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:

CROCKER RD

Over: RUSSIAN RIVER

0.6 MI N/E OF S.R. 101, Sonoma, CA

Built 1938 Load: 17.2 t ADT: 3,200

VALLEY FORD RD

Over: GOSSAGE CREEK

6.6 MI INTERSECTION SR 1, Sonoma, CA

Built 1926 Load: 17.2 t ADT: 3,100

CALISTOGA RD

Over: HUMBUG CREEK

4.9 MI N/O SR 12, Sonoma, CA

Built 1935 Load: 17.2 t ADT: 5,800

BODEGA HIGHWAY

Over: ATASCADERO CREEK

9.3 MI E/O SR 1, Sonoma, CA

Built 1923 Load: 17.2 t ADT: 10,304

ANNAPOLIS RD

Over: GUALALA RIV (CLARK XING)

INTRX STWRT PT-SKGSSP RD, Sonoma, CA

Built 1920 Load: 17.2 t ADT: 800

BOHEMIAN HWY

Over: DUTCH BILL CREEK

5.4 MI FROM SR 116, Sonoma, CA

Built 1935 Load: 17.2 t ADT: 2,100

SAN LUIS ROAD

Over: SCHELL CREEK

JUST EAST OF SR 12, Sonoma, CA

Built 1970 Load: 17.2 t ADT: 100

DUNBAR RD

Over: CALABAZAS CREEK

0.1 MI N SYLVIA DRIVE, Sonoma, CA

Built 1915 Load: 17.2 t ADT: 800

KING RIDGE RD

Over: WARD CREEK

0.2 MI N FORT ROSS RD, Sonoma, CA

Built 1973 Load: 17.2 t ADT: 200

CHALK HILL RD

Over: MAACAMA CREEK

1 MI S OF SR 128, Sonoma, CA

Built 1915 Load: 17.5 t ADT: 800

FOURTH ST

Over: FIFE CREEK

NEAR BROOKSIDE LN, Sonoma, CA

Built 1926 Load: 17.8 t ADT: 1,800

STONY POINT RD

Over: SANTA ROSA CREEK

.5 MI S/O W COLLEGE AVE, Sonoma, CA

Built 1971 Load: 18.1 t ADT: 22,000

LAMBERT BRIDGE RD

Over: DRY CREEK

0.4 MI W OF DRY CREEK RD, Sonoma, CA

Built 1915 Load: 18.1 t ADT: 838

LICHAU RD

Over: COPELAND CREEK

1.0 MI E PRESSLEY ROAD, Sonoma, CA

Built 1968 Load: 18.1 t ADT: 1,500

WESTSIDE ROAD

Over: DRY CREEK

0.5 MI WEST OF US 101, Sonoma, CA

Built 1934 Load: 18.8 t ADT: 6,100

W THIRD ST

Over: SANTA ROSA CREEK

BTWN RBTS & WLSN, Sonoma, CA

Built 1935 Load: 18.8 t ADT: 14,600

LESLIE RD

Over: PORTER CREEK

.7M NW MARK WEST SPRGS RD, Sonoma, CA

Built 1972 Load: 18.8 t ADT: 63

FRANZ VALLEY ROAD

Over: FRANZ CREEK

2 MILES SW OF SR 128, Sonoma, CA

Built 1977 Load: 18.8 t ADT: 500

CORBY AVE

Over: COLGAN CREEK

0.1 MILE SOUTH OF HEARN, Sonoma, CA

Built 1930 Load: 19.1 t ADT: 3,000

ADOBE RD

Over: LYNCH CREEK

3.2 MI S PETALUMA HILL RD, Sonoma, CA

Built 1950 Load: 19.1 t ADT: 11,600

FREEZEOUT ROAD

Over: FREEZEOUT CREEK

0.3 MI S MOSCOW RD, Sonoma, CA

Built 1971 Load: 19.4 t ADT: 200

WEST DRY CREEK RD

Over: PENA CREEK

0.7 MI NW YOAKIM BR RD, Sonoma, CA

Built 1924 Load: 19.4 t ADT: 300

GRANT ST

Over: FOSS CREEK

IN HEALDSBURG, Sonoma, CA

Built 1920 Load: 19.8 t ADT: 1,830

WESTSIDE ROAD

Over: MILL CREEK

0.2 MI N FOREMAN LANE, Sonoma, CA

Built 1961 Load: 20.1 t ADT: 3,200

WARM SPRINGS RD

Over: SONOMA CREEK

2.8 MI S OF SR 12, Sonoma, CA

Built 1931 Load: 20.1 t ADT: 800

U.S. HIGHWAY 101

Over: SIERRA AVE

