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)

STATE ROUTE 255

Fair

Over: MIDDLE CHANNEL

01-HUM-255-0.67-EUR, Humboldt, CA

Built 1971 Load: 22.7 t ADT: 7,300

PINE CREEK RD

Fair

Over: SOCTISH CREEK

2.9 MI N OF BAIR RD, Humboldt, CA

Built 1950 Load: 22.7 t ADT: 437

ALDERPOINT RD

Fair

Over: EEL RIVER & NWP RR

0.5 MI SE OF ALDERPOINT, Humboldt, CA

Built 1972 Load: 23.0 t ADT: 240

STATE ROUTE 299

Fair

Over: RAMP ROAD

01-HUM-299-R4.04, Humboldt, CA

Built 1965 Load: 23.7 t ADT: 9,700

EAST FRONTAGE ROAD

Fair

Over: PEDESTRIAN WALKWAY

0.2 MI N 14TH ST, Humboldt, CA

Built 1976 Load: 23.7 t ADT: 2,000

STATE ROUTE 299

Fair

Over: ESSEX LANE

01-HUM-299-R2.92, Humboldt, CA

Built 1965 Load: 24.0 t ADT: 11,200

PRICE CREEK ROAD

Fair

Over: PRICE CREEK

2.0 MI W BLUE SLIDE ROAD, Humboldt, CA

Built 1953 Load: 24.0 t ADT: 39

BALD HILLS ROAD

Fair

Over: KLAMATH RIVER

AT INTERSECTION SR 169, Humboldt, CA

Built 1959 Load: 24.3 t ADT: 43

MCCANN ROAD

Fair

Over: EEL RIVER

E DYERVILLE LOOP RD, Humboldt, CA

Built 1965 Load: 24.3 t ADT: 100

STATE PARK ROAD

Fair

Over: UPPER DURPHY CREEK

RICHARDSON GROVE ST. PK., Humboldt, CA

Built 1965 Load: 24.3 t ADT: 300

IRR BIA RTE 3

Fair

Over: TULLY CREEK

3KM NW MARTIN FERRY BRIDG, Humboldt, CA

Built 1972 Load: 24.5 t ADT: 10

IRR BIA RTE 11

Fair

Over: PINE CREEK

16 KM NW OF HOOPA, Humboldt, CA

Built 1977 Load: 24.5 t ADT: 10

IRR BIA RTE 18

Fair

Over: PINE CREEK

1.5KM S MARTIN FERRY BD., Humboldt, CA

Built 1977 Load: 24.5 t ADT: 40

US HIGHWAY 101 SB

Fair

Over: KING SALMON AVE

01-HUM-101-72.88, Humboldt, CA

Built 1963 Load: 24.9 t ADT: 16,200

US HIGHWAY 101 NB

Fair

Over: KING SALMON AVE

01-HUM-101-72.88, Humboldt, CA

Built 1963 Load: 24.9 t ADT: 16,200

STATE ROUTE 211

Fair

Over: OLD RIVER

01-HUM-211-R76.46, Humboldt, CA

Built 1964 Load: 24.9 t ADT: 5,300

FORT SEWARD RD

Fair

Over: EEL RIVER

6 MI E DYERVILLE LOOP RD, Humboldt, CA

Built 1958 Load: 25.3 t ADT: 350

STATE ROUTE 299

Fair

Over: LINDSAY CR,FIELDBROOK RD

01-HUM-299-R3.50, Humboldt, CA

Built 1965 Load: 25.6 t ADT: 11,200

STATE ROUTE 169

Fair

Over: RUBE CREEK

01-HUM-169-27.57, Humboldt, CA

Built 1970 Load: 25.6 t ADT: 320

US HIGHWAY 101 SB

Fair

Over: PALMER BLVD

01-HUM-101-62.23, Humboldt, CA

Built 1958 Load: 25.9 t ADT: 22,000

US HIGHWAY 101 SB

Fair

Over: JORDAN CREEK

01-HUM-101-R46.19, Humboldt, CA

Built 1971 Load: 26.2 t ADT: 3,600

KNEELAND ROAD

Fair

Over: LAWRENCE CREEK

26.1 MI NE/O BRIDGEVILLE, Humboldt, CA

Built 1949 Load: 26.2 t ADT: 28

US HIGHWAY 101 NB

Fair

Over: PALMER BLVD

01-HUM-101-62.23, Humboldt, CA

Built 1958 Load: 26.6 t ADT: 22,000

RIVERWALK DRIVE

Fair

Over: STRONGS CREEK

0.9 MI NORTH OF HWY 101, Humboldt, CA

Built 1962 Load: 26.9 t ADT: 2,322

FAIRWAY DR

Fair

Over: MARTIN SLOUGH

1 MI EAST OF SR 101, Humboldt, CA

Built 1964 Load: 26.9 t ADT: 9,240

