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)

US HIGHWAY 101 NB

Good

Over: JACOBY CREEK

01-HUM-101-84.50-ARC, Humboldt, CA

Built 1955 Load: 36.0 t ADT: 18,125

BENBOW DRIVE

Good

Over: E BR SOUTH FORK EEL RIV

0.5 MI N/O OAKCREST CT, Humboldt, CA

Built 1970 Load: 36.3 t ADT: 316

NO DATA ENTERED

Good

Over: NO DATA ENTERED

S16 T6N R6E, Humboldt, CA

Built 1966 Load: 36.6 t ADT: 50

JACKSON RANCH RD

Good

Over: LISCOMB SLOUGH

0.25 MI S FOSTER AVE, Humboldt, CA

Built 1960 Load: 38.2 t ADT: 327

SPROWEL CREEK ROAD

Good

Over: SOUTH FORK EEL RIVER

1.4 MI SW OF INTER W/101, Humboldt, CA

Built 1982 Load: 38.6 t ADT: 1,085

HOLMES FLAT RD

Good

Over: LARABEE CREEK

2.5 MI E AVE OF GIANTS, Humboldt, CA

Built 1966 Load: 38.6 t ADT: 17

U.S. HIGHWAY 101

Good

Over: ORCHARD AVE

01-HUM-101-72.03, Humboldt, CA

Built 1963 Load: 39.2 t ADT: 25,700

SHELTER COVE RD

Good

Over: MATTOLE RIVER

0.7 MI W/O BRICELAND RD, Humboldt, CA

Built 1981 Load: 39.9 t ADT: 1,302

STATE ROUTE 96

Good

Over: HILLSIDE

01-HUM-096-16.76, Humboldt, CA

Built 1966 Load: 41.8 t ADT: 1,505

STOVER RD

Good

Over: MOLASSES CREEK

2.1 MI N JCT BAIR RD, Humboldt, CA

Built 1962 Load: 41.8 t ADT: 56

DINSMORE DRIVE

Good

Over: ROHNER CREEK

0.3 MI N INT WTH 12TH ST, Humboldt, CA

Built 1962 Load: 42.8 t ADT: 556

U.S. HIGHWAY 101

Good

Over: MCDONALD CREEK

01-HUM-101-114.54, Humboldt, CA

Built 1972 Load: 43.1 t ADT: 4,300

STATE ROUTE 96

Good

Over: PEARCH CREEK

01-HUM-096-R39.48, Humboldt, CA

Built 1974 Load: 43.7 t ADT: 400

REDWOOD WAY

Good

Over: STRONGS CREEK

1/2 MI E FORTUNA BL, Humboldt, CA

Built 1988 Load: 44.1 t ADT: 4,353

US HIGHWAY 101 NB

Good

Over: GANNON SLOUGH

01-HUM-101-84.70-ARC, Humboldt, CA

Built 1955 Load: 45.0 t ADT: 17,500

NO DATA ENTERED

Good

Over: NO DATA ENTERED

S21 T6N R5E, Humboldt, CA

Built 1981 Load: 47.6 t ADT: 50

HOWE CREEK ROAD

Good

Over: HOWE CREEK

1.0 MI S/O BLUE SLIDE RD, Humboldt, CA

Built 1980 Load: 54.8 t ADT: 68

U.S. HIGHWAY 101

Good

Over: SOUTH FORK EEL RIVER

01-HUM-101-R8.30, Humboldt, CA

Built 1969 Load: 62.9 t ADT: 5,700

U.S. HIGHWAY 101

Good

Over: PACIFIC LUMBER CO RD

01-HUM-101-R51.08, Humboldt, CA

Built 1979 Load: 72.3 t ADT: 10,800

NO DATA ENTERED

Good

Over: 051054000001005

S9 T1N R5E, Humboldt, CA

Built 1973 Load: 90.8 t ADT: 50

STATE ROUTE 169

Good

Over: PECWAN CREEK

01-HUM-169-14.46, Humboldt, CA

Built 1961 Load: 96.6 t ADT: 260

GENEVA ROAD

Good

Over: LOST MAN CREEK

0.8 miles east of Jct. Hw, Humboldt, CA

Built 2021 Load: 99.9 t ADT: 120

GENEVA ROAD

Good

Over: LITTLE LOST MAN CREEK

0.3 miles east of Jct. Hw, Humboldt, CA

Built 2021 Load: 99.9 t ADT: 120

STATE ROUTE 211

Poor

Over: EEL RIVER

01-HUM-211-78.10, Humboldt, CA

