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)

U.S. HIGHWAY 101

Fair

Over: JONES SLOUGH

01-HUM-101-88.87, Humboldt, CA

Built 1959 Load: 14.3 t ADT: 12,900

BRICELAND-THORNE

Fair

Over: REDWOOD CREEK

3.3 MI W JCT US 101, Humboldt, CA

Built 1938 Load: 14.3 t ADT: 1,836

ALDERPOINT ROAD

Fair

Over: COOPER CREEK

30.4 MI E/N S.H. 101, Humboldt, CA

Built 1952 Load: 14.3 t ADT: 250

ELK RIVER ROAD

Fair

Over: NORTH FORK ELK RIVER

NE PEPPER ST, Humboldt, CA

Built 1923 Load: 14.6 t ADT: 156

PRICE CREEK ROAD

Fair

Over: PRICE CREEK

0.2 MI W/O BLUE SLIDE RD, Humboldt, CA

Built 1940 Load: 14.6 t ADT: 118

ARLINGTON AVENUE

Fair

Over: FRANCIS CREEK

JUST W SR 211 IN FERNDALE, Humboldt, CA

Built 2001 Load: 15.2 t ADT: 500

COFFEE CREEK ROAD

Fair

Over: PERRY SLOUGH

0.2 MI SOUTH OF RTE 211, Humboldt, CA

Built 1931 Load: 15.6 t ADT: 254

STATE ROUTE 36

Fair

Over: YAGER CREEK

01-HUM-036-4.86, Humboldt, CA

Built 1968 Load: 15.9 t ADT: 2,800

BRICELAND RD

Fair

Over: REDWOOD CREEK

10 MI E SHELTER COVE RD, Humboldt, CA

Built 1935 Load: 16.2 t ADT: 1,836

MAPLE CREEK ROAD

Fair

Over: BOULDER CREEK

1/4 MI E BUTLER VLY RD, Humboldt, CA

Built 1923 Load: 16.2 t ADT: 106

ALDERPOINT RD

Fair

Over: MARTIN CREEK

6.7 MI SOUTH BRIDGEVILLE, Humboldt, CA

Built 1972 Load: 16.2 t ADT: 124

JACK SHAW ROAD

Fair

Over: BILLINGS CREEK

1.3 MI E MOUNTAIN VIEW, Humboldt, CA

Built 1987 Load: 16.2 t ADT: 50

12TH ST

Fair

Over: ROHNER CREEK

0.1 MILE NORTH NEWBURG RD, Humboldt, CA

Built 1935 Load: 16.2 t ADT: 3,160

MAIN STREET

Fair

Over: ROHNER CREEK

JUST EAST OF 16TH STREET, Humboldt, CA

Built 1922 Load: 16.5 t ADT: 11,181

HOLMES FLAT RD

Fair

Over: EEL RIVER

NEAR HOLMES, Humboldt, CA

Built 1999 Load: 16.7 t ADT: 100

ETSBRG HNYDEW RD

Fair

Over: MATTOLE RIVER

5.77 MI N/O THORNE RD, Humboldt, CA

Built 1928 Load: 16.8 t ADT: 200

HOWE CREEK ROAD

Fair

Over: HOWE CREEK

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

Built 2006 Load: 16.8 t ADT: 19

FULMOR ROAD

Fair

Over: SALT RIVER

NORTH OF KENYON ROAD, Humboldt, CA

Built 1950 Load: 17.2 t ADT: 246

REDWOOD DR

Fair

Over: DEAN CREEK

N/O REDWAY ADJ TO US 101, Humboldt, CA

Built 1933 Load: 17.2 t ADT: 1,978

SHOWER PASS RD

Fair

Over: OLSEN CREEK

6.1 MI NE/O KNEELAND RD, Humboldt, CA

Built 1966 Load: 17.2 t ADT: 7

STATE ROUTE 96

Fair

Over: HILLSIDE

01-HUM-096-8.26, Humboldt, CA

Built 1985 Load: 17.5 t ADT: 2,900

ZANES RD

Fair

Over: ELK RIVER

0.1 MI W ELK RIVER RD, Humboldt, CA

Built 1936 Load: 17.5 t ADT: 38

OLD MATTOLE RD

Fair

Over: MCNUTT CREEK

0.49 MI N OF MATTOLE RD, Humboldt, CA

Built 1926 Load: 17.5 t ADT: 100

BERTA RD

Fair

Over: ELK RIVER

0.14 MI W ELK RIVER RD, Humboldt, CA

Built 1936 Load: 17.8 t ADT: 518

ALBERT ETTER RA RD

Fair

Over: BEAR CREEK

0.2 MI SW/O ETRSBG-HNYDW, Humboldt, CA

Built 1985 Load: 17.8 t ADT: 50

BAIR ROAD

Fair

Over: REDWOOD CREEK

