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)

MAPLE HILLS RD

Fair

Over: SOUTH FORK EEL RIVER

JUST N/E OF HWY 101, Humboldt, CA

Built 1957 Load: 35.6 t ADT: 1,005

U.S. HIGHWAY 101

Fair

Over: BOYD DRAW

01-HUM-101-89.44, Humboldt, CA

Built 1959 Load: 36.0 t ADT: 12,900

SMITH POINT

Fair

Over: SOUTH FORK EEL RIVER

OLD SMITH POINT, Humboldt, CA

Built 1934 Load: 36.0 t ADT: 69

BAIR ROAD

Fair

Over: SUPPLY CREEK

2 MI W OF LOOP RD, Humboldt, CA

Built 1950 Load: 36.3 t ADT: 69

STEELHEAD RD

Fair

Over: POWERS CREEK

2.5 MI E/O ALDERPOINT RD, Humboldt, CA

Built 2007 Load: 37.3 t ADT: 50

WILLIAMS CREEK RD

Fair

Over: WILLIAMS CREEK

1.6 MI S GRIZZLY BLUFF RD, Humboldt, CA

Built 1950 Load: 37.6 t ADT: 30

BRICELAND-THORNE

Fair

Over: CHINA CREEK

5.2 MI NE SHELTER COVE, Humboldt, CA

Built 1959 Load: 37.9 t ADT: 1,328

U.S. HIGHWAY 101

Fair

Over: PATRICKS POINT DR

01-HUM-101-R106.07, Humboldt, CA

Built 1970 Load: 38.9 t ADT: 4,200

ISHI PISHI RD

Fair

Over: RANGER FLAT DRAW

0.3 MI N JCT SR 96, Humboldt, CA

Built 1950 Load: 39.2 t ADT: 122

STATE ROUTE 211

Fair

Over: OLD RIVER

01-HUM-211-R76.30, Humboldt, CA

Built 1964 Load: 39.5 t ADT: 5,300

U.S. HIGHWAY 101

Fair

Over: E BRANCH S FRK EEL RIV

01-HUM-101-R8.80, Humboldt, CA

Built 1968 Load: 40.8 t ADT: 5,700

STATE ROUTE 36

Fair

Over: VAN DUZEN RIVER

01-HUM-036-20.21, Humboldt, CA

Built 1965 Load: 41.5 t ADT: 1,200

STATE ROUTE 299

Fair

Over: MAINT RD

01-HUM-299-R5.29, Humboldt, CA

Built 1965 Load: 41.5 t ADT: 9,700

WILDER RIDGE ROAD

Fair

Over: BEARTRAP CREEK

1.5 MI S MATTOLE RD, Humboldt, CA

Built 1960 Load: 41.8 t ADT: 128

U.S. HIGHWAY 101

Fair

Over: STRONGS CREEK

01-HUM-101-59.94, Humboldt, CA

Built 1962 Load: 42.1 t ADT: 13,000

S QUARRY ROAD

Fair

Over: JACOBY CREEK

0.05 MI S JACOBY CREEK RD, Humboldt, CA

Built 1971 Load: 42.1 t ADT: 115

U.S. HIGHWAY 101

Fair

Over: DEAN CRK RD & DEAN CREEK

01-HUM-101-R14.31, Humboldt, CA

Built 1967 Load: 42.4 t ADT: 5,000

SHIVELEY ROAD

Fair

Over: SHIVELEY CREEK

1.0 MI N OF SHIVELEY, Humboldt, CA

Built 1960 Load: 42.4 t ADT: 58

FORT SEWARD ROAD

Fair

Over: DOBBYN CREEK

1.5 MI W ALDER POINT RD, Humboldt, CA

Built 1960 Load: 43.4 t ADT: 38

CENTERVILLE ROAD

Fair

Over: FLEENER CREEK

2.3 MI WEST OF POOLE RD, Humboldt, CA

Built 1952 Load: 43.7 t ADT: 444

STATE ROUTE 211

Fair

Over: SALT RIVER OVERFLOW

01-HUM-211-R74.64, Humboldt, CA

Built 1964 Load: 44.1 t ADT: 5,700

UPPER BEAR RIV RD

Fair

Over: BEAR RIVER

8.0 MI S OF MATTOLE RD, Humboldt, CA

Built 1968 Load: 44.7 t ADT: 75

REDWOOD DR

Fair

Over: BEAR GULCH

0.2 MI N SR 101 AT GRBRVL, Humboldt, CA

Built 2004 Load: 44.7 t ADT: 5,870

MATTOLE ROAD

Fair

Over: WOODS CREEK

1.9 MI SW WILDER RDG RD, Humboldt, CA

Built 1976 Load: 45.4 t ADT: 171

MATTOLE ROAD

Fair

Over: SINGLEY CREEK

