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)

STATE ROUTE 12 WB

Fair

Over: NWP RR

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

Built 1964 Load: 24.9 t ADT: 36,500

WEST OLIVE ST

Fair

Over: SANTA ROSA CREEK

WEST OLIVE ST, Sonoma, CA

Built 1962 Load: 24.9 t ADT: 8,200

PRESSLEY RD

Fair

Over: COPELAND CREEK

0.1 MI N LICHAU RD, Sonoma, CA

Built 1968 Load: 24.9 t ADT: 1,000

D STREET

Fair

Over: PETALUMA RIVER

NEAR DOWNTOWN PETALUMA, Sonoma, CA

Built 1933 Load: 25.3 t ADT: 16,330

BOHAN DILLON RD

Fair

Over: SOUTH FORK GUALALA RIVER

0.8 MI N FORT ROSS RD, Sonoma, CA

Built 1971 Load: 25.3 t ADT: 50

GRANDVIEW RD

Fair

Over: JONIVE CREEK

0.05 MI N BODEGA HWY, Sonoma, CA

Built 1956 Load: 25.6 t ADT: 800

STWRT PT-SKGG SPRG

Fair

Over: DRY CREEK (BOARD BR)

AT DAM-END DRY CREEK RD, Sonoma, CA

Built 1951 Load: 25.6 t ADT: 2,800

MISSION BLVD

Fair

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

Fair

Over: HILLSIDE

0.6 MILE S SR 116, Sonoma, CA

Built 1996 Load: 25.6 t ADT: 100

GEYSERS RD

Fair

Over: HILLSIDE

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

Built 1999 Load: 25.6 t ADT: 150

RIVERSIDE DRIVE

Fair

Over: SONOMA CREEK

0.1 MI W/O HWY 12, Sonoma, CA

Built 2006 Load: 25.6 t ADT: 9,000

STATE ROUTE 1

Fair

Over: RUSSIAN GULCH

04-SON-001-24.50, Sonoma, CA

Built 1940 Load: 25.9 t ADT: 2,225

TEMELEC CIRCLE

Fair

Over: ROGERS CREEK

0.7 MI W/O ARNOLD DRIVE, Sonoma, CA

Built 1984 Load: 26.6 t ADT: 200

HEALDSBURG AVE

Fair

Over: RUSSIAN RIVER OVERFLOW

INT OF BAILACHE AVE, Sonoma, CA

Built 1987 Load: 26.9 t ADT: 8,204

CAZADERO HWY

Fair

Over: AUSTIN CREEK

JUST S OF SCANLON RD, Sonoma, CA

Built 1956 Load: 26.9 t ADT: 1,550

RIVER ROAD

Fair

Over: HILLSIDE

1.6 MI E INTERCTN SR 116, Sonoma, CA

Built 1979 Load: 26.9 t ADT: 10,300

CHANNEL DRIVE

Fair

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

Fair

Over: RUSSIAN RIVER

04-SON-116-10.46, Sonoma, CA

Built 1940 Load: 27.2 t ADT: 8,450

STWRT PT-SKGG SPRG

Fair

Over: HOUSE CREEK

13.5 MI E/O SR 1, Sonoma, CA

Built 1921 Load: 27.2 t ADT: 300

RAMAL ROAD

Fair

Over: RAMAL CREEK

3.45 MI S OF SH 121, Sonoma, CA

Built 1970 Load: 27.5 t ADT: 400

US HIGHWAY 101

Fair

Over: COPELAND CREEK

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

Built 1956 Load: 27.9 t ADT: 92,000

WILLOWSIDE RD

Fair

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

Fair

Over: HILLSIDE

0.3 MI SW CHERRY ROAD, Sonoma, CA

Built 1960 Load: 27.9 t ADT: 100

REDWOOD AVE

Fair

Over: HILLSIDE

NEAR CAMP MEEKER, Sonoma, CA

Built 1980 Load: 27.9 t ADT: 50

US HIGHWAY 101 SB

Fair

Over: ASTI STORE RD

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

Built 1964 Load: 28.2 t ADT: 10,850

BODEGA HWY

Fair

Over: SALMON CREEK

0.9 MI FROM SR 1, Sonoma, CA

Built 1962 Load: 28.2 t ADT: 1,400

MONTGOMERY DR

Fair

Over: SANTA ROSA CREEK

PIERCE ST & SOTOYOME DR, Sonoma, CA

Built 1906 Load: 28.2 t ADT: 8,600

LONE PINE RD

Fair

Over: BLUCHER CREEK

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

Built 1958 Load: 28.2 t ADT: 1,950

OCCIDENTAL RD

Fair

Over: ATASCADERO CREEK

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

Built 1971 Load: 28.2 t ADT: 5,100

RIVER ROAD

Fair

Over: HILLSIDE

1.7 MI WEST OF MIRABEL RD, Sonoma, CA

Built 2003 Load: 28.2 t ADT: 13,450

US HIGHWAY 101 NB

Fair

Over: ASTI STORE RD

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

Built 1964 Load: 28.5 t ADT: 10,800

RIVER RD

Fair

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

Fair

Over: HILLSIDE

IN MONTE RIO, Sonoma, CA

Built 2001 Load: 28.5 t ADT: 200

W SODA ROCK LANE

Fair

Over: HILLSIDE

1 MI SE ALEXANDER VALY RD, Sonoma, CA

Built 1968 Load: 28.5 t ADT: 100

US HIGHWAY 101 SB

Fair

Over: THERESA DRIVE

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

Built 1964 Load: 28.8 t ADT: 10,850

US HIGHWAY 101 NB

Fair

Over: THERESA DRIVE

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

Built 1964 Load: 28.8 t ADT: 10,800

MADRONE RD

Fair

Over: SONOMA CREEK

0.3 MI E OF ARNOLD DR, Sonoma, CA

Built 1956 Load: 29.2 t ADT: 5,000

TODD RD

Fair

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

Fair

Over: HILLSIDE

0.3 MI N/O RIVER RD, Sonoma, CA

Built 1987 Load: 29.2 t ADT: 300

MOSCOW RD

Fair

Over: HILLSIDE

1/2 MI NW MONTE RIO, Sonoma, CA

Built 1985 Load: 29.5 t ADT: 700

OLD REDWOOD HWY

Fair

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

Fair

Over: MILL CREEK

5.5 MI W OF WESTSIDE RD, Sonoma, CA

Built 1961 Load: 29.8 t ADT: 210

FITCH MOUNTAIN RD

Fair

Over: HILLSIDE

1.3 MI E JCT UNV ST HELDG, Sonoma, CA

Built 1999 Load: 29.8 t ADT: 400

SALMON CREEK RD

Fair

Over: COLEMAN VALLEY CREEK

1.3 MI W FITZPATRICK RD, Sonoma, CA

Built 1973 Load: 30.1 t ADT: 80

NIESTRATH RD

Fair

Over: SOUTH FORK GUALALA RIVER

JUST N FORT ROSS RD, Sonoma, CA

Built 1971 Load: 30.1 t ADT: 50

SANFORD ROAD

Fair

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

Fair

Over: HILLSIDE

3.2 MI N/O SR 116, Sonoma, CA

Built 2005 Load: 30.1 t ADT: 1,450

STATE ROUTE 12

Fair

Over: BRUSH CREEK

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

Built 1962 Load: 30.5 t ADT: 41,250

STATE ROUTE 12 EB

Fair

Over: NWP RR

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

Built 1964 Load: 30.5 t ADT: 36,500

STARRETT HILL DR

Fair

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 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.