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)

WHISTLER AVE

Good

Over: N BR LAGUNA DE SANTA RSA

0.3 MI N WILFRED AVE, Sonoma, CA

Built 1963 Load: 37.3 t ADT: 200

BROOKWOOD AVE

Good

Over: MATANZAS CR (BROOKWOOD)

BETN CLARK ST-SONOMA AVE, Sonoma, CA

Built 1951 Load: 38.2 t ADT: 9,400

BOHEMIAN HWY

Good

Over: SALMON CREEK

0.2 MI W BODEGA HWY, Sonoma, CA

Built 1971 Load: 38.2 t ADT: 1,850

MILL CREEK RD

Good

Over: MILL CREEK

4.5 MI W OF WESTSIDE RD, Sonoma, CA

Built 1961 Load: 38.2 t ADT: 200

MAGNOLIA DR

Good

Over: WEST SLOUGH

NEAR SKIMMER RD, Sonoma, CA

Built 1979 Load: 39.2 t ADT: 100

WATSON RD

Good

Over: FIFE CREEK

0.15 MI W ARMSTRNG WDS RD, Sonoma, CA

Built 1970 Load: 39.5 t ADT: 100

ROCKPILE ROAD

Good

Over: BOAT LAUNCH UC

0.5 MI W STWT PT-SK SP RD, Sonoma, CA

Built 1985 Load: 39.9 t ADT: 2,400

MISSION BLVD

Good

Over: AUSTIN CREEK

0.5 M NORTH OF HWY 12, Sonoma, CA

Built 1960 Load: 40.2 t ADT: 11,000

LEVERONI RD

Good

Over: SONOMA CREEK

0.65 MI W JCT WITH SR 12, Sonoma, CA

Built 1969 Load: 40.8 t ADT: 10,400

CHALK HILL RD

Good

Over: FRANZ CREEK

3 MI SOUTH SR 128, Sonoma, CA

Built 1965 Load: 42.4 t ADT: 850

HOEN AVENUE

Good

Over: SPRING CREEK

0.3 M SOUTH OF SONOMA AVE, Sonoma, CA

Built 1955 Load: 43.4 t ADT: 2,000

GEYSERS RD

Good

Over: LITTLE SULPHUR CREEK

8.5 MI N OF SH 128, Sonoma, CA

Built 1983 Load: 45.4 t ADT: 500

ALDERBROOK DR

Good

Over: SANTA ROSA CREEK

NEAR 4TH STREET, Sonoma, CA

Built 1979 Load: 45.7 t ADT: 1,000

MAIN STREET

Good

Over: DUTCH BILL CREEK

MAIN STREET AT TYRONE, Sonoma, CA

Built 1975 Load: 47.6 t ADT: 1,600

STATE ROUTE 116

Good

Over: ELLIS CREEK

04-SON-116-37.49, Sonoma, CA

Built 1972 Load: 48.0 t ADT: 12,000

STATE ROUTE 116

Good

Over: RUSSIAN RIVER

04-SON-116-R5.73, Sonoma, CA

Built 1976 Load: 48.6 t ADT: 5,175

WILLOW CREEK RD

Good

Over: WILLOW CREEK

1.5 MI E SH 1, Sonoma, CA

Built 1978 Load: 49.6 t ADT: 170

CORONA RD

Good

Over: PETALUMA RIVER

N OF PETALUMA BLVD, Sonoma, CA

Built 1977 Load: 49.9 t ADT: 4,800

WATERTROUGH RD

Good

Over: ATASCADERO CREEK

0.55 MI N SANDERS RD, Sonoma, CA

Built 1975 Load: 50.2 t ADT: 2,100

E STREET

Good

Over: SANTA ROSA CREEK

BETWN SONOMA AVE & SEC ST, Sonoma, CA

Built 1920 Load: 51.8 t ADT: 11,900

CAZADERO HWY

Good

Over: KIDD CREEK

N OF INTERSECT SR 26, Sonoma, CA

Built 1974 Load: 52.5 t ADT: 1,450

STATE ROUTE 128

Good

Over: FOOTE CREEK

04-SON-128-20.72, Sonoma, CA

Built 1982 Load: 53.8 t ADT: 2,125

RIVER RD

Good

Over: HILLSIDE

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

Built 1971 Load: 55.1 t ADT: 10,300

MARK W SPRING RD

Good

Over: MARK WEST CREEK

15.5 MI N/E INTX RDWD HY, Sonoma, CA

Built 1976 Load: 76.5 t ADT: 2,000

STWRT PT-SKGG SPRG

Good

Over: WOLF CREEK CULVERT WEST

1.7 MI E/O HOUSE CREEK, Sonoma, CA

