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)

STARRETT HILL DR

Good

Over: HILLSIDE

0.8 MI SE JCT MOSCOW RD, Sonoma, CA

Built 2015 Load: 29.8 t ADT: 200

ROCKPILE ROAD

Good

Over: WARM SPRINGS CREEK

3.5 MI JCT DUTCHER CRK RD, Sonoma, CA

Built 1978 Load: 30.1 t ADT: 1,650

US HIGHWAY 101 SB

Good

Over: LYNCH CREEK

04-SON-101-5.19-PET, Sonoma, CA

Built 1955 Load: 30.8 t ADT: 43,000

N DUTTON AVE

Good

Over: SANTA ROSA CREEK

DUTTON AVE, Sonoma, CA

Built 1973 Load: 31.1 t ADT: 22,000

SWTWATER SPRING RD

Good

Over: PORTER CREEK

4 MI W/O WESTSIDE RD, Sonoma, CA

Built 2005 Load: 31.4 t ADT: 140

MAYS CANYON RD

Good

Over: POCKET CANYON CREEK

JUST W OF S.R. 116, Sonoma, CA

Built 1968 Load: 31.8 t ADT: 95

U.S. HIGHWAY 101

Good

Over: LAGUNA DE SANTA ROSA

04-SON-101-13.09-RNPK, Sonoma, CA

Built 1956 Load: 32.4 t ADT: 92,000

STATE ROUTE 121

Good

Over: TOLAY CREEK

04-SON-121-1.53, Sonoma, CA

Built 1996 Load: 32.4 t ADT: 16,150

US HIGHWAY 101 NB

Good

Over: WILLOW BROOK

04-SON-101-8.05-PET, Sonoma, CA

Built 1956 Load: 32.4 t ADT: 94,000

US HWY 101 ON-RAMP

Good

Over: WASHINGTON CREEK

04-SON-101-4.78-PET, Sonoma, CA

Built 2013 Load: 32.4 t ADT: 20,000

US HIGHWAY 101

Good

Over: CORONA DITCH

04-SON-101-6.85-PET, Sonoma, CA

Built 1954 Load: 32.4 t ADT: 94,000

STATE ROUTE 1

Good

Over: POCOLIMI CREEK

04-SON-001-0.33, Sonoma, CA

Built 1960 Load: 32.4 t ADT: 4,200

STATE ROUTE 116

Good

Over: RUSSIAN RIVER

04-SON-116-R12.19, Sonoma, CA

Built 1998 Load: 32.4 t ADT: 8,450

SR 12

Good

Over: PURPLE DRAW

04-SON-012-9.84, Sonoma, CA

Built 1995 Load: 32.4 t ADT: 23,050

STATE ROUTE 12

Good

Over: TYLER'S DRAINAGE

04-SON-012-23.00, Sonoma, CA

Built 1950 Load: 32.4 t ADT: 21,000

STATE ROUTE 128

Good

Over: REDWOOD CREEK

04-SON-128-21.78, Sonoma, CA

Built 2011 Load: 32.4 t ADT: 2,900

OFFRAMP NB RTE 101

Good

Over: MARK WEST CREEK

04-SON-101-26.12, Sonoma, CA

Built 2014 Load: 32.4 t ADT: 10,000

U.S. ROUTE 101 NB

Good

Over: SMART RAILROAD TRACKS

04-SON-101-5.74-PET, Sonoma, CA

Built 2022 Load: 32.4 t ADT: 51,500

STATE ROUTE 116

Good

Over: LAGUNA DE SANTA ROSA TRB

04-SON-116-31.15, Sonoma, CA

Built 2020 Load: 32.4 t ADT: 18,000

STATE ROUTE 1

Good

Over: SCOTTY CREEK

04-SON-001-15.21, Sonoma, CA

Built 2023 Load: 32.4 t ADT: 5,200

STATE ROUTE 12

Good

Over: SONOMA CREEK

04-SON-012-25.82, Sonoma, CA

Built 2023 Load: 32.4 t ADT: 26,400

STATE ROUTE 12

Good

Over: HOOKER CREEK

04-SON-012-33.31, Sonoma, CA

Built 2023 Load: 32.4 t ADT: 13,900

HAHMAN DR

Good

Over: SPRING CREEK

0.1 M SOUTH SPRING CREEK, Sonoma, CA

Built 1960 Load: 32.4 t ADT: 6,000

STWRT PT-SKGG SPRG

Good

Over: SOUTH FORK GUALALA RIVER

2.5 MI E OF SH 1, Sonoma, CA

Built 1984 Load: 32.4 t ADT: 300

KING RIDGE RD

Good

Over: AUSTIN CREEK

0.5 MI N FORT ROSS RD, Sonoma, CA

Built 1958 Load: 32.4 t ADT: 200

OAKMONT DRIVE

