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:

US HIGHWAY 101 SB

Over: ARATA LANE

04-SON-101-30.67, Sonoma, CA

Built 1962 ADT: 780

US HIGHWAY 101 NB

Over: ARATA LANE

04-SON-101-30.67, Sonoma, CA

Built 1962 ADT: 1,000

LIMERICK LANE

Over: US HIGHWAY 101

04-SON-101-32.79, Sonoma, CA

Built 1962 ADT: 45,500

US HIGHWAY 101 SB

Over: HEALDSBURG AVENUE

04-SON-101-33.48, Sonoma, CA

Built 1962 ADT: 1,050

US HIGHWAY 101 NB

Over: HEALDSBURG AVENUE

04-SON-101-33.48, Sonoma, CA

Built 1962 ADT: 1,000

US HIGHWAY 101 SB

Over: HEALDSBURG AV-S101 ON-RP

04-SON-101-34.55-HLBG, Sonoma, CA

Built 1960 ADT: 13,900

US HIGHWAY 101 NB

Over: HEALDSBURG AV-S101 ON-RP

04-SON-101-34.55-HLBG, Sonoma, CA

Built 1960 ADT: 16,000

US HIGHWAY 101

Over: 3RD ST, 4TH ST, & 5TH ST

04-SON-101-20.09-SRO, Sonoma, CA

Built 1968 ADT: 300

US HIGHWAY 101

Over: NINTH STREET

04-SON-101-20.48-SRO, Sonoma, CA

Built 1968 ADT: 51,500

US HIGHWAY 101

Over: DRY CREEK ROAD

04-SON-101-36.27, Sonoma, CA

Built 1960 ADT: 650

US HIGHWAY 101 SB

Over: CHIQUITA ROAD

04-SON-101-36.95, Sonoma, CA

Built 1960 ADT: 800

US HIGHWAY 101 NB

Over: CHIQUITA ROAD

04-SON-101-36.95, Sonoma, CA

Built 1960 ADT: 1,000

U.S. HIGHWAY 101

Over: WESTSIDE RD

04-SON-101-34.88, Sonoma, CA

Built 1960 ADT: 1,000

CORONA RD

Over: U.S. HIGHWAY 101

04-SON-101-6.83-PET, Sonoma, CA

Built 1955 ADT: 94,000

SANTA ROSA AV-S101

Over: U.S. HIGHWAY 101

04-SON-101-15.53, Sonoma, CA

Built 1957 ADT: 104,000

TODD ROAD

Over: U.S. HIGHWAY 101 & RAMPS

04-SON-101-16.54, Sonoma, CA

Built 1957 ADT: 92,000

BAKER AVENUE

Over: U.S. HIGHWAY 101

04-SON-101-19.00, Sonoma, CA

Built 1957 ADT: 99,000

HEARN AVENUE

Over: U.S. HIGHWAY 101 & RAMPS

04-SON-101-18.49, Sonoma, CA

Built 1957 ADT: 92,000

INDUSTRIAL DR

Over: U.S. HIGHWAY 101

04-SON-101-22.81-SRO, Sonoma, CA

Built 1962 ADT: 96,000

US HIGHWAY 101 SB

Over: WINDSOR LANE

04-SON-101-29.35, Sonoma, CA

Built 1962 ADT: 1,000

US HIGHWAY 101 NB

Over: WINDSOR LANE

04-SON-101-29.35, Sonoma, CA

Built 1962 ADT: 800

RIVER ROAD

Over: U.S. HIGHWAY 101

04-SON-101-24.86, Sonoma, CA

Built 1962 ADT: 68,000

FULTON ROAD

Over: U.S. HIGHWAY 101

04-SON-101-25.90, Sonoma, CA

Built 1962 ADT: 62,000

SHILOH ROAD

Over: U.S. HIGHWAY 101

04-SON-101-27.62, Sonoma, CA

Built 1962 ADT: 62,000

S101-W12 CONNECTOR

Over: OLIVE STREET

04-SON-101-19.82-SRO, Sonoma, CA

Built 1964 ADT: 2,030

SR 12 WB

Over: S101-E12 CONNECTOR RAMP

04-SON-012-R15.90-SRO, Sonoma, CA

