Humboldt County, CA

398 public highway bridges

Humboldt County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Humboldt County, California contains 398 public highway bridges. Roughly 32.9% are rated “Good,” 48.7% “Fair,” and 6.3% “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.

398

Total Bridges

32.9%

Good

48.7%

Fair

6.3%

Poor Condition

Condition Distribution

Good

32.9% (131)

Fair

48.7% (194)

Poor

6.3% (25)

All Bridges (398)

Sort:

SR 255

Over: U.S. HIGHWAY 101

01-HUM-255-8.77-ARC, Humboldt, CA

Built 1965 ADT: 34,600

SEVENTH ST

Over: US HIGHWAY 101

01-HUM-101-86.10-ARC, Humboldt, CA

Built 1966 ADT: 34,600

6TH STREET

Over: US HIGHWAY 101

01-HUM-101-98.36, Humboldt, CA

Built 1960 ADT: 8,800

U.S. HIGHWAY 101

Over: ST RTE 254-S101 ON RAMP

01-HUM-101-35.70, Humboldt, CA

Built 1958 ADT: 250

US HIGHWAY 101

Over: SR 254,SOUTH FORK EEL RV

01-HUM-101-R17.89, Humboldt, CA

Built 1964 ADT: 690

U.S. HIGHWAY 101

Over: S101-ST RTE 254

01-HUM-101-39.16, Humboldt, CA

Built 1958 ADT: 250

HUMBOLDT HILL ROAD

Over: US HIGHWAY 101

01-HUM-101-73.72, Humboldt, CA

Built 1963 ADT: 32,400

CRANNELL ROAD

Over: US HIGHWAY 101

01-HUM-101-R97.02, Humboldt, CA

Built 1964 ADT: 10,500

U.S. HIGHWAY 101

Over: SFK EEL RIVER,MATTOLE RD

01-HUM-101-35.75, Humboldt, CA

Built 1958 ADT: 120

US HIGHWAY 101 SB

Over: WEST END RD,CREEK, NCRRA

01-HUM-101-87.84-ARC, Humboldt, CA

Built 1956 ADT: 1,000

US HIGHWAY 101 NB

Over: WEST END RD,CREEK, NCRRA

01-HUM-101-87.84-ARC, Humboldt, CA

Built 1929 ADT: 1,000

US HIGHWAY 101

Over: STATE ROUTE 211

01-HUM-101-64.29, Humboldt, CA

Built 1957 ADT: 5,300

STATE ROUTE 254

Over: U.S. HIGHWAY 101

01-HUM-254-19.94, Humboldt, CA

Built 1961 ADT: 5,400

PESULA ROAD

Over: US HIGHWAY 101

01-HUM-101-31.61, Humboldt, CA

Built 1961 ADT: 5,400

U.S. HIGHWAY 101

Over: US 101 ON&OFF RAMP,NCRRA

01-HUM-101-70.61, Humboldt, CA

Built 1962 ADT: 250

US HIGHWAY 101

Over: SR 254 AVE OF THE GIANTS

01-HUM-101-27.92, Humboldt, CA

Built 1963 ADT: 710

U.S. HIGHWAY 101

Over: KENMAR ROAD

01-HUM-101-59.50-FTA, Humboldt, CA

Built 1962 ADT: 458

TWELFTH ST

Over: U.S. HIGHWAY 101

01-HUM-101-60.49, Humboldt, CA

Built 1962 ADT: 17,900

US HIGHWAY 101

Over: S101-MAIN ON&OFF,NCRRA

01-HUM-101-61.53-FTA, Humboldt, CA

Built 1962 ADT: 17,900

GUINTOLI LANE

Over: US HIGHWAY 101

01-HUM-101-88.80-ARC, Humboldt, CA

Built 1969 ADT: 12,900

STATE ROUTE 299

Over: US HIGHWAY 101

01-HUM-299-0.01-ARC, Humboldt, CA

Built 1956 ADT: 33,000

LOLETA DR

Over: US HIGHWAY 101

01-HUM-101-65.95, Humboldt, CA

Built 1962 ADT: 21,500

HOOKTON ROAD

Over: US HIGHWAY 101

01-HUM-101-68.21, Humboldt, CA

Built 1962 ADT: 21,500

SCHOOL ROAD

Over: US HIGHWAY 101

01-HUM-101-R91.47, Humboldt, CA

Built 1964 ADT: 12,900

US HIGHWAY 101 SB

Over: AIRPORT ROAD

01-HUM-101-R93.85, Humboldt, CA

Built 1964 ADT: 100

US HIGHWAY 101 NB

Over: AIRPORT ROAD

01-HUM-101-R93.85, Humboldt, CA

Built 1964 ADT: 200

MURRAY ROAD

Over: US HIGHWAY 101

01-HUM-101-R92.99, Humboldt, CA

Built 1964 ADT: 12,900

SR 200 (CENTRAL)

