Napa County, CA

160 public highway bridges

Napa County Bridge Snapshot

Napa County, California contains 160 public highway bridges in the FHWA National Bridge Inventory. Roughly 44.4% are rated “Good,” 46.3% “Fair,” 4.4% “Poor,” and 4.4% 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.

160
Total Bridges
44.4%
Good
4.4%
Poor
4.4%
Structurally Deficient

Condition Distribution

Good
44.4% (71)
Fair
46.3% (74)
Poor
4.4% (7)
SD
4.4% (7)

All Bridges (160)

CALIFORNIA BLVD

Fair

Over: NAPA CREEK

0.2 MI N FIRST ST, Napa, CA

Built 1990 Load: 32.1 t ADT: 13,986

STATE ROUTE 29 SB

Fair

Over: NAPA VALLEY CORPORATE DR

04-NAP-029-R6.63, Napa, CA

Built 1981 Load: 32.4 t ADT: 22,500

STATE ROUTE 29

Fair

Over: STANLEY CREEK

04-NAP-029-R8.33, Napa, CA

Built 1981 Load: 32.4 t ADT: 48,000

SR 121 WB IMOLA AV

Fair

Over: NAPA RIVER

04-NAP-121-R5.30-NAP, Napa, CA

Built 2007 Load: 32.4 t ADT: 13,500

SR 121 EB IMOLA AV

Fair

Over: NAPA RIVER

04-NAP-121-R5.30-NAP, Napa, CA

Built 2007 Load: 32.4 t ADT: 13,500

COOK ROAD

Fair

Over: NAPA RIVER

1.7 MI N RT 49 YNTVL C R, Napa, CA

Built 1959 Load: 32.4 t ADT: 40

SILVERADO TRAIL

Fair

Over: RECTOR CREEK

1 MI N YOUNTVILE CROSS RD, Napa, CA

Built 1957 Load: 32.4 t ADT: 5,450

SILVERADO TRAIL

Fair

Over: SIMMONS CANYON CREEK

0.35 MI NW DUNAWEAL LANE, Napa, CA

Built 1978 Load: 32.4 t ADT: 1,170

SOSCOL AVE

Fair

Over: NAPA RIVER

0.1 MI S FIRST ST, Napa, CA

Built 1980 Load: 32.4 t ADT: 22,690

REDWOOD ROAD

Fair

Over: REDWOOD CREEK

JUST W MT VEEDER RD, Napa, CA

Built 1989 Load: 32.4 t ADT: 673

LAS AMIGAS RD

Fair

Over: CARNEROS CREEK

0.15 MI SW CUTTING WHARF, Napa, CA

Built 1987 Load: 32.4 t ADT: 2,100

POPE CANYON RD

Fair

Over: YOKEL CREEK

S POPE VALLY CROSS RD, Napa, CA

Built 1989 Load: 32.4 t ADT: 1,370

YOUNTVILLE CROSS R

Fair

Over: NAPA RIVER

0.9 MI SW SILVERADO TRAIL, Napa, CA

Built 1985 Load: 32.4 t ADT: 2,580

POPE CANYON ROAD

Fair

Over: POPE CREEK

0.3 MI N CHILES POPE VALY, Napa, CA

Built 1986 Load: 32.4 t ADT: 485

FOURTH AVE

Fair

Over: MURPHY CREEK

0.3 M S/O COOMBSVILLE RD, Napa, CA

Built 1994 Load: 32.4 t ADT: 1,350

SOSCOL AVE

Fair

Over: NAPA RIVER BYPASS

BTWN FIRST AND PEARL STR, Napa, CA

Built 2004 Load: 32.4 t ADT: 18,241

FIRST STREET

Fair

Over: NAPA CR & RIVER OVERFLOW

JUST EAST OF WEST STREET, Napa, CA

Built 2005 Load: 32.4 t ADT: 5,235

DEVLIN ROAD

Fair

Over: NV RR

0.5 MI W&S OF SR 29, Napa, CA

Built 2012 Load: 32.4 t ADT: 1

POPE CANYON ROAD (

Fair

Over: Pope Creek

5 mi NW of Lake Berryessa, Napa, CA

Built 1969 Load: 32.4 t ADT: 25

ATLAS PEAK ROAD

Fair

Over: MILLIKEN CREEK

0.35 MI NW OF SR 121, Napa, CA

Built 1969 Load: 33.0 t ADT: 3,745

BUTTS CANYON RD

Fair

Over: JAMES CREEK

0.1 MI S JAMES CREEK RD, Napa, CA

Built 1986 Load: 33.4 t ADT: 245

OAKVILLE CROSS RD

Fair

Over: CONN CREEK

0.9 MI W SILVERADO TRAIL, Napa, CA

Built 1967 Load: 36.0 t ADT: 483

BIG RANCH ROAD

Fair

Over: SALVADOR OVERFLOW

0.3 MI N TRANCAS ST, Napa, CA

Built 1988 Load: 36.6 t ADT: 8,768

LOMA VISTA DR