04-SON-101-12.00-COTI, Sonoma, CA

Built 1956 Load: 20.4 t ADT: 86,000

PETALUMA HILL RD

Over: COPELAND CREEK

5.2 MI INTER STONY PNT RD, Sonoma, CA

Built 1969 Load: 20.4 t ADT: 16,000

FREESTONE FLAT RD

Over: SALMON CREEK

0.2 MI E BOHEMIAN HWY, Sonoma, CA

Built 1955 Load: 20.4 t ADT: 121

US HIGHWAY 101 NB

Over: NWP RR/NCRRA

04-SON-101-33.22, Sonoma, CA

Built 1962 Load: 21.1 t ADT: 22,750

BOHEMIAN HWY

Over: RUSSIAN RIVER

AT MONTE RIO, Sonoma, CA

Built 1934 Load: 21.1 t ADT: 3,100

OLD REDWOOD HWY

Over: PRUITT CREEK

1.75 MI S PLEASANT RD, Sonoma, CA

Built 1913 Load: 21.1 t ADT: 9,000

AUSTIN CR RD

Over: AUSTIN CREEK

JUST S CAZADERO HWY, Sonoma, CA

Built 1959 Load: 21.4 t ADT: 200

BODEGA HWY

Over: SALMON CREEK

AT VALLEY FORD-FREESTN RD, Sonoma, CA

Built 1968 Load: 21.4 t ADT: 6,400

BENNETT VALLEY RD

Over: YULUPA CREEK

0.6 MI W WARM SPRINGS RD, Sonoma, CA

Built 1970 Load: 21.7 t ADT: 2,500

AUSTIN CREEK RD

Over: NO NAME CREEK

AT BERKLEY CAMP, Sonoma, CA

Built 1964 Load: 21.7 t ADT: 200

OLD REDWOOD HWY

Over: POOL CREEK

0.5 MI S/O PLEASANT RD, Sonoma, CA

Built 1925 Load: 22.0 t ADT: 13,800

TACHEVAH DR

Over: DRAINAGE CANAL

0.1 M WEST NEUTOMAS AVE, Sonoma, CA

Built 1968 Load: 22.0 t ADT: 3,000

RAINSVILLE RD

Over: WIGGINS CREEK

0.8 MI W STONY POINT RD, Sonoma, CA

Built 1986 Load: 22.0 t ADT: 3,200

CHALK HILL RD

Over: BROOKS CREEK

4.5 MI S OF SR 128, Sonoma, CA

Built 1956 Load: 22.0 t ADT: 850

SWEETWTR SPRNGS RD

Over: PORTER CREEK

6.6 MI W ARMSTRONG RD, Sonoma, CA

Built 1968 Load: 22.0 t ADT: 140

FITCH MOUNTAIN RD

Over: HILLSIDE

1.6 MI E JCT HEALDSBG AVE, Sonoma, CA

Built 1970 Load: 22.0 t ADT: 525

MACARTHUR STREET

Over: NATHANSON CREEK

AUSTIN AVE, Sonoma, CA

Built 1965 Load: 22.4 t ADT: 2,000

US HIGHWAY 101 SB

Over: NWP RR/NCRRA

04-SON-101-33.22, Sonoma, CA

Built 1962 Load: 22.7 t ADT: 22,750

STEELE LANE

Over: PAULINE CREEK

STEELE LANE, Sonoma, CA

Built 1960 Load: 22.7 t ADT: 6,000

FITZPATRICK LANE

Over: FAY CREEK

0.9 MI N SALMON CREEK RD, Sonoma, CA

Built 1973 Load: 23.0 t ADT: 300

OLD MONTE RIO RD

Over: HILLSIDE

0.1 MI NE SANTA ROSA AVE, Sonoma, CA

Built 1980 Load: 23.0 t ADT: 100

US HIGHWAY 101 SB

Over: CITRUS FAIR DRIVE

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

Built 1994 Load: 23.7 t ADT: 6,800

JAMISON RD

Over: MATANZAS CREEK

0.4 MI E SONOMA MTN RD, Sonoma, CA

Built 1969 Load: 23.7 t ADT: 150

WINDSOR RD

Over: BRANCH WINDSOR CREEK

0.3 MI N OF SILK RD, Sonoma, CA

Built 1946 Load: 23.7 t ADT: 1,500

KINLEY DR

Over: WEST SLOUGH

600' SW OF RTE 101, Sonoma, CA

Built 1959 Load: 24.0 t ADT: 200

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