Built 1978 Load: 99.9 t ADT: 300

STWRT PT-SKGG SPRG

Good

Over: WOLF CREEK CULVERT EAST

2.3 MI E/O HOUSE CREEK, Sonoma, CA

Built 1978 Load: 99.9 t ADT: 300

BLOOMFIELD RD

Poor

Over: BLOOMFIELD CREEK

0.18 MI N VALLEY FORD RD, Sonoma, CA

Built 1917 Load: 13.0 t ADT: 524

OLD DUNCANS GRD RD

Poor

Over: AUSTIN CREEK

BTN CZDERO HY&AUSTN CR RD, Sonoma, CA

Built 1924 Load: 14.3 t ADT: 30

GEYSERS ROAD

Poor

Over: CAMACHO CREEK

24 MI N OF SR 128, Sonoma, CA

Built 1974 Load: 16.2 t ADT: 60

STATE ROUTE 116

Poor

Over: GREEN VALLEY CREEK

04-SON-116-18.66, Sonoma, CA

Built 1930 Load: 16.8 t ADT: 12,400

WOHLER RD

Poor

Over: MARK WEST CREEK

NEAR RIVER RD, Sonoma, CA

Built 1922 Load: 16.8 t ADT: 500

FRANZ VALEY SCH RD

Poor

Over: FRANZ CREEK

JUST N/O FRANZ RD, Sonoma, CA

Built 1946 Load: 18.8 t ADT: 350

LLANO RD

Poor

Over: COLGAN CREEK

1.1 MI N OF SH 116, Sonoma, CA

Built 1979 Load: 19.8 t ADT: 1,750

RIVER RD

Poor

Over: MARK WEST CREEK

11.2 MI W OF SR 116, Sonoma, CA

Built 1958 Load: 21.4 t ADT: 8,000

SARTORI DR

Poor

Over: ADOBE CREEK

0.2 MI SE CASA GRANDE AVE, Sonoma, CA

Built 1976 Load: 21.7 t ADT: 1,475

SNYDER LN

Poor

Over: CRANE CRK (SNYDER)

0.7 MI N ROHNERT PARK EXP, Sonoma, CA

Built 1965 Load: 24.3 t ADT: 1,500

SEAVEY RD

Poor

Over: NO NAME CREEK

0.4 MI W SPRING HILL RD, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 200

SANTA ROSA AVENUE

Poor

Over: COLGAN CREEK

SOUTH OF COLGAN AVENUE, Sonoma, CA

Built 1963 Load: 24.3 t ADT: 29,487

RAILROAD AVENUE

Poor

Over: NO NAME CREEK

AT VAN NESS, Sonoma, CA

Built 1970 Load: 26.9 t ADT: 100

STATE ROUTE 116

Poor

Over: DRAKE ROAD

04-SON-116-R12.42, Sonoma, CA

Built 1999 Load: 27.2 t ADT: 8,450

FIR ROAD

Poor

Over: DUTCH BILL CREEK

MONTE RIO, Sonoma, CA

Built 1974 Load: 27.9 t ADT: 300

RIVER RD

Poor

Over: RUSSIAN RIVER

5.31 MI INTX WITH SR 116, Sonoma, CA

Built 1914 Load: 28.2 t ADT: 10,000

WINDSOR ROAD

Poor

Over: POOL CREEK

0.2 MI N OF SHILOH RD, Sonoma, CA

Built 1967 Load: 28.8 t ADT: 5,900

WASHINGTON ST

Poor

Over: PETALUMA RIVER

NEAR DOWNTOWN PETALUMA, Sonoma, CA

Built 1970 Load: 31.1 t ADT: 21,900

EAGLE NEST LANE

Poor

Over: HILLSIDE

0.2 MI N RIVER RD, Sonoma, CA

Built 1930 Load: 31.8 t ADT: 100

SR 12

Poor

Over: CALABAZAS CREEK

04-SON-012-29.41, Sonoma, CA

Built 1989 Load: 32.4 t ADT: 15,300

STATE ROUTE 128

Poor

Over: RUSSIAN RIVER

04-SON-128-5.44, Sonoma, CA

Built 2006 Load: 32.4 t ADT: 2,650

STATE ROUTE 128

Poor

Over: MAACAMA CREEK

04-SON-128-17.25, Sonoma, CA

Built 2011 Load: 32.4 t ADT: 2,900

OLD REDWOOD HWY

Poor

Over: LAGUNA DE SANTA ROSA

COMMERCE BLVD, Sonoma, CA

Built 1956 Load: 32.4 t ADT: 9,800

TRENTON HEALDSBRG

Poor

Over: MARK WEST CREEK

0.3 MI N OF RIVER RD, Sonoma, CA

Built 1988 Load: 32.4 t ADT: 1,700

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