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)

OLD MONTE RIO ROAD

Fair

Over: HILLSIDE

AT SANTA ROSA AVENUE, Sonoma, CA

Built 1960 Load: 30.5 t ADT: 100

FITCH MOUNTAIN RD

Fair

Over: HILLSIDE

1.5 MI E JCT UNV ST HELDG, Sonoma, CA

Built 1955 Load: 30.5 t ADT: 525

MONTE RIO AVE

Fair

Over: HILLSIDE

0.2 MI NE BOHEMIAN AVE, Sonoma, CA

Built 1983 Load: 30.5 t ADT: 100

US HIGHWAY 101 SB

Fair

Over: SOUVERAIN RD

04-SON-101-R40.03, Sonoma, CA

Built 1974 Load: 30.8 t ADT: 13,500

US HIGHWAY 101 NB

Fair

Over: SOUVERAIN RD

04-SON-101-R40.03, Sonoma, CA

Built 1974 Load: 30.8 t ADT: 14,250

MOSCOW RD

Fair

Over: RUSSIAN RIVER

AT JUNCTION WITH SR 116, Sonoma, CA

Built 1966 Load: 30.8 t ADT: 800

MARTINELLI RD

Fair

Over: GREEN VALLEY CREEK

0.35 MI N SH 116, Sonoma, CA

Built 1972 Load: 30.8 t ADT: 250

STARRETT HILL DR

Fair

Over: HILLSIDE

0.7 MI E INT MOSCOW RD, Sonoma, CA

Built 1988 Load: 30.8 t ADT: 200

SUMMERHOME PARK RD

Fair

Over: HILLSIDE

0.4 MI SW RIVER ROAD, Sonoma, CA

Built 1992 Load: 30.8 t ADT: 150

MARK WEST STA RD

Fair

Over: WINDSOR CREEK

1.2 MI E OF TRE-HEALDS RD, Sonoma, CA

Built 1976 Load: 31.1 t ADT: 400

MOSCOW ROAD

Fair

Over: HILLSIDE

1.85 MI NE OF SR 116, Sonoma, CA

Built 1960 Load: 31.4 t ADT: 700

US HIGHWAY 101 SB

Fair

Over: ZANZI LN

04-SON-101-R46.00, Sonoma, CA

Built 1964 Load: 31.8 t ADT: 10,850

US HIGHWAY 101 NB

Fair

Over: ZANZI LN

04-SON-101-R46.00, Sonoma, CA

Built 1964 Load: 31.8 t ADT: 10,800

US HIGHWAY 101 SB

Fair

Over: LYTTON SPRINGS ROAD

04-SON-101-R38.56, Sonoma, CA

Built 1974 Load: 32.1 t ADT: 13,500

US HIGHWAY 101 NB

Fair

Over: LYTTON SPRINGS ROAD

04-SON-101-R38.56, Sonoma, CA

Built 1974 Load: 32.1 t ADT: 14,250

KING RIDGE RD

Fair

Over: BEARPEN CREEK

4.1 MI N FORT ROSS RD, Sonoma, CA

Built 1973 Load: 32.1 t ADT: 200

STWRT PT-SKGG SPRG

Fair

Over: HILLSIDE

26.5 MI E OF SR 1, Sonoma, CA

Built 2003 Load: 32.1 t ADT: 300

NORTH REDWOOD HWY

Fair

Over: NCRRA (OLD NWP RR)