3.4 MI N/O SR 299, Humboldt, CA

Built 1950 Load: 18.1 t ADT: 113

BRICELAND ROAD

Fair

Over: REDWOOD CREEK

0.1 MI E BRICELND THO RD, Humboldt, CA

Built 1949 Load: 18.1 t ADT: 250

WHITLOW ROAD

Fair

Over: SONOMA CREEK #2

2.4 MI E OF ELK CREEK RD, Humboldt, CA

Built 1966 Load: 18.8 t ADT: 53

WHITLOW ROAD

Fair

Over: SONOMA CREEK #1

2.2 MI E OF ELK CREEK RD, Humboldt, CA

Built 1966 Load: 18.8 t ADT: 53

FOREST ROAD

Fair

Over: SOUTH FORK EEL RIVER

0.1 MI W/O REDWOOD DR, Humboldt, CA

Built 1965 Load: 18.8 t ADT: 110

ELINOR ROAD

Fair

Over: GREENLOW CREEK

0.3 MILE NE OF ROUTE 254, Humboldt, CA

Built 1988 Load: 19.1 t ADT: 20

MATTOLE RD

Fair

Over: DRY CREEK

1 MI S/O SINGLEY CREEK, Humboldt, CA

Built 1985 Load: 19.4 t ADT: 196

ALDERPOINT RD

Fair

Over: CONLEY CREEK

1 MI S OF BLOCKSBURG, Humboldt, CA

Built 1990 Load: 20.1 t ADT: 114

BRICELAND-THORNE

Fair

Over: MCKEE CREEK

0.1 MI S/O SHELTER COVE, Humboldt, CA

Built 1952 Load: 20.1 t ADT: 420

STATE ROUTE 283

Fair

Over: EEL RIVER & NWP RR

01-HUM-283-0.12, Humboldt, CA

Built 1941 Load: 20.4 t ADT: 2,150

HOWARD HEIGHTS RD

Fair

Over: FRESHWATER CREEK

0.01 MI SW FRESHWATER RD, Humboldt, CA

Built 1949 Load: 20.4 t ADT: 172

BROOKWOOD DRIVE

Fair

Over: JACOBY CREEK

0.1 MI S/O JACOBY CRK RD, Humboldt, CA

Built 1967 Load: 20.4 t ADT: 162

STATE ROUTE 299

Fair

Over: EAST FORK WILLOW CREEK

01-HUM-299-33.21, Humboldt, CA

Built 1956 Load: 20.7 t ADT: 3,200

STATE ROUTE 255

Fair

Over: SAMOA CHANNEL

01-HUM-255-1.37-EUR, Humboldt, CA

Built 1971 Load: 20.7 t ADT: 7,300

BRICELAND ROAD

Fair

Over: REDWOOD CREEK (REDWAY)

WHITTEMORE STATE PARK, Humboldt, CA

Built 1938 Load: 20.7 t ADT: 260

COUNTRY CLUB RD

Fair

Over: TRINITY RIVER

IN WILLOW CREEK, Humboldt, CA

Built 1957 Load: 21.1 t ADT: 2,947

MATTOLE ROAD

Fair

Over: NORTH FORK MATTOLE RIVER

1.3 NW OF MATTOLE RIVER, Humboldt, CA

Built 1961 Load: 21.1 t ADT: 219

BRICELAND-THORNE

Fair

Over: SOUTH FORK EEL RIVER

1.1 MI W JCT OLD RTE 101, Humboldt, CA

Built 1966 Load: 21.4 t ADT: 2,468

STATE ROUTE 299

Fair

Over: WILLOW CREEK

01-HUM-299-34.56, Humboldt, CA

Built 1955 Load: 21.7 t ADT: 3,200

ISHI PISHI RD

Fair

Over: KLAMATH RIVER

0.5 MI SW OF SR 96, Humboldt, CA

Built 1967 Load: 21.7 t ADT: 71

BUTLER VALLEY RD

Fair

Over: MAD RIVER

0.1 MI E/O BLACK CRK LN, Humboldt, CA

Built 1937 Load: 22.0 t ADT: 105

WEST END ROAD

Fair

Over: WARREN CREEK

0.2 MI S WARREN CREEK RD, Humboldt, CA

Built 1927 Load: 22.0 t ADT: 472

ROHNERVILLE ROAD

Fair

Over: STRONGS CREEK

0.3 MI W OF NEWBURG RD, Humboldt, CA

Built 1915 Load: 22.4 t ADT: 4,924

US HIGHWAY 101 SB

Fair

Over: EUREKA SLOUGH

01-HUM-101-79.78-EUR, Humboldt, CA

Built 1943 Load: 22.7 t ADT: 17,000

U.S. HIGHWAY 101

Fair

Over: GREENLAW CREEK

01-HUM-101-R45.57, Humboldt, CA

Built 1966 Load: 22.7 t ADT: 6,100

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.