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:

MOSCOW ROAD

Over: HILLSIDE

1.85 MI NE OF SR 116, Sonoma, CA

Built 1960 Load: 24.0 t ADT: 700

BOHAN DILLON RD

Over: SOUTH FORK GUALALA RIVER

0.1 MI N FORT ROSS RD, Sonoma, CA

Built 1950 Load: 24.0 t ADT: 50

STATE ROUTE 121

Over: YELLOW CREEK

04-SON-121-6.52, Sonoma, CA

Built 1922 Load: 24.3 t ADT: 16,150

EB STATE ROUTE 12

Over: SANTA ROSA AVE

04-SON-012-R16.26-SRO, Sonoma, CA

Built 1964 Load: 24.3 t ADT: 36,500

REDWOOD

Over: LAGUNA DE SANTA ROSA

JUST W/O US 101, Sonoma, CA

Built 1956 Load: 24.3 t ADT: 2,050

REDWOOD DR

Over: COPELAND CREEK

0.42 MI S ROHNERT PK EXPY, Sonoma, CA

Built 1956 Load: 24.3 t ADT: 3,000

PORTER CREEK ROAD

Over: PORTER CREEK

24.3 MI BEGING RTE 786, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 5,800

CALISTOGA RD

Over: WEEKS CREEK

AT ST. HELENA RD, Sonoma, CA

Built 1953 Load: 24.3 t ADT: 6,000

DRY CRK CANYON RD

Over: DUTCHER CREEK

INTRX DUTCHER CREEK RD, Sonoma, CA

Built 1968 Load: 24.3 t ADT: 2,800

DRY CREEK RD

Over: CANYON CREEK

INTERSECTION CANYON RD, Sonoma, CA

Built 1963 Load: 24.3 t ADT: 2,800

MIDDLE RINCON RD

Over: AUSTIN CREEK

0.25 MI N OF SH 12, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 2,200

CLEVELAND AVE

Over: PAULINE CREEK

0.3 MI N GUERNEVILLE RD, Sonoma, CA

Built 1963 Load: 24.3 t ADT: 13,000

CALISTOGA ROAD

Over: AUSTIN CREEK

N INTRX WITH S.R. 12, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 17,770