Built 1911 ADT: 5,300

LINDLEY ROAD

Poor

Over: MATTOLE RIVER

0.5 MI NE MATTOLE RD, Humboldt, CA

Built 1925 Load: 8.1 t ADT: 50

MATTOLE RD

Poor

Over: MATTOLE RIVER

E OF JCT WILDER RIDGE RD, Humboldt, CA

Built 1920 Load: 12.3 t ADT: 514

MATTOLE RD

Poor

Over: DOMINGO CREEK

21.2 MI N/O HONEYDEW, Humboldt, CA

Built 1926 Load: 14.3 t ADT: 183

HOLMES FLAT ROAD

Poor

Over: LARABEE LOW LEVEL-EEL RI

NEAR HOLMES, Humboldt, CA

Built 1960 Load: 14.3 t ADT: 100

MATTOLE RD

Poor

Over: MATTOLE RIVER

0.8 MI SOUTH OF PETROLIA, Humboldt, CA

Built 1958 Load: 17.8 t ADT: 412

MATTOLE ROAD

Poor

Over: MATTOLE RIVER

8.0 MI N/O HONEYDEW, Humboldt, CA

Built 1935 Load: 18.1 t ADT: 205

U.S. HIGHWAY 101

Poor

Over: BIG LAGOON

01-HUM-101-109.17, Humboldt, CA

Built 1958 Load: 19.8 t ADT: 4,200

MAPLE CREEK RD

Poor

Over: MAPLE CREEK

12.5 MI SE OF KORBEL, Humboldt, CA

Built 1955 Load: 20.1 t ADT: 38

ALBEE CK CAMP

Poor

Over: ALBEE CREEK

HUMBOLDT REDWOOD ST. PK., Humboldt, CA

Built 1986 Load: 23.7 t ADT: 10

SALMON CREEK ROAD

Poor

Over: SALMON CREEK

2.65 MI AVE OF THE GIANTS, Humboldt, CA

Built 1959 Load: 25.3 t ADT: 226

NO DATA ENTERED

Poor

Over: NO DATA ENTERED

S21 T1N R6E, Humboldt, CA

Built 1980 Load: 25.6 t ADT: 50

MAPLE CREEK ROAD

Poor

Over: NORTH FORK MAD RIVER

IN KORBEL, Humboldt, CA

Built 1928 Load: 28.5 t ADT: 624

HOOKTON ROAD

Poor

Over: SALMON CREEK

0.1 MI W EEL RIVER DR, Humboldt, CA

Built 1922 Load: 28.5 t ADT: 486

33007: BUTTE CREEK

Poor

Over: Butte Creek

40 mi. SE of Fortuna, Humboldt, CA

Built 1980 Load: 29.5 t ADT: 50

ZENIA BLUFF RD

Poor

Over: SOUTH DOBBYN CREEK

2 MI E/O ALDERPOINT RD, Humboldt, CA

Built 1949 Load: 30.5 t ADT: 85

COCKROBIN ISLD RD

Poor

Over: EEL RIVER

0.5 MI S OF CANNIBAL RD, Humboldt, CA

Built 1961 Load: 30.5 t ADT: 25

GRASSHOPPER LKT RD

Poor

Over: SQUAW CREEK

2 MI S/O MATTOLE RD, Humboldt, CA

Built 1983 Load: 32.4 t ADT: 1

STATE ROUTE 299

Poor

Over: MAD RIVER

01-HUM-299-R1.56, Humboldt, CA

Built 1965 Load: 33.4 t ADT: 4,775

STATE ROUTE 96

Poor

Over: WILLOW CREEK

01-HUM-096-0.24, Humboldt, CA

Built 1965 Load: 36.6 t ADT: 2,900

STATE PARK ROAD

Poor

Over: SOUTH FORK EEL RIVER

BENBOW STATE PARK, Humboldt, CA

Built 1969 Load: 37.6 t ADT: 1,100

ALDERPOINT ROAD

Poor

Over: BURR CREEK

4 MI S OF SR 36, Humboldt, CA

Built 1960 Load: 39.2 t ADT: 173

KNEELAND RD

Poor

Over: NORTH FORK YAGER CREEK

14.3 MI N OF BRIDGEVILLE, Humboldt, CA

Built 1964 Load: 42.8 t ADT: 10

BALD HILLS ROAD

Poor

Over: PRAIRIE CREEK

0.01 MI E/O SR 101, Humboldt, CA

Built 1957 Load: 63.8 t ADT: 479

PRESCOTT DRIVE

Poor

Over: JOHNSON GULCH

2.2 MI EAST OF MATTOLE RD, Humboldt, CA

Built 1973 Load: 67.7 t ADT: 9

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.