Humboldt County, CA

398 public highway bridges

Humboldt County Bridge Snapshot

Humboldt County, California contains 398 public highway bridges in the FHWA National Bridge Inventory. Roughly 32.9% are rated “Good,” 48.7% “Fair,” 6.3% “Poor,” and 6.3% 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.

398

Total Bridges

32.9%

Good

6.3%

Poor

6.3%

Structurally Deficient

Condition Distribution

Good

32.9% (131)

Fair

48.7% (194)

Poor

6.3% (25)

SD

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.

Related

Browse all → | Rankings →

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026