PINER ROAD

Over: PINER CREEK

IN SANTA ROSA, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 5,900

COFFEY LANE

Over: PINER CREEK

0.1 MILES S/O PINER ROAD, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 3,100

MARLOW ROAD

Over: PINER CREEK

MARLOW ROAD, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 2,300

MARLOW RD

Over: PAULINE CREEK

MARLOW RD, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 12,500

SNYDER LN

Over: BRANCH OF FIVE CREEK

1.1 MI N ROHNERT PARK EXP, Sonoma, CA

Built 1965 Load: 24.3 t ADT: 1,500

SNYDER LANE

Over: COPELAND CREEK

0.5 MI N E. COTATI AVE, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 3,124

COMMERCE BLVD

Over: HINEBAUGH CREEK

0.1 MI N RNPK EXPRESSWAY, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 500

E COTATI AVE

Over: FLOOD CONTROL DITCH

0.1 MI NE OLD REDWOOD HWY, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 3,000

GEYSERS RD

Over: GIRD CREEK

0.4 MI N OF SR 128, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 500

WATMAUGH ROAD

Over: RODGERS CREEK

0.3 MI W ARNOLD, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 4,000

RAILROAD AVE

Over: DOWDALL CREEK

0.3 MI S/O VERANO, Sonoma, CA

Built 1961 Load: 24.3 t ADT: 524

ST HELENA ROAD

Over: VAN BUREN CREEK

1.2 MI W CALISTOGA RD, Sonoma, CA

Built 1952 Load: 24.3 t ADT: 2,100

GILMORE AVENUE

Over: GOSSAGE CREEK

0.1 MI N/O DERBY LANE, Sonoma, CA

Built 1972 Load: 24.3 t ADT: 100

SCENIC AVE

Over: NO NAME CREEK

0.1 MI W OF S MOORLAND AV, Sonoma, CA

Built 1950 Load: 24.3 t ADT: 615

MECHAM RD

Over: STEMPLE CREEK

S OF 9TH ST, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 3,300

PEPPER RD

Over: STEMPLE CREEK

4 MI W OF US 101, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 3,500

WALKER RD

Over: GOSSAGE CREEK

AT VALLEY FORD ROAD, Sonoma, CA

Built 1967 Load: 24.3 t ADT: 250

RAINSVILLE RD

Over: MARIN CREEK

0.5 MI W STONY POINT RD, Sonoma, CA

Built 1950 Load: 24.3 t ADT: 3,200

CASA GRANDE AVE

Over: ADOBE CREEK

0.4 MI N ELY RD, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 1,600

CASA GRANDE AVE

Over: ADOBE CREEK

0.25 MI S ADOBE RD, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 2,000

E RAILROAD AVE

Over: LICHAU CREEK

0.1 MI E PETALUMA HILL RD, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 750

SWEETWATER SPRG RD

Over: BRANCH REDWOOD CREEK

1.2 MI NE ARMSTRNG WOOD R, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 140

SWEETWTR SPRNGS RD

Over: PORTER CREEK

7.7 MI W ARMSTRONG RD, Sonoma, CA

Built 1968 Load: 24.3 t ADT: 140

ADOBE CANYON ROAD

Over: HILLSIDE

1.1 MI NW/O SR 12, Sonoma, CA

Built 1965 Load: 24.3 t ADT: 650

DUTCHER CREEK RD

Over: DUTCHER CREEK

0.1 MI N DRY CREEK RD, Sonoma, CA

Built 1957 Load: 24.3 t ADT: 900

SKAGGS SPRINGS RD

Over: WARM SPRINGS CREEK

10.9 MI W JCT RCKPLE RD, Sonoma, CA

Built 1978 Load: 24.3 t ADT: 400

LLANO ROAD

Over: ROSELAND CR FLD CNTL CHN

2.4 MI N JCT WITH SR 116, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 3,000

GROVE RD

Over: CARRIGER CREEK

1.7 MI W JCT ARNOLD RD, Sonoma, CA

Built 1960 Load: 24.3 t ADT: 1,850

HYDE ROAD

Over: ARROYO SECO

0.4 MI S JCT NAPA RD, Sonoma, CA

Built 1965 Load: 24.3 t ADT: 400

REDWOOD ROAD

Over: HINEBAUGH CREEK

0.3 MI N ROHNERT PK EXPWY, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 4,000

BETHARDS DRIVE

Over: MATANZAS CREEK

BET TECHEVAH & YULUPA AV, Sonoma, CA

Built 1966 Load: 24.3 t ADT: 6,000

APACHE STREET

Over: PAULIN CREEK

0.1 MI N OF STEELE LANE, Sonoma, CA

Built 1964 Load: 24.3 t ADT: 2,000

CHANATE ROAD

Over: PAULIN CREEK

NEAR MENDOCINO AVENUE, Sonoma, CA

Built 1965 Load: 24.3 t ADT: 17,942

MADISON STREET

Over: WASHINGTON CREEK

NORTH OF HOLLY LANE, Sonoma, CA

Built 1970 Load: 24.3 t ADT: 300

HARNEY DRIVE

Over: SONOMA CREEK

SONOMA STATE INSTITUTION, Sonoma, CA

Built 1935 Load: 24.3 t ADT: 250

GUERNEVILLE RD

Over: LAGUNA DE SANTA ROSA

1.8 MI E/O SR 116, Sonoma, CA

Built 1957 Load: 24.6 t ADT: 8,400

NEELEY ROAD

Over: HILLSIDE

1 MI W SR 116, Sonoma, CA

Built 2006 Load: 24.6 t ADT: 3,000

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