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)

SHURTLEFF AVE

Good

Over: TULOCAY CR (CAYETANO CR)

AT WYATT RD, Napa, CA

Built 1925 Load: 24.0 t ADT: 2,836

STATE ROUTE 29

Good

Over: AMERICAN CANYON CREEK

04-NAP-029-0.56, Napa, CA

Built 1943 Load: 24.3 t ADT: 48,000

SILVERADO TRAIL

Good

Over: SODA SPRINGS CREEK

0.06 MI N SODA CANYON, Napa, CA

Built 1972 Load: 24.3 t ADT: 3,211

BUTTS CANYON RD

Good

Over: FP CREEK

3.5 MI S LAKE COUNTY LINE, Napa, CA

Built 1968 Load: 24.3 t ADT: 240

MULBERRY ST

Good

Over: HOPPER CREEK

0.2 MI E YOUNT ST, Napa, CA

Built 1970 Load: 24.3 t ADT: 785

CAPELL CROSS RD

Good

Over: CAPELL CREEK

0.1 MI W/O SR 128, Napa, CA

Built 1955 Load: 24.3 t ADT: 100

WINE COUNTRY AVE

Good

Over: NAPA DRAIN

AT SOLANO AVE, Napa, CA

Built 1960 Load: 24.3 t ADT: 3,853

PARTRICK ROAD

Good

Over: BROWNS VALLEY CREEK

NAPA, Napa, CA

Built 2014 Load: 25.3 t ADT: 300

SOLANO AVE

Good

Over: DRY CREEK

JUST SOUTH OF DARMS LANE, Napa, CA

Built 1970 Load: 27.2 t ADT: 1,560

STATE ROUTE 221

Good

Over: BASALT ROAD

04-NAP-221-1.50-NAP, Napa, CA

Built 1944 Load: 27.9 t ADT: 24,500

STATE ROUTE 29 NB

Good

Over: NAPA CREEK

04-NAP-029-11.65-NAP, Napa, CA

Built 1949 Load: 28.2 t ADT: 33,500

WASHINGTON ST

Good

Over: DRY CREEK

JUST SOUTH OF DARMS LANE, Napa, CA

Built 1970 Load: 28.5 t ADT: 343

STATE ROUTE 29 SB

Good

Over: NAPA CREEK

04-NAP-029-11.65-NAP, Napa, CA

Built 1964 Load: 29.5 t ADT: 33,500

OAK KNOLL AVE

Good

Over: NAPA RIVER OVERFLOW

0.35 MI SW SLVRDO TRAIL, Napa, CA

Built 1930 Load: 31.8 t ADT: 2,600

STATE ROUTE 128

Good

Over: NAPA RIVER

04-NAP-128-5.25, Napa, CA

Built 1981 Load: 32.4 t ADT: 2,075

STATE ROUTE 128

Good

Over: CYRUS CREEK

04-NAP-128-3.74, Napa, CA

Built 1993 Load: 32.4 t ADT: 9,800

STATE ROUTE 29 SB

Good

Over: CFNR & PAOLI LOOP ROAD

04-NAP-029-R2.37, Napa, CA

Built 1979 Load: 32.4 t ADT: 22,625

STATE ROUTE 29 NB

Good

Over: CFNR & PAOLI LOOP ROAD

04-NAP-029-R2.37, Napa, CA

Built 1979 Load: 32.4 t ADT: 22,625

ST RTE 29, BYWAY E

Good

Over: CRAIG CREEK

04-NAP-029-14.11-NAP, Napa, CA

Built 1958 Load: 32.4 t ADT: 43,000

STATE ROUTE 29

Good

Over: PERFUME CREEK

04-NAP-029-17.81-YNTV, Napa, CA

Built 1963 Load: 32.4 t ADT: 43,000

STATE ROUTE 121

Good

Over: TULUCAY CREEK

04-NAP-121-R5.71, Napa, CA

Built 1949 Load: 32.4 t ADT: 27,000

SR 29

Good

Over: TO KALON CREEK

04-NAP-029-22.36, Napa, CA

Built 1995 Load: 32.4 t ADT: 28,000

SR 29

Good

Over: BALE SLOUGH

04-NAP-029-25.40, Napa, CA

Built 1995 Load: 32.4 t ADT: 26,000

STATE ROUTE 121

Good

Over: CAPELL CREEK

04-NAP-121-20.29, Napa, CA

Built 2014 Load: 32.4 t ADT: 2,450

STATE ROUTE 29

Good

Over: TROUTDALE CREEK

04-NAP-029-47.20, Napa, CA

Built 2016 Load: 32.4 t ADT: 9,000