Good

Over: GOLF CREEK

OAKMONT AREA OF SANTA RSA, Sonoma, CA

Built 1981 Load: 32.4 t ADT: 500

OLD REDWOOD HWY

Good

Over: EAST WINDSOR CREEK

0.1 MI S.E. OF SH101, Sonoma, CA

Built 1991 Load: 32.4 t ADT: 20,000

YULUPA AVENUE

Good

Over: SANTA ROSA CREEK

0.1 MI N MONTGOMERY DR., Sonoma, CA

Built 1996 Load: 32.4 t ADT: 1,200

MOUNTAIN HAWK WAY

Good

Over: SKY HAWK CREEK

0.2 MI N/O SR 12, Sonoma, CA

Built 1995 Load: 32.4 t ADT: 3,320

WILD LILAC LANE

Good

Over: RINCON CREEK

NEAR BRUSH CREEK ROAD, Sonoma, CA

Built 2000 Load: 32.4 t ADT: 2,800

GRANGE ROAD

Good

Over: MATANZAS CREEK

.1MI S BENNETT VALLEY RD, Sonoma, CA

Built 2005 Load: 32.4 t ADT: 3,250

WINDSOR ROAD

Good

Over: WINDSOR CREEK

AT VINTAGE GREENS ROAD, Sonoma, CA

Built 2005 Load: 32.4 t ADT: 5,000

CONDE LANE

Good

Over: PRUITT CREEK

0.1 MI N OF SHILOH ROAD, Sonoma, CA

Built 2008 Load: 32.4 t ADT: 3,000

CROSS CREEK ROAD

Good

Over: MARK WEST CREEK,S BRANCH

BY RIEBLI ROAD, Sonoma, CA

Built 1991 Load: 32.4 t ADT: 2,000

MOUNTAIN HAWK WAY

Good

Over: SKY HAWK CREEK

E OF SAN RAMON WAY, Sonoma, CA

Built 1995 Load: 32.4 t ADT: 3,320

STONE BRIDGE ROAD

Good

Over: MEADOW CREEK

0.6 MI W OF OAKMONT DR, Sonoma, CA

Built 1978 Load: 32.4 t ADT: 2,000

WILD OAK DRIVE

Good

Over: OAKMONT CREEK

SW OF OAKMONT DRIVE, Sonoma, CA

Built 1963 Load: 32.4 t ADT: 2,000

BURGESS DRIVE

Good

Over: COLGAN CREEK FLOOD C CHN

NORTH OF BELLEVUE AVENUE, Sonoma, CA

Built 1994 Load: 32.4 t ADT: 500

VALDES COURT

Good

Over: PINER CREEK

NW OF VALDES DRIVE, Sonoma, CA

Built 1976 Load: 32.4 t ADT: 200

MONTECITO BLVD

Good

Over: DUCKER CREEK

S OF BAIRD BLVD, Sonoma, CA

Built 1983 Load: 32.4 t ADT: 1,000

WILLOW CREEK ROAD

Good

Over: WILLOW CREEK

1.45 MI E/O SR 1, Sonoma, CA

Built 2011 Load: 32.4 t ADT: 170

HAUSER BR RD

Good

Over: SOUTH FORK GUALALA RIVER

5 MI. EAST OF SEAVIEW RD., Sonoma, CA

Built 2017 Load: 32.4 t ADT: 100

BOYES BLVD

Good

Over: SONOMA CREEK

JUST EAST OF RIVERSIDE DR, Sonoma, CA

Built 2022 Load: 32.4 t ADT: 4,600

FULTON ROAD

Good

Over: SANTA ROSA CREEK

1/4 MI S COLLEGE AVE, Sonoma, CA

Built 1960 Load: 32.6 t ADT: 19,000

STONY POINT RD

Good

Over: WILLOW BROOK CREEK

0.5 MI N INTX PETLMA BL, Sonoma, CA

Built 1961 Load: 33.0 t ADT: 10,855

STATE ROUTE 12

Good

Over: BRIGHAM AVE

04-SON-012-R17.10-SRO, Sonoma, CA

Built 1969 Load: 34.7 t ADT: 30,000

DUTTON MEADOW

Good

Over: COLGAN CR FLD CNTRL CHNL

NEAR BELLEVUE AVE., Sonoma, CA

Built 1964 Load: 34.7 t ADT: 300

STATE ROUTE 116

Good

Over: AUSTIN CREEK

04-SON-116-4.93, Sonoma, CA

Built 1962 Load: 35.6 t ADT: 5,175

WILLOW CREEK ROAD

Good

Over: WILLOW CREEK

0.5 MI E/O SR 1, Sonoma, CA

Built 1966 Load: 36.6 t ADT: 170

MILLBRAE AVE

Good

Over: N BR LAGUNA DE SANTA RSA

W OF LANGNER, Sonoma, CA

Built 1963 Load: 36.9 t ADT: 3,000

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