Over: US HIGHWAY 101

01-HUM-200-R0.01, Humboldt, CA

Built 1964 ADT: 33,000

HILLER ROAD

Over: US HIGHWAY 101

01-HUM-101-R91.99, Humboldt, CA

Built 1964 ADT: 12,900

SALMON CREEK ROAD

Over: US HIGHWAY 101

01-HUM-101-25.01, Humboldt, CA

Built 1962 ADT: 5,100

SR 200 (N BANK RD)

Over: STATE ROUTE 299

01-HUM-200-R2.66, Humboldt, CA

Built 1965 ADT: 11,200

SPROWL CREEK ROAD

Over: US HIGHWAY 101

01-HUM-101-R11.12, Humboldt, CA

Built 1967 ADT: 5,000

REDWOOD DR

Over: US HIGHWAY 101

01-HUM-101-R11.50, Humboldt, CA

Built 1966 ADT: 5,000

ALDERPOINT ROAD

Over: US HIGHWAY 101

01-HUM-101-R11.77, Humboldt, CA

Built 1966 ADT: 5,000

US HIGHWAY 101

Over: ST RTE 254 (JORDAN RD)

01-HUM-101-R45.90, Humboldt, CA

Built 1966 ADT: 500

GUINTOLI LANE

Over: STATE ROUTE 299

01-HUM-299-0.72-ARC, Humboldt, CA

Built 1969 ADT: 12,400

U.S. HIGHWAY 101

Over: STATE ROUTE 283

01-HUM-101-R51.83, Humboldt, CA

Built 1976 ADT: 3,530

PAINTER ST

Over: US HIGHWAY 101

01-HUM-101-R52.89-RDEL, Humboldt, CA

Built 1976 ADT: 11,000

DAVIS ST

Over: US HIGHWAY 101

01-HUM-101-R52.60-RDEL, Humboldt, CA

Built 1976 ADT: 8,800

11TH ST

Over: US HIGHWAY 101

01-HUM-101-86.33-ARC, Humboldt, CA

Built 1976 ADT: 34,600

G STREET

Over: US HIGHWAY 101

01-HUM-101-86.77-ARC, Humboldt, CA

Built 1976 ADT: 34,600

SUNSET AVE

Over: US HIGHWAY 101

01-HUM-101-86.94-ARC, Humboldt, CA

Built 1976 ADT: 34,600

14TH ST

Over: US HIGHWAY 101

01-HUM-101-86.50-ARC, Humboldt, CA

Built 1976 ADT: 34,600

PEDESTRIAN WALKWAY

Over: US HIGHWAY 101

01-HUM-101-86.70-ARC, Humboldt, CA

Built 1976 ADT: 33,000

SAINT LOUIS RD

Over: US HIGHWAY 101 & NCRRA

01-HUM-101-87.48-ARC, Humboldt, CA

Built 1976 ADT: 34,600

PEDESTRIAN WALKWAY

Over: G ST-N101 ON-RAMP

01-HUM-101-86.70-ARC, Humboldt, CA

Built 1976 ADT: 4,160

HERRICK AVE

Over: US HIGHWAY 101

01-HUM-101-74.77, Humboldt, CA

Built 1984 ADT: 32,400

STATE ROUTE 36

Over: US HIGHWAY 101

01-HUM-036-0.01, Humboldt, CA

Built 2010 ADT: 13,700

CHEZEM RD

Over: REDWOOD CREEK

1.5 MI E HIGHWAY 299, Humboldt, CA

Built 1916 Load: 5.8 t ADT: 78

STATE ROUTE 96

Over: SLATE CREEK

01-HUM-096-29.92, Humboldt, CA

Built 1960 Load: 12.3 t ADT: 540

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

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