KENWOOD, Sonoma, CA

Built 1984 Load: 42.8 t ADT: 650

PACIFIC AVENUE

Fair

Over: HILLSIDE

IN JENNER, Sonoma, CA

Built 2015 Load: 43.1 t ADT: 100

MONTECITO BLVD

Fair

Over: BRUSH CREEK

IN SANTA ROSA, Sonoma, CA

Built 1962 Load: 43.4 t ADT: 14,000

SANTA ROSA AVE

Fair

Over: HILLSIDE

1/4 MI E OLD MONTE RIO RD, Sonoma, CA

Built 1990 Load: 43.7 t ADT: 100

FORT ROSS RD.

Fair

Over: HILLSIDE

0.65MI W OF KING RIDGE RD, Sonoma, CA

Built 1999 Load: 43.7 t ADT: 200

SONOMA MTN RD

Fair

Over: HILLSIDE

1.27 MI S/O BENNETT V RD, Sonoma, CA

Built 2011 Load: 44.1 t ADT: 600

US HIGHWAY 101

Fair

Over: MARK WEST CREEK

04-SON-101-26.10, Sonoma, CA

Built 1962 Load: 44.4 t ADT: 62,000

ST HELENA ROAD

Fair

Over: HILLSIDE

4.3 MI E/O CALISTOGA RD, Sonoma, CA

Built 2007 Load: 44.4 t ADT: 2,100

MAIN ST

Fair

Over: DUTCH BILL CREEK

MONTE RIO-0.26 M FM SR116, Sonoma, CA

Built 1953 Load: 45.0 t ADT: 838

STARRETT HILL DR

Fair

Over: HILLSIDE

0.4 MI E INTX MOSCOW RD, Sonoma, CA

Built 1986 Load: 45.0 t ADT: 200

GEYSERS ROAD

Fair

Over: HILLSIDE

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

Built 2006 Load: 45.0 t ADT: 150

CALISTOGA RD

Fair

Over: MARK WEST CREEK

4.2 MI N INTERSECTN SR 12, Sonoma, CA

Built 1967 Load: 45.7 t ADT: 5,800

SR 12

Fair

Over: SANTA ROSA CREEK

04-SON-012-21.45, Sonoma, CA

Built 1974 Load: 46.0 t ADT: 41,250

E12-N&S101 CONNCTR

Fair

Over: OLIVE STREET

04-SON-012-R15.70-SRO, Sonoma, CA

Built 1964 Load: 47.6 t ADT: 47,400

ARNOLD DR

Fair

Over: CARRIGER CREEK

2.4 MI N OF SR 116, Sonoma, CA

Built 1974 Load: 48.3 t ADT: 17,700

HOEN AVENUE

Fair

Over: MATANZAS CREEK

0.1 M WEST OF CYPRESS WY, Sonoma, CA

Built 1972 Load: 49.2 t ADT: 22,000

FERN WAY

Fair

Over: HUBERT CREEK

AT OLD CAZADERO RD, Sonoma, CA

Built 1958 Load: 49.6 t ADT: 100

TODD RD

Fair

Over: LAGUNA DE SANTA ROSA

0.6 MI N JCT W/SR 116, Sonoma, CA

Built 1973 Load: 50.9 t ADT: 2,434

STATE ROUTE 128

Fair

Over: BIDWELL CREEK

04-SON-128-24.01, Sonoma, CA

Built 1977 Load: 51.8 t ADT: 2,650

RIVER RD

Fair

Over: HILLSIDE

0.1 MI E/O CANYON 7 RD., Sonoma, CA

Built 1971 Load: 53.1 t ADT: 10,300

ANNAPOLIS ROAD

Fair

Over: LITTLE FULLER CREEK

9.5 MI E/O SR 1, Sonoma, CA

Built 1976 Load: 53.1 t ADT: 400

CAZADERO HWY

Fair

Over: AUSTIN CREEK

WEST OF SR 1, Sonoma, CA