STATE ROUTE 36

Fair

Over: BUTTE CREEK

01-HUM-036-34.52, Humboldt, CA

Built 1960 Load: 27.5 t ADT: 1,200

ACCESS ROAD TO CDF

Fair

Over: BROWNS CREEK

NE OFKNEELAND,BRIDGEVILLE, Humboldt, CA

Built 2012 Load: 27.5 t ADT: 12

U.S. HIGHWAY 101

Fair

Over: EEL RIVER & NCRRA

01-HUM-101-R48.69, Humboldt, CA

Built 1965 Load: 27.9 t ADT: 5,900

US HIGHWAY 101 NB

Fair

Over: ELK RIVER

01-HUM-101-74.60, Humboldt, CA

Built 1988 Load: 27.9 t ADT: 16,200

BLUE SLIDE RD

Fair

Over: HOWE CREEK

JCT HOWE CREEK ROAD, Humboldt, CA

Built 1978 Load: 27.9 t ADT: 346

STATE ROUTE 254

Fair

Over: GREENLAW CREEK

01-HUM-254-46.12, Humboldt, CA

Built 1959 Load: 28.2 t ADT: 330

STATE ROUTE 299

Fair

Over: GLENDALE DR

01-HUM-299-R3.78, Humboldt, CA

Built 1965 Load: 28.2 t ADT: 11,200

ALDERPOINT ROAD

Fair

Over: NORTH DOBBYN CREEK

5 MI N/O ALDERPOINT, Humboldt, CA

Built 1966 Load: 28.2 t ADT: 201

ALDERPOINT RD

Fair

Over: LARABEE CREEK

15.5 MI N ALDER POINT, Humboldt, CA

Built 1966 Load: 28.5 t ADT: 124

RIVER BAR ROAD

Fair

Over: BARBER CREEK WASH

0.6 MI SOUTH OF RTE 36, Humboldt, CA

Built 1970 Load: 28.5 t ADT: 351

STATE ROUTE 36

Fair

Over: SOUTH FORK VAN DUZEN RIV

01-HUM-036-35.37, Humboldt, CA

Built 1962 Load: 28.8 t ADT: 1,200

U.S. HIGHWAY 101

Fair

Over: WESTHAVEN DRIVE

01-HUM-101-98.07, Humboldt, CA

Built 1960 Load: 29.2 t ADT: 8,800

US HIGHWAY 101 NB

Fair

Over: N CENTRAL AVE

01-HUM-101-R95.62, Humboldt, CA

Built 1964 Load: 29.2 t ADT: 16,500

FRESHWATER POOL RD

Fair

Over: FRESHWATER CREEK

0.03 MI S FRESHWATER RD, Humboldt, CA

Built 1972 Load: 29.2 t ADT: 100

MAPLE CREEK ROAD

Fair

Over: HEATH CREEK

3.12 MI S BUTLER VLY RD, Humboldt, CA

Built 1961 Load: 29.5 t ADT: 17

ISHI PISHI ROAD

Fair

Over: WILSON CREEK

3.1 MI S JCT WITH SR 96, Humboldt, CA

Built 1975 Load: 29.5 t ADT: 132

U.S. HIGHWAY 101

Fair

Over: GIBNEY DRIVE

01-HUM-101-R22.44, Humboldt, CA

Built 1964 Load: 30.1 t ADT: 5,100

U.S. HIGHWAY 101

Fair

Over: BEAR CREEK

01-HUM-101-R42.99, Humboldt, CA

Built 1967 Load: 30.5 t ADT: 6,000

CAPPELL RD

Fair

Over: MAREEP CREEK

5.27 MI S JCT RTE 169, Humboldt, CA

Built 1965 Load: 30.5 t ADT: 150

STATE ROUTE 96

Fair

Over: HILLSIDE

01-HUM-096-16.82, Humboldt, CA

Built 1964 Load: 30.8 t ADT: 1,505

STATE ROUTE 254

Fair

Over: SOUTH FORK EEL RIVER

01-HUM-254-20.64, Humboldt, CA

Built 1931 Load: 31.1 t ADT: 460

U.S. HIGHWAY 101

Fair

Over: SOUTH FORK EEL RIVER

01-HUM-101-27.71, Humboldt, CA

Built 1962 Load: 31.1 t ADT: 5,000

PRICE CREEK ROAD

Fair

Over: SWEET CREEK

3.4 MI W BLUE SLIDE RD, Humboldt, CA

Built 1959 Load: 31.1 t ADT: 39

MAPLE CREEK RD

Fair

Over: CANYON CREEK

7.25 MI S INTX SR 299, Humboldt, CA

Built 1951 Load: 31.4 t ADT: 55

STATE ROUTE 299

Fair

Over: REDWOOD CREEK

01-HUM-299-R22.33, Humboldt, CA

Built 1965 Load: 31.8 t ADT: 3,200

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.