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)

STATE ROUTE 29 SB

Unknown

Over: STATE RTE 121/IMOLA AVE

04-NAP-029-R10.38-NAP, Napa, CA

Built 1961 ADT: 27,000

STATE ROUTE 29 NB

Unknown

Over: STATE RTE 121/IMOLA AVE

04-NAP-029-R10.38-NAP, Napa, CA

Built 1961 ADT: 27,000

OLD SONOMA ROAD

Unknown

Over: STATE ROUTE 29

04-NAP-029-10.70-NAP, Napa, CA

Built 1961 ADT: 59,000

FIRST STREET

Unknown

Over: STATE ROUTE 29

04-NAP-029-11.55-NAP, Napa, CA

Built 1964 ADT: 67,000

LINCOLN AVENUE

Unknown

Over: STATE ROUTE 29

04-NAP-029-12.04-NAP, Napa, CA

Built 1967 ADT: 59,000

TRANCAS ST-REDWOOD

Unknown

Over: STATE ROUTE 29

04-NAP-029-13.00-NAP, Napa, CA

Built 2003 ADT: 43,000

NAPA VALLEY RR

Unknown

Over: STATE ROUTE 29

04-NAP-029-12.91-NAP, Napa, CA

Built 2004 ADT: 59,000

PEDESTRIAN WALKWAY

Unknown

Over: STATE ROUTE 29

04-NAP-029-12.90-NAP, Napa, CA

Built 2004 ADT: 59,000

BERRYESSA-KNOXVLLE

Fair

Over: ETICUERA CREEK

7.8 MI N/O POPE CYN ROAD, Napa, CA

Built 1920 Load: 11.0 t ADT: 370

STATE ROUTE 29

Fair

Over: SULPHUR CREEK

04-NAP-029-28.43-SHLA, Napa, CA

Built 1910 Load: 14.9 t ADT: 24,000

MAIN STREET

Fair

Over: NAPA CREEK

SOUTHEAST PEARL ST, Napa, CA

Built 1860 Load: 14.9 t ADT: 5,972

AETNA SPRINGS RD

Fair

Over: SWARTZ CREEK

0.8 MI W POPE VALLEY RD, Napa, CA

Built 1912 Load: 14.9 t ADT: 346

TRANCAS ST

Fair

Over: MILLIKEN CREEK

JUST WEST OF SR 121, Napa, CA

Built 1908 Load: 14.9 t ADT: 3,000

PEARL ST

Fair

Over: NAPA CREEK

BTWN MAIN AND COOMBS STS, Napa, CA

Built 1920 Load: 14.9 t ADT: 3,400

GRANT ST

Fair

Over: GARNETT CREEK

0.2 MI SE GREENWOOD AVE, Napa, CA

Built 1918 Load: 15.2 t ADT: 1,000

OLD SONOMA RD

Fair

Over: CARNEROS CREEK

0.2 MI NE/O SH 121/12, Napa, CA

Built 1896 Load: 15.6 t ADT: 1,959

CONN VALLEY RD

Fair

Over: CONN CREEK

4.1 MI E SILVERADO TRAIL, Napa, CA

Built 1920 Load: 15.6 t ADT: 740

CHILES POPE VLY RD

Fair

Over: CHILES CREEK

2.1 MI N OF S.R. 128, Napa, CA

Built 1907 Load: 15.9 t ADT: 1,600

STATE ROUTE 128

Fair

Over: BLOSSOM CREEK

04-NAP-128-2.80, Napa, CA

Built 1901 Load: 16.2 t ADT: 2,775

STATE ROUTE 128

Fair

Over: SAGE CREEK

04-NAP-128-11.26, Napa, CA

Built 1945 Load: 16.2 t ADT: 2,125

STATE ROUTE 29

Fair

Over: GARNETT CREEK BRANCH

04-NAP-029-38.96, Napa, CA

Built 1920 Load: 16.2 t ADT: 12,000

ZINFANDEL LANE

Fair

Over: NAPA RIVER

1 MI E RT 29 WHEELER STA, Napa, CA

Built 1913 Load: 16.2 t ADT: 2,600

SILVERADO TRAIL

Fair

Over: DUTCH HENRY CREEK

.4 MI N/O LARKMEAD LANE, Napa, CA

Built 1938 Load: 16.2 t ADT: 4,310

OAK KNOLL AVE

Fair

Over: NAPA RIVER OVERFLOW

300' W SILVERADO TRAIL, Napa, CA

Built 1910 Load: 16.2 t ADT: 2,600

POPE ST

Fair

Over: NAPA RIVER

SILVERADO TRAIL, Napa, CA

Built 1894 Load: 16.2 t ADT: 2,790

POPE ST

Fair

Over: SULPHUR CREEK

0.25 MI N/W SR 29, Napa, CA

Built 1908 Load: 16.2 t ADT: 2,790

SPRING MOUNTAIN RD

Fair

Over: YORK CREEK

0.3 MI WEST OF MADRONA ST, Napa, CA

Built 1903 Load: 16.2 t ADT: 1,500

MYRTLEDALE RD

Fair

Over: NAPA RIVER

0.2 MI SE TUBBS LANE, Napa, CA

Built 1930 Load: 16.8 t ADT: 671

HARDIN RD

Fair

Over: MAXWELL CREEK

1.6 MI SE POPE CYN ROAD, Napa, CA

Built 1909 Load: 17.2 t ADT: 140

MT VEEDER RD

Fair

Over: DRY CREEK

0.1 MI S DRY CREEK RD, Napa, CA

Built 1930 Load: 17.2 t ADT: 173

SODA CYN RD

Fair

Over: SODA CREEK

3.1 MI N SILVERADO TRAIL, Napa, CA

Built 1930 Load: 17.2 t ADT: 787

HEDGESIDE AVENUE

Fair

Over: MILLIKEN CREEK

0.4 MI NW RTE 121, Napa, CA

Built 1925 Load: 17.5 t ADT: 1,033

DRY CREEK RD

Fair

Over: DRY CREEK

3.5 MI S OAKVILLE GRADE, Napa, CA

Built 1930 Load: 18.5 t ADT: 2,490

STATE ROUTE 121

Fair

Over: TULUCAY CREEK

04-NAP-121-6.42-NAP, Napa, CA

Built 1918 Load: 18.8 t ADT: 22,850

BALE LANE

Fair

Over: NAPA RIVER

0.1 MI W SILVERADO TRAIL, Napa, CA

Built 1937 Load: 20.7 t ADT: 813

WESTGATE DRIVE

Fair

Over: MILLIKEN CREEK

0.1 MI S/O MILLIKEN CK DR, Napa, CA

Built 1966 Load: 21.4 t ADT: 1,000

SPRING MOUNTAIN RD

Fair

Over: HILLSIDE

3 MI WEST OF MADRONA AVE, Napa, CA

Built 2009 Load: 22.7 t ADT: 450

TRANCAS ST

Fair

Over: NAPA RIVER

1.3 MI E SR 29, Napa, CA

Built 1960 Load: 23.3 t ADT: 14,755

LODI LANE

Fair

Over: NAPA RIVER

0.2 MI W SILVERADO TRAIL, Napa, CA

Built 1930 Load: 23.3 t ADT: 682

POPE VALLEY RD

Fair

Over: DUVALL CREEK

5.50 MI S LAKE CO LINE, Napa, CA

Built 1972 Load: 24.3 t ADT: 1,658

CRYSTAL SPRINGS RD

Fair

Over: BELL CREEK

0.9 MI N SANITARIAN RD, Napa, CA

Built 1970 Load: 24.3 t ADT: 209

RAGATZ LANE

Fair

Over: NAPA RIVER OVERFLOW

0.45 MI NE FRONTAGE RD, Napa, CA

Built 1950 Load: 24.3 t ADT: 161

CHILES POPE VLY RD

Fair

Over: CHILES CREEK

4.0 MI N OF SR 128, Napa, CA

Built 1968 Load: 24.3 t ADT: 750

TROWER AVE

Fair

Over: NAPA DRAIN

JUST E JEFFERSON ST, Napa, CA

Built 1970 Load: 24.3 t ADT: 1,673

STATE ROUTE 29

Fair

Over: CALIFORNIA DRIVE

04-NAP-029-19.04-YNTV, Napa, CA

Built 1959 Load: 24.9 t ADT: 24,900

STATE ROUTE 29

Fair

Over: DRY CREEK

04-NAP-029-16.48, Napa, CA

Built 1970 Load: 25.6 t ADT: 43,000

RAGATZ LANE

Fair

Over: YOUNTVILLE OVERFLOW

0.7 MI NE WASHINGTN ST, Napa, CA

Built 1940 Load: 27.9 t ADT: 161

PRATT AVENUE

Fair

Over: NAPA RIVER

0.1 MI S SILVERADO TRAIL, Napa, CA

Built 1921 Load: 30.1 t ADT: 1,106

SKELLENGER LANE

Fair

Over: CONN CREEK

0.7 MI W SILVERADO TRAIL, Napa, CA

Built 1930 Load: 30.8 t ADT: 306

DUNAWEAL LANE

Fair

Over: NAPA RIVER

0.2 MI N/E SH 29, Napa, CA

Built 1965 Load: 31.1 t ADT: 1,483

Read our methodology — how this data is sourced, computed, and verified.

Related

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