Built 1956 Load: 53.8 t ADT: 1,550

MIDDLE TERRACE

Fair

Over: HILLSIDE

JUST S STARRETT HILL DR, Sonoma, CA

Built 1980 Load: 54.1 t ADT: 200

TYRONE ROAD

Fair

Over: TYRONE GULCH CREEK

1.8 MI S/O MONTE RIO, Sonoma, CA

Built 2004 Load: 59.0 t ADT: 150

OLD CAZADERO RD

Fair

Over: HUBERT CREEK

0.9 MI NW SH 116, Sonoma, CA

Built 1955 Load: 62.2 t ADT: 950

MORELLI LANE

Fair

Over: NORTH FORK LANCEL CREEK

0.65 MI N BOHEMIAN HWY, Sonoma, CA

Built 1970 Load: 62.2 t ADT: 100

SWTWATER SPRING RD

Fair

Over: PORTER CREEK

6.1 MI W ARMSTRONG RD, Sonoma, CA

Built 1974 Load: 67.7 t ADT: 140

ANAPOLIS RD

Fair

Over: WHEATFIELD FK GUALALA RI

1.7 MI E/O SR 1, Sonoma, CA

Built 1974 Load: 74.8 t ADT: 400

RIVER BLVD

Fair

Over: MADRONE MILL CREEK

0.3 MI N BOHEMIAN HWY, Sonoma, CA

Built 1974 Load: 84.2 t ADT: 900

ANAPOLIS RD

Fair

Over: SOUTH FORK GUALALA RIVER

1.5 MI E/O SR 1, Sonoma, CA

Built 1974 Load: 99.8 t ADT: 400

U.S. HIGHWAY 101

Fair

Over: WEST SLOUGH

04-SON-101-34.65-HLBG, Sonoma, CA

Built 1960 Load: 99.9 t ADT: 45,500

CALISTOGA ROAD

Fair

Over: PORTER CREEK

7.2 MI INTRX WITH SR 12, Sonoma, CA

Built 1950 Load: 99.9 t ADT: 4,400

GUERNEVILLE ROAD

Good

Over: PINER CREEK

1/2 MI E FULTON ROAD, Sonoma, CA

Built 1921 Load: 14.6 t ADT: 10,000

GUERNEVILLE RD

Good

Over: ABRAMSON CREEK

4.0 MI INTX WITH SR 116, Sonoma, CA

Built 1921 Load: 15.6 t ADT: 12,700

LAWNDALE RD

Good

Over: SONOMA CREEK

WARM SPRINGS ROAD, Sonoma, CA

Built 1900 Load: 15.6 t ADT: 550

PETALUMA HILL RD

Good

Over: LICHAU CREEK

0.1 MI N JCT OLD RDW HWY, Sonoma, CA

Built 1920 Load: 16.2 t ADT: 10,600

MELITA ROAD

Good

Over: SANTA ROSA CREEK

0.1 M S LOS ALAMOS RD, Sonoma, CA

Built 1915 Load: 16.2 t ADT: 500

CANFIELD RD

Good

Over: BLUCHER CREEK

0.9 MI N OF BLANK RD, Sonoma, CA

Built 1927 Load: 16.5 t ADT: 700

GUERNEVILLE RD

Good

Over: PETERSON CREEK

4.77 MI INTX WITH SR 116, Sonoma, CA

Built 1921 Load: 16.8 t ADT: 12,700

GUERNEVILLE RD

Good

Over: FOREST VIEW CREEK

4.82 MI INTX WITH SR 116, Sonoma, CA

Built 1921 Load: 16.8 t ADT: 12,700

BODEGA HIGHWAY

Good

Over: JONIVE CREEK

7.5 MI E/O SR 1, Sonoma, CA

Built 1922 Load: 16.8 t ADT: 6,700

WEST DRY CREEK RD

Good

Over: CRANE CREEK

4.3 MI NW WESTSIDE ROAD, Sonoma, CA

Built 1928 Load: 16.8 t ADT: 200

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