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)

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.

Related

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial