Napa County, CA

160 public highway bridges

Napa County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Napa County, California contains 160 public highway bridges. Roughly 44.4% are rated “Good,” 46.3% “Fair,” and 4.4% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

160
Total Bridges
44.4%
Good
46.3%
Fair
4.4%
Poor Condition

Condition Distribution

Good
44.4% (71)
Fair
46.3% (74)
Poor
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.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.