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)

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.

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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.