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:

STATE ROUTE 12 WB

Over: NWP RR

04-SON-012-R15.56-SRO, Sonoma, CA

Built 1964 Load: 24.9 t ADT: 36,500

WEST OLIVE ST

Over: SANTA ROSA CREEK

WEST OLIVE ST, Sonoma, CA

Built 1962 Load: 24.9 t ADT: 8,200

PRESSLEY RD

Over: COPELAND CREEK

0.1 MI N LICHAU RD, Sonoma, CA

Built 1968 Load: 24.9 t ADT: 1,000

D STREET

Over: PETALUMA RIVER

NEAR DOWNTOWN PETALUMA, Sonoma, CA

Built 1933 Load: 25.3 t ADT: 16,330

BOHAN DILLON RD

Over: SOUTH FORK GUALALA RIVER

0.8 MI N FORT ROSS RD, Sonoma, CA

Built 1971 Load: 25.3 t ADT: 50

GRANDVIEW RD

Over: JONIVE CREEK

0.05 MI N BODEGA HWY, Sonoma, CA

Built 1956 Load: 25.6 t ADT: 800

STWRT PT-SKGG SPRG

Over: DRY CREEK (BOARD BR)

AT DAM-END DRY CREEK RD, Sonoma, CA

Built 1951 Load: 25.6 t ADT: 2,800

MISSION BLVD

Over: SANTA ROSA CREEK

0.1 MI S SONOMA HWY SR 12, Sonoma, CA

Built 1956 Load: 25.6 t ADT: 20,000

Old Monte Rio Road

Over: HILLSIDE

0.6 MILE S SR 116, Sonoma, CA

Built 1996 Load: 25.6 t ADT: 100

GEYSERS RD

Over: HILLSIDE

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

Built 1999 Load: 25.6 t ADT: 150

RIVERSIDE DRIVE

Over: SONOMA CREEK

0.1 MI W/O HWY 12, Sonoma, CA

Built 2006 Load: 25.6 t ADT: 9,000

STATE ROUTE 1

Over: RUSSIAN GULCH

04-SON-001-24.50, Sonoma, CA

Built 1940 Load: 25.9 t ADT: 2,225

TEMELEC CIRCLE

Over: ROGERS CREEK

0.7 MI W/O ARNOLD DRIVE, Sonoma, CA

Built 1984 Load: 26.6 t ADT: 200

HEALDSBURG AVE

Over: RUSSIAN RIVER OVERFLOW

INT OF BAILACHE AVE, Sonoma, CA

Built 1987 Load: 26.9 t ADT: 8,204

CAZADERO HWY

Over: AUSTIN CREEK

JUST S OF SCANLON RD, Sonoma, CA

Built 1956 Load: 26.9 t ADT: 1,550

RIVER ROAD

Over: HILLSIDE

1.6 MI E INTERCTN SR 116, Sonoma, CA

Built 1979 Load: 26.9 t ADT: 10,300

CHANNEL DRIVE

Over: SANTA ROSA CRK DIV CHAN

0.1 MI S OF MONTGOMERY DR, Sonoma, CA

Built 1959 Load: 26.9 t ADT: 500

STATE ROUTE 116

Over: RUSSIAN RIVER

04-SON-116-10.46, Sonoma, CA

Built 1940 Load: 27.2 t ADT: 8,450

STWRT PT-SKGG SPRG

Over: HOUSE CREEK

13.5 MI E/O SR 1, Sonoma, CA

Built 1921 Load: 27.2 t ADT: 300

RAMAL ROAD

Over: RAMAL CREEK

3.45 MI S OF SH 121, Sonoma, CA

Built 1970 Load: 27.5 t ADT: 400

US HIGHWAY 101

Over: COPELAND CREEK

04-SON-101-13.51-RNPK, Sonoma, CA

Built 1956 Load: 27.9 t ADT: 92,000

WILLOWSIDE RD

Over: SANTA ROSA FL CON CHAN

1 MI S OF GUERNEVILLE RD, Sonoma, CA

Built 1965 Load: 27.9 t ADT: 832

OLD MONTE RIO ROAD

Over: HILLSIDE

0.3 MI SW CHERRY ROAD, Sonoma, CA

Built 1960 Load: 27.9 t ADT: 100

REDWOOD AVE

Over: HILLSIDE

NEAR CAMP MEEKER, Sonoma, CA

Built 1980 Load: 27.9 t ADT: 50

US HIGHWAY 101 SB

Over: ASTI STORE RD

04-SON-101-R47.85, Sonoma, CA

Built 1964 Load: 28.2 t ADT: 10,850