Built 1964 ADT: 60,000

SR 12 EB

Over: S101-E12 CONNECTOR RAMP

04-SON-012-R15.90-SRO, Sonoma, CA

Built 1964 ADT: 50,250

E12-N101 CONNECTOR

Over: SR 12 & US 101

04-SON-012-R15.99-SRO, Sonoma, CA

Built 1964 ADT: 10,900

SR 12 WB

Over: US 101 & CONNECTOR RAMPS

04-SON-012-R16.01-SRO, Sonoma, CA

Built 1964 ADT: 7,150

SR 12 EB

Over: US 101 & CONNECTOR RAMPS

04-SON-012-R16.01-SRO, Sonoma, CA

Built 1964 ADT: 7,150

PEDESTRIAN WALKWAY

Over: U.S. HIGHWAY 101 & RAMPS

04-SON-101-19.54-SRO, Sonoma, CA

Built 1963 ADT: 93,100

ROHNERT PARK EXPWY

Over: U.S. HIGHWAY 101 & RAMPS

04-SON-101-13.88-RNPK, Sonoma, CA

Built 1973 ADT: 92,000

US HIGHWAY 101 SB

Over: GEYSERVILLE AVE

04-SON-101-R41.43, Sonoma, CA

Built 1975 ADT: 1,100

US HIGHWAY 101 NB

Over: GEYSERVILLE AVE

04-SON-101-R41.43, Sonoma, CA

Built 1975 ADT: 1,100

US HIGHWAY 101 SB

Over: ST RTE 128 (CANYON RD)

04-SON-101-R43.36, Sonoma, CA

Built 1975 ADT: 2,650

US HIGHWAY 101 NB

Over: ST RTE 128 (CANYON RD)

04-SON-101-R43.36, Sonoma, CA

Built 1975 ADT: 2,650

CAULFIELD LANE

Over: U.S. HIGHWAY 101

04-SON-101-3.98-PET, Sonoma, CA

Built 1974 ADT: 86,000

E WASHINGTON ST

Over: US HIGHWAY 101

04-SON-101-4.76-PET, Sonoma, CA

Built 1975 ADT: 86,000

PEDESTRIAN WALKWAY

Over: US HIGHWAY 101

04-SON-101-4.55-PET, Sonoma, CA

Built 1971 ADT: 86,000

S CLOVERDALE BLVD

Over: US HIGHWAY 101

04-SON-101-R50.43, Sonoma, CA

Built 1991 ADT: 17,200

US HIGHWAY 101 SB

Over: FIRST ST & CLOVERDALE CR

04-SON-101-R52.06-CLVD, Sonoma, CA

Built 1994 ADT: 680

US HIGHWAY 101 NB

Over: FIRST ST & CLOVERDALE CR

04-SON-101-R52.06-CLVD, Sonoma, CA

Built 1994 ADT: 1,020

BICENTENNIAL WAY

Over: U.S. HIGHWAY 101

04-SON-101-22.52-SRO, Sonoma, CA

Built 1979 ADT: 96,000

U.S. HIGHWAY 101

Over: SR 128 (MCCRAY ROAD)

04-SON-101-R54.21, Sonoma, CA

Built 1989 ADT: 2,650

SR 12 WB

Over: SOUTH E STREET

04-SON-012-R16.65-SRO, Sonoma, CA

Built 1990 ADT: 8,900

SR 12 EB

Over: SOUTH E STREET

04-SON-012-R16.65-SRO, Sonoma, CA

Built 1990 ADT: 8,900

SR 12 WB

Over: BROOKWOOD AVE

04-SON-012-R16.80-SRO, Sonoma, CA

Built 1990 ADT: 6,375

STATE ROUTE 12 EB

Over: BROOKWOOD AVE

04-SON-012-R16.80-SRO, Sonoma, CA

Built 1990 ADT: 6,375

STONY POINT RD

Over: STATE ROUTE 12

04-SON-012-R14.45-SRO, Sonoma, CA

Built 1993 ADT: 61,000

HOEN AV-W12 ON RMP

Over: ST RTE 12 - FARMERS LANE

04-SON-012-T17.60, Sonoma, CA

Built 2003 ADT: 40,750

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 5, 2026