STATE ROUTE 29

Good

Over: NAPA RIVER

04-NAP-029-37.03-CSTG, Napa, CA

Built 2019 Load: 32.4 t ADT: 14,000

STATE ROUTE 128

Good

Over: CONN CREEK

04-NAP-128-R7.41, Napa, CA

Built 2020 Load: 32.4 t ADT: 3,300

STATE ROUTE 128

Good

Over: CAPELL CREEK

04-NAP-128-20.23, Napa, CA

Built 2021 Load: 32.4 t ADT: 3,500

STATE ROUTE 121

Good

Over: HUICHICA CREEK

04-NAP-121-0.75, Napa, CA

Built 2022 Load: 32.4 t ADT: 27,300

SILVERADO TRAIL

Good

Over: BELL CANYON CREEK

AT GLASS MTN RD, Napa, CA

Built 1936 Load: 32.4 t ADT: 4,310

THIRD STREET

Good

Over: NAPA RIVER

JUST W SOSCOL AVE, Napa, CA

Built 2002 Load: 32.4 t ADT: 12,050

WOODEN VALLEY RD

Good

Over: WOODEN VALLEY CREEK

3.4 MI S SR 121, Napa, CA

Built 1966 Load: 32.4 t ADT: 500

REDWOOD ROAD

Good

Over: REDWOOD CREEK

AT DRY CREEK ROAD, Napa, CA

Built 1982 Load: 32.4 t ADT: 3,631

BROADWAY

Good

Over: AMERICAN CANYON CREEK

S/O AMERICAN CYN RD, Napa, CA

Built 1973 Load: 32.4 t ADT: 1,500

EVEY RD

Good

Over: NAPA RIVER

0.4 MI N BENNETT LANE, Napa, CA

Built 1980 Load: 32.4 t ADT: 64

VALLEYVIEW ST

Good

Over: SULPHUR CREEK

0.1 MI N GRAYSON AVE, Napa, CA

Built 1981 Load: 32.4 t ADT: 1,000

PETRIFIED FORST RD

Good

Over: CYRUS CREEK

0.5 MI W OF SR 128, Napa, CA

Built 1989 Load: 32.4 t ADT: 9,783

JEFFERSON ST

Good

Over: NAPA DRAIN

JUST NORTH OF TROWER AVE, Napa, CA

Built 1991 Load: 32.4 t ADT: 5,439

FIRST STREET

Good

Over: NAPA RIVER

0.1 MI W OF SR 121, Napa, CA

Built 2009 Load: 32.4 t ADT: 23,200

OAKVILLE CROSSROAD

Good

Over: NAPA RIVER

0.5 MI NE OF SR 29, Napa, CA

Built 2016 Load: 32.4 t ADT: 3,000

GREENWOOD AVE

Good

Over: NAPA RIVER

.2 MI SW/O MYRTLEDALE RD, Napa, CA

Built 2015 Load: 32.4 t ADT: 386

DEVLIN ROAD

Good

Over: FAGAN CREEK

0.1 MI N OF TOWER RD, Napa, CA

Built 2019 Load: 32.4 t ADT: 3,500

BERRY STREET

Good

Over: NAPA RIVER

SE OF WASHINGTON STREET, Napa, CA

Built 2018 Load: 32.4 t ADT: 1,500

MOUNT VEEDER ROAD

Good

Over: PICKLE CREEK

2.1 MILES N OF REDWOOD RD, Napa, CA

Built 2020 Load: 32.4 t ADT: 737

BERRYESSA-KNOXVLLE

Good

Over: ETICUERA CREEK

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

Built 2020 Load: 32.4 t ADT: 370

GASSER DRIVE

Good

Over: TULOCAY CREEK

NORTH OF KANSAS AVE, Napa, CA

Built 2019 Load: 32.4 t ADT: 1,800

VILLA LANE

Good

Over: SILVERADO CREEK

0.35 MI N/O TRANCAS STR, Napa, CA

Built 1999 Load: 38.6 t ADT: 576

DEVLIN ROAD

Good

Over: SOSCOL CREEK

0.2 MI E SOSCOL FERRY RD, Napa, CA

Built 1981 Load: 44.4 t ADT: 499

MEADOWBROOK DRIVE

Good

Over: BROWNS VALLEY CREEK

JUST S OF TALL GRASS DR, Napa, CA

Built 2007 Load: 44.4 t ADT: 1

SR 121

Good

Over: SARCO CREEK

04-NAP-121-9.30, Napa, CA

Built 2018 Load: 47.3 t ADT: 12,000

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.