Fair

Over: SODA CREEK

1.4 MI N SILVERADO TRAIL, Napa, CA

Built 1953 Load: 37.3 t ADT: 189

HARDMAN AVENUE

Fair

Over: NAPA RIVER OVERFLOW

JUST E OF SILVERADO TRAIL, Napa, CA

Built 1959 Load: 38.9 t ADT: 1,050

LINCOLN AVENUE

Fair

Over: NAPA RIVER

JUST W SR 121, Napa, CA

Built 1956 Load: 40.2 t ADT: 16,188

STATE ROUTE 29 SB

Fair

Over: SUSCOL CREEK

04-NAP-029-R6.08, Napa, CA

Built 1981 Load: 41.5 t ADT: 32,500

STATE ROUTE 121

Fair

Over: CARNEROS CREEK

04-NAP-121-2.40, Napa, CA

Built 1954 Load: 43.1 t ADT: 27,500

KNOXV-BERRYESSA RD

Fair

Over: PUTAH CRK(LK BERRYESSA)

1 MI N/O POPE CANYON RD, Napa, CA

Built 1957 Load: 47.0 t ADT: 530

STATE ROUTE 29 NB

Fair

Over: NAPA VALLEY CORPORATE DR

04-NAP-029-R6.64, Napa, CA

Built 1981 Load: 48.0 t ADT: 22,500

TRANCAS ST

Fair

Over: MILLIKEN CREEK

JUST WEST OF SR 121, Napa, CA

Built 1973 Load: 49.2 t ADT: 9,000

REDWOOD ROAD

Fair

Over: REDWOOD CREEK

S/E OF MT VEEDER RD, Napa, CA

Built 1977 Load: 67.7 t ADT: 1,221

JEFFERSON STREET

Good

Over: NAPA CREEK

AT CEDAR AVE, Napa, CA

Built 1904 Load: 14.9 t ADT: 15,691

SEMINARY ST

Good

Over: NAPA CREEK

AT ARROYO, Napa, CA

Built 1904 Load: 14.9 t ADT: 1,446

STATE ROUTE 29

Good

Over: YORK CREEK

04-NAP-029-29.29-SHLA, Napa, CA

Built 1902 Load: 15.6 t ADT: 20,000

WOODEN VLY CROS RD

Good

Over: SUISUN CREEK

0.06 MI NE WOODEN VALY RD, Napa, CA

Built 1930 Load: 15.9 t ADT: 100

SILVERADO TRAIL

Good

Over: NO NAME CREEK

2.0 MI N/W OAKNOLL AVE, Napa, CA

Built 1930 Load: 16.2 t ADT: 5,450

DUHIG ROAD

Good

Over: HUICHICHA CREEK

0.4 MI S LAS AMIGAS RD, Napa, CA

Built 1930 Load: 16.8 t ADT: 582

LARKMEAD LANE

Good

Over: DUTCH HENRY CREEK

0.4 MI S/W SILVERDO TRAIL, Napa, CA

Built 1910 Load: 16.8 t ADT: 484

AMERICAN CANYON RD

Good

Over: AMERICAN CANYON CREEK

0.1 MI EAST OF SR 29, Napa, CA

Built 1940 Load: 17.2 t ADT: 16,278

AIRPORT RD

Good

Over: FAGAN CREEK

1.0 MI W OF SR 12/29, Napa, CA

Built 1930 Load: 17.2 t ADT: 3,991

BARNETT RD

Good

Over: BURTON CREEK

0.1 MI N POPE VALLEY ROAD, Napa, CA

Built 1930 Load: 17.2 t ADT: 181

OAKVILLE CROSS RD

Good

Over: CONN CREEK OVERFLOW

1.3 MI NE SR 29, Napa, CA

Built 1925 Load: 17.2 t ADT: 970

SILVERADO TRAIL

Good

Over: NAPA RIVER OVERFLOW

0.1 MILES N OF HARDMAN RD, Napa, CA

Built 1930 Load: 21.1 t ADT: 5,450

WEST PUEBLO AVE

Good

Over: REDWOOD CREEK

AT RANCHO DRIVE, Napa, CA

Built 1970 Load: 21.1 t ADT: 1,915

OAK KNOLL AVE

Good

Over: NAPA RIVER

0.3 MI SW SLVRDO TRAIL, Napa, CA

Built 1922 Load: 21.4 t ADT: 2,600

SILVERADO TRAIL

Good

Over: NAPA RIVER OVERFLOW

0.2 MI NORTH HARDMAN RD, Napa, CA

Built 1930 Load: 22.0 t ADT: 5,450

STAGE COACH CYN RD

Good

Over: BUTTS CREEK

3.4 MI E BUTTS CYN RD, Napa, CA

Built 1970 Load: 22.4 t ADT: 41

LARKMEAD LANE

Good

Over: NAPA RIVER

0.6 MI N OF S.R. 29, Napa, CA

Built 1926 Load: 23.0 t ADT: 484

STAGE COACH CYN RD

Good

Over: BUTTS CREEK

3.7 MI E BUTTS CYN RD, Napa, CA

Built 1970 Load: 23.3 t ADT: 41

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