26.3 MI NORTH OF HONEYDEW, Humboldt, CA

Built 1959 Load: 45.7 t ADT: 308

U. BEAR RIVER ROAD

Fair

Over: ARROYO CREEK

6.5 MI S OF MATTOLE RD, Humboldt, CA

Built 1960 Load: 45.7 t ADT: 27

US HIGHWAY 101 SB

Fair

Over: SCENIC WAY

01-HUM-101-R53.38-RDEL, Humboldt, CA

Built 1976 Load: 46.3 t ADT: 4,400

US HIGHWAY 101 NB

Fair

Over: SCENIC WAY

01-HUM-101-R53.38-RDEL, Humboldt, CA

Built 1976 Load: 48.0 t ADT: 13,000

SPROWEL CREEK ROAD

Fair

Over: SPROWEL CREEK

3 MI SW/O KIMTU RD, Humboldt, CA

Built 1959 Load: 48.0 t ADT: 163

MATTOLE ROAD

Fair

Over: MATTOLE RIVER

SHIELD'S FORD, Humboldt, CA

Built 1973 Load: 49.6 t ADT: 196

THOMAS ROAD

Fair

Over: SALMON CREEK

3.24 MI S SALMON CK RD, Humboldt, CA

Built 1962 Load: 51.5 t ADT: 395

SALMON CREEK ROAD

Fair

Over: SALMON CREEK

2 MI W/OF HWY 101, Humboldt, CA

Built 1959 Load: 51.8 t ADT: 300

BLUE SLIDE ROAD

Fair

Over: PRICE CREEK

3.9 MI NW OF U.S.101, Humboldt, CA

Built 1959 Load: 53.1 t ADT: 302

ALDERPOINT RD

Fair

Over: LARABEE CREEK

32.2 MI E/N FROM SH 101, Humboldt, CA

Built 1960 Load: 53.8 t ADT: 107

US HIGHWAY 101

Fair

Over: STAFFORD ROAD

01-HUM-101-R47.95, Humboldt, CA

Built 1971 Load: 55.7 t ADT: 7,500

U.S. HIGHWAY 101

Fair

Over: BENBOW DR (OLD US 101)

01-HUM-101-R7.77, Humboldt, CA

Built 1975 Load: 56.1 t ADT: 5,700

MATTOLE ROAD

Fair

Over: BEAR RIVER

SOUTH OF PRESCOTT ROAD, Humboldt, CA

Built 1974 Load: 57.0 t ADT: 231

BURREL ROAD

Fair

Over: UPPER N FK MATTOLE RIV

0.5 MI W MATTOLE RD, Humboldt, CA

Built 1961 Load: 59.3 t ADT: 142

U.S. HIGHWAY 101

Fair

Over: BENBOW DR & S FK EEL RIV

01-HUM-101-R5.63, Humboldt, CA

Built 1980 Load: 68.7 t ADT: 4,500

STATE ROUTE 96

Fair

Over: HILLSIDE

01-HUM-096-16.84, Humboldt, CA

Built 1964 Load: 69.3 t ADT: 1,505

HOWE CREEK ROAD

Fair

Over: ATWELL CREEK

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

Built 1960 Load: 70.6 t ADT: 68

UPPER BEAR RIV RD

Fair

Over: BEAR RIVER

6.4 MI S OF MATTOLE ROAD, Humboldt, CA

Built 1960 Load: 78.7 t ADT: 27

NO DATA ENTERED

Good

Over: RED CAP CREEK

S19 T10N R6E, Humboldt, CA

Built 1977 ADT: 50

NO DATA ENTERED

Good

Over: N FORK RED CAP CREEK

NO DATA ENTERED, Humboldt, CA

Built 1967 ADT: 50

NO DATA ENTERED

Good

Over: GROUSE CREEK

NO DATA ENTERED, Humboldt, CA

Built 1997 ADT: 50

NO DATA ENTERED

Good

Over: NO DATA ENTERED

S15 T6N R4E, Humboldt, CA

Built 1974 ADT: 50

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Humboldt, CA

Built 1988 ADT: 50

NO DATA ENTERED

Good

Over: NO DATA ENTERED

S19 T2N R6E, Humboldt, CA

Built 1983 ADT: 50

TOMPKINS HILL ROAD

Good

Over: SALMON CREEK

0.8 MI SOUTH OF ROUTE 345, Humboldt, CA

Built 1929 Load: 15.2 t ADT: 179

MORGAN SLOUGH ROAD

Good

Over: MORGAN SLOUGH

NORTH OF CAMP WEOTT ROAD, Humboldt, CA

Built 1984 Load: 15.9 t ADT: 31

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.