04-SON-101-R54.28, Sonoma, CA

Built 1985 Load: 32.4 t ADT: 1,000

STATE ROUTE 128

Fair

Over: OAT VALLEY CREEK

04-SON-128-L4.64, Sonoma, CA

Built 1932 Load: 32.4 t ADT: 2,550

STATE ROUTE 128

Fair

Over: ROCKAWAY CREEK

04-SON-128-6.44, Sonoma, CA

Built 1976 Load: 32.4 t ADT: 2,650

STATE ROUTE 128

Fair

Over: SAUSAL CREEK

04-SON-128-12.19, Sonoma, CA

Built 1984 Load: 32.4 t ADT: 2,750

STATE ROUTE 116

Fair

Over: HULBERT CREEK

04-SON-116-11.16, Sonoma, CA

Built 1992 Load: 32.4 t ADT: 8,450

U.S. HIGHWAY 101

Fair

Over: HINEBAUGH CREEK

04-SON-101-14.02-RNPK, Sonoma, CA

Built 1968 Load: 32.4 t ADT: 92,000

STATE ROUTE 116

Fair

Over: FIFE CREEK

04-SON-116-11.82, Sonoma, CA

Built 1991 Load: 32.4 t ADT: 8,450

STATE ROUTE 128

Fair

Over: GIRD CREEK

04-SON-128-9.75, Sonoma, CA

Built 1983 Load: 32.4 t ADT: 2,750

US HIGHWAY 101

Fair

Over: N BR LAGUNA DE SANTA RSA

04-SON-101-15.52, Sonoma, CA

Built 1957 Load: 32.4 t ADT: 92,000

US HIGHWAY 101

Fair

Over: WINDSOR CREEK

04-SON-101-29.50, Sonoma, CA

Built 1962 Load: 32.4 t ADT: 45,500

STATE ROUTE 1

Fair

Over: CHENEY GULCH

04-SON-001-9.16, Sonoma, CA

Built 1956 Load: 32.4 t ADT: 6,300

STATE ROUTE 1

Fair

Over: SALMON CREEK

04-SON-001-12.49, Sonoma, CA

Built 1983 Load: 32.4 t ADT: 2,500

SR 1

Fair

Over: RUSSIAN RIVER

04-SON-001-19.72, Sonoma, CA

Built 1984 Load: 32.4 t ADT: 2,500

US HIGHWAY 101

Fair

Over: COLGAN CREEK

04-SON-101-18.88, Sonoma, CA

Built 1957 Load: 32.4 t ADT: 92,000

RAMP/CONNECTOR 101

Fair

Over: COLGAN CREEK

04-SON-101-18.91, Sonoma, CA

Built 1957 Load: 32.4 t ADT: 2,400

STATE ROUTE 1

Fair

Over: SCOTTY CREEK

04-SON-001-15.30, Sonoma, CA

Built 1956 Load: 32.4 t ADT: 5,200

US HIGHWAY 101 NB

Fair

Over: GEYSERVILLE AVENUE

04-SON-101-R40.77, Sonoma, CA

Built 1975 Load: 32.4 t ADT: 14,250

U.S. HIGHWAY 101

Fair

Over: OAT VALLEY CREEK

04-SON-101-R53.06, Sonoma, CA

Built 1984 Load: 32.4 t ADT: 20,000

US HIGHWAY 101 SB

Fair

Over: RUSSIAN RIVER

04-SON-101-33.78-HLBG, Sonoma, CA

Built 1999 Load: 32.4 t ADT: 22,750

US HIGHWAY 101 NB

Fair

Over: RUSSIAN RIVER

04-SON-101-33.78-HLBG, Sonoma, CA

Built 1999 Load: 32.4 t ADT: 22,750

NB101-ROBERTS LAKE

Fair

Over: N BR LAGUNA DE SANTA RSA

04-SON-101-15.52, Sonoma, CA

Built 2002 Load: 32.4 t ADT: 6,500

U.S. HIGHWAY 101

Fair

Over: SANTA ROSA CREEK

04-SON-101-19.99-SRO, Sonoma, CA

Built 2009 Load: 32.4 t ADT: 96,000

S101-E&W12 CONNCTR

Fair

Over: SANTA ROSA CREEK

04-SON-101-19.98-SRO, Sonoma, CA

Built 2009 Load: 32.4 t ADT: 40,000

E&W12-N101 CONNCTR

Fair

Over: SANTA ROSA CREEK

04-SON-101-20.00-SRO, Sonoma, CA

Built 2009 Load: 32.4 t ADT: 40,000

U.S. HIGHWAY 101

Fair

Over: SIXTH STREET

04-SON-101-20.20-SRO, Sonoma, CA

Built 2009 Load: 32.4 t ADT: 96,000

US HIGHWAY 101

Fair

Over: COMMERCE BLVD & NWPRR

04-SON-101-15.03-RNPK, Sonoma, CA

Built 2012 Load: 32.4 t ADT: 92,000

STATE ROUTE 12

Fair

Over: LAGUNA DE SANTA ROSA

04-SON-012-9.63-SEB, Sonoma, CA

Built 2017 Load: 32.4 t ADT: 23,050

U.S. ROUTE 101 SB

Fair

Over: SMART RAILROAD TRACKS

04-SON-101-5.73-PET, Sonoma, CA

Built 2022 Load: 32.4 t ADT: 51,500

U.S. ROUTE 101

Fair

Over: FUTURE RAINIER AVENUE

04-SON-101-5.58-PET, Sonoma, CA

Built 2022 Load: 32.4 t ADT: 103,000

HEALDSBURG AVE

Fair

Over: RUSSIAN RIVER

35.2 MI N MARIN CO LINE, Sonoma, CA

Built 1921 Load: 32.4 t ADT: 8,204

KINLEY DR

Fair

Over: WEST NORTON SLOUGH

35.7 MI N MARIN CO LINE, Sonoma, CA

Built 1960 Load: 32.4 t ADT: 1,000

TOMALES RD

Fair

Over: STEMPLE CREEK

0.9 MI E COUNTY LINE, Sonoma, CA

Built 1970 Load: 32.4 t ADT: 3,000

A STREET

Fair

Over: SANTA ROSA CREEK

BETWN SONOMA AVE FIRST ST, Sonoma, CA

Built 1987 Load: 32.4 t ADT: 5,000

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.