BODEGA HWY

Over: SALMON CREEK

0.9 MI FROM SR 1, Sonoma, CA

Built 1962 Load: 28.2 t ADT: 1,400

MONTGOMERY DR

Over: SANTA ROSA CREEK

PIERCE ST & SOTOYOME DR, Sonoma, CA

Built 1906 Load: 28.2 t ADT: 8,600

LONE PINE RD

Over: BLUCHER CREEK

0.3 MI W OF S.H. 116, Sonoma, CA

Built 1958 Load: 28.2 t ADT: 1,950

OCCIDENTAL RD

Over: ATASCADERO CREEK

1.12 MI W S.R. 116, Sonoma, CA

Built 1971 Load: 28.2 t ADT: 5,100

RIVER ROAD

Over: HILLSIDE

1.7 MI WEST OF MIRABEL RD, Sonoma, CA

Built 2003 Load: 28.2 t ADT: 13,450

US HIGHWAY 101 NB

Over: ASTI STORE RD

04-SON-101-R47.85, Sonoma, CA

Built 1964 Load: 28.5 t ADT: 10,800

RIVER RD

Over: MARK WEST CR, TRENTON RD

4.8 MI WEST OF US 101, Sonoma, CA

Built 1960 Load: 28.5 t ADT: 11,700

MONTE VISTA TERR

Over: HILLSIDE

IN MONTE RIO, Sonoma, CA

Built 2001 Load: 28.5 t ADT: 200

W SODA ROCK LANE

Over: HILLSIDE

1 MI SE ALEXANDER VALY RD, Sonoma, CA

Built 1968 Load: 28.5 t ADT: 100

US HIGHWAY 101 SB

Over: THERESA DRIVE

04-SON-101-R49.05, Sonoma, CA

Built 1964 Load: 28.8 t ADT: 10,850

US HIGHWAY 101 NB

Over: THERESA DRIVE

04-SON-101-R49.05, Sonoma, CA

Built 1964 Load: 28.8 t ADT: 10,800

MADRONE RD

Over: SONOMA CREEK

0.3 MI E OF ARNOLD DR, Sonoma, CA

Built 1956 Load: 29.2 t ADT: 5,000

TODD RD

Over: COLGAN CREEK FLOOD CONT

0.1 MI W/O STONY PT. RD., Sonoma, CA

Built 1970 Load: 29.2 t ADT: 4,100

WESTSIDE ROAD

Over: HILLSIDE

0.3 MI N/O RIVER RD, Sonoma, CA

Built 1987 Load: 29.2 t ADT: 300

MOSCOW RD

Over: HILLSIDE

1/2 MI NW MONTE RIO, Sonoma, CA

Built 1985 Load: 29.5 t ADT: 700

OLD REDWOOD HWY

Over: MARK WEST CREEK

0.4 MI S/O AIRPORT BLVD, Sonoma, CA

Built 1956 Load: 29.8 t ADT: 16,600

MILL CREEK RD

Over: MILL CREEK

5.5 MI W OF WESTSIDE RD, Sonoma, CA

Built 1961 Load: 29.8 t ADT: 210

FITCH MOUNTAIN RD

Over: HILLSIDE

1.3 MI E JCT UNV ST HELDG, Sonoma, CA

Built 1999 Load: 29.8 t ADT: 400

SALMON CREEK RD

Over: COLEMAN VALLEY CREEK

1.3 MI W FITZPATRICK RD, Sonoma, CA

Built 1973 Load: 30.1 t ADT: 80

NIESTRATH RD

Over: SOUTH FORK GUALALA RIVER

JUST N FORT ROSS RD, Sonoma, CA

Built 1971 Load: 30.1 t ADT: 50

SANFORD ROAD

Over: E BR LAGUNA DE SANTA RSA

0.4 MI N OCCIDENTAL RD, Sonoma, CA

Built 1997 Load: 30.1 t ADT: 2,700

CAZADERO HWY

Over: HILLSIDE

3.2 MI N/O SR 116, Sonoma, CA

Built 2005 Load: 30.1 t ADT: 1,450

STATE ROUTE 12

Over: BRUSH CREEK

04-SON-012-18.37-SRO, Sonoma, CA

Built 1962 Load: 30.5 t ADT: 41,250

STATE ROUTE 12 EB

Over: NWP RR

04-SON-012-R15.56-SRO, Sonoma, CA

Built 1964 Load: 30.5 t ADT: 36,500

STARRETT HILL DR

Over: HILLSIDE

0.2 MI E INTX MOSCOW RD, Sonoma, CA

Built 1973 Load: 30.5 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