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)

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

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

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

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

STATE ROUTE 211

Structurally Deficient

Over: EEL RIVER

01-HUM-211-78.10, Humboldt, CA

Built 1911 ADT: 5,300

NO DATA ENTERED

Structurally Deficient

Over: NO DATA ENTERED

S21 T1N R6E, Humboldt, CA

Built 1980 Load: 25.6 t ADT: 50

33007: BUTTE CREEK

Structurally Deficient

Over: Butte Creek

40 mi. SE of Fortuna, Humboldt, CA

Built 1980 Load: 29.5 t ADT: 50

Read our methodology — how this data is sourced, computed, and verified.

Related

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