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)

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 U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial