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: TURNER DRAW

01-HUM-101-89.18, Humboldt, CA

Built 1956 Load: 32.1 t ADT: 12,900

ISLAND MOUNTAIN RD

Fair

Over: CHAMISE CREEK

5.7 MI E/O BELLSPRINGS RD, Humboldt, CA

Built 1973 Load: 32.1 t ADT: 100

NISSEN LANE

Fair

Over: NISSEN SLOUGH

0.7 MI NORTH OF GOBLE LN, Humboldt, CA

Built 1952 Load: 32.1 t ADT: 13

US HIGHWAY 101 NB

Fair

Over: EEL RIVER

01-HUM-101-M53.91-RDEL, Humboldt, CA

Built 1941 Load: 32.4 t ADT: 4,400

US HIGHWAY 101 SB

Fair

Over: GANNON SLOUGH

01-HUM-101-84.70, Humboldt, CA

Built 1996 Load: 32.4 t ADT: 17,500

U.S. HIGHWAY 101

Fair

Over: PRAIRIE CREEK

01-HUM-101-122.86, Humboldt, CA

Built 1989 Load: 32.4 t ADT: 3,700

STATE ROUTE 36

Fair

Over: VAN DUZEN RIVER

01-HUM-036-13.37, Humboldt, CA

Built 1984 Load: 32.4 t ADT: 1,650

STATE ROUTE 169

Fair

Over: COON CREEK

01-HUM-169-25.81, Humboldt, CA

Built 1988 Load: 32.4 t ADT: 320

US HIGHWAY 101 SB

Fair

Over: EEL RIV,EDWARDS DR,NCRRA

01-HUM-101-R51.99, Humboldt, CA

Built 1976 Load: 32.4 t ADT: 8,200

STATE ROUTE 255

Fair

Over: MCDANIEL SLOUGH

01-HUM-255-7.77, Humboldt, CA

Built 1963 Load: 32.4 t ADT: 4,160

STATE ROUTE 255

Fair

Over: EUREKA CHANNEL

01-HUM-255-0.20-EUR, Humboldt, CA

Built 1971 Load: 32.4 t ADT: 7,300

STATE ROUTE 255

Fair

Over: MARINA ROAD

01-HUM-255-0.66-EUR, Humboldt, CA

Built 1979 Load: 32.4 t ADT: 7,300

U.S. HIGHWAY 101

Fair

Over: NEWTON B DRURY SCENIC PK

01-HUM-101-R126.10, Humboldt, CA

Built 1990 Load: 32.4 t ADT: 3,100

U.S. HIGHWAY 101

Fair

Over: BOYES CREEK

01-HUM-101-R128.97, Humboldt, CA

Built 1989 Load: 32.4 t ADT: 3,100

STATE ROUTE 96

Fair

Over: HILLSIDE

01-HUM-096-8.31, Humboldt, CA

Built 1985 Load: 32.4 t ADT: 2,900

STATE ROUTE 169

Fair

Over: MINERS CREEK

01-HUM-169-26.97, Humboldt, CA

Built 1995 Load: 32.4 t ADT: 320

STATE ROUTE 169

Fair

Over: CAPPELL CREEK

01-HUM-169-22.37, Humboldt, CA

Built 2012 Load: 32.4 t ADT: 2,000

US HIGHWAY 101 NB

Fair

Over: MAD RIVER

01-HUM-101-89.63, Humboldt, CA

Built 2012 Load: 32.4 t ADT: 16,500

DILLON ROAD

Fair

Over: SALT RIVER

N OF PORT KENYON RD, Humboldt, CA

Built 1994 Load: 32.4 t ADT: 371

HATCHERY ROAD

Fair

Over: MAD RIVER

JUST S/O BLUE LAKE, Humboldt, CA

Built 1983 Load: 32.4 t ADT: 1,016

WILDER RIDGE RD

Fair

Over: HONEYDEW CREEK

2 MI S MATTOLE RD, Humboldt, CA

Built 1990 Load: 32.4 t ADT: 189

BRIDGE ST

Fair

Over: SCOTIA MILL POND

NEAR JCT MAIN ST SCOTIA, Humboldt, CA

Built 1974 Load: 32.4 t ADT: 1,055

FORTUNA BOULEVARD

Fair

Over: STRONGS CREEK

0.2 MI N/O KENMAR RD, Humboldt, CA

Built 1949 Load: 32.4 t ADT: 11,988

BEAR CANYON ROAD

Fair

Over: SOUTH FORK EEL RIVER

0.3 MI SW/O REDWOOD DR, Humboldt, CA

Built 2000 Load: 32.4 t ADT: 158

PRICE CREEK ROAD

Fair

Over: PRICE CREEK

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

Built 1981 Load: 32.4 t ADT: 82

ALDERPOINT RD

Fair

Over: SOUTH DOBBYN CREEK

2.1 MI N ALDERPOINT, Humboldt, CA

Built 1937 Load: 32.4 t ADT: 281

DAVISON RD

Fair

Over: PRAIRIE CREEK

0.2 MI W JCT WITH SR 101, Humboldt, CA

Built 1988 Load: 32.4 t ADT: 875

KING SALMON DR

Fair

Over: KING SALMON SLOUGH

1/4 MI NW OF SR 101, Humboldt, CA

Built 1988 Load: 32.4 t ADT: 1,782

MATTOLE ROAD

Fair

Over: MCNUTT CREEK

3.6 MI NW OF PETROLIA, Humboldt, CA

Built 1996 Load: 32.4 t ADT: 180

NORTH FORK ROAD

Fair

Over: MATTOLE CREEK

1.5 MI N/O MATTOLE RD, Humboldt, CA

Built 1996 Load: 32.4 t ADT: 30

CONKLIN CREEK ROAD

Fair

Over: EAST MILL CREEK

0.2 MI E/O MATTOLE RD, Humboldt, CA

Built 2003 Load: 32.4 t ADT: 20

WILLIAMS CREEK RD

Fair

Over: WILLIAMS CREEK

0.1 MI S OF GRIZZLY BLUFF, Humboldt, CA

Built 2016 Load: 32.4 t ADT: 130

WADDINGTON RD

Fair

Over: SALT RIVER

1.1 MI N/O GRIZZLY BLUFF, Humboldt, CA

Built 2016 Load: 32.4 t ADT: 890

MATTOLE RD

Fair

Over: BULL CREEK

5.3 MI W/O HWY 101, Humboldt, CA

Built 1956 Load: 32.4 t ADT: 310

MATTOLE RD

Fair

Over: HARPER CREEK

4.3 MI W/O HWY 101, Humboldt, CA

Built 1977 Load: 32.4 t ADT: 600

REDWOOD HWY

Fair

Over: MAY CREEK

PRAIRIE CR REDWOOD ST PK, Humboldt, CA

Built 1989 Load: 32.4 t ADT: 5,450

IRR BIA RTE 541A

Fair

Over: SUPPLY CREEK

N SIDE OF HOOPA LOOP ROAD, Humboldt, CA

Built 1966 Load: 32.4 t ADT: 1,500

US HIGHWAY 101 SB

Fair

Over: ELK RIVER

01-HUM-101-74.60, Humboldt, CA

Built 1956 Load: 32.7 t ADT: 16,200

STATE ROUTE 96

Fair

Over: TRINITY RIVER

01-HUM-096-12.26, Humboldt, CA

Built 1957 Load: 32.7 t ADT: 1,505

CANNIBAL ROAD

Fair

Over: MOSLEY SLOUGH

3.7 MI W OF EEL RIVER DR., Humboldt, CA

Built 1959 Load: 32.7 t ADT: 434

PORT KENYON ROAD

Fair

Over: SALT RIVER OVERFLOW

0.24 MI W HIGHWAY 211, Humboldt, CA

Built 1962 Load: 32.7 t ADT: 351

DAVISON ROAD

Fair

Over: PRAIRIE CREEK

Approximately 0.2 miles f, Humboldt, CA

Built 1970 Load: 32.7 t ADT: 50

STATE ROUTE 96

Fair

Over: CAMP CREEK

01-HUM-096-R37.25, Humboldt, CA

Built 1949 Load: 33.4 t ADT: 1,085

BRICELAND-THORNE

Fair

Over: REDWOOD CREEK

2.3 MI W/O REDWOOD DR, Humboldt, CA

Built 1959 Load: 33.4 t ADT: 1,836

STATE ROUTE 96

Fair

Over: KLAMATH RIVER

01-HUM-096-22.95, Humboldt, CA

Built 1949 Load: 33.7 t ADT: 710

STATE ROUTE 299

Fair

Over: BLUE LAKE BLVD

01-HUM-299-R5.45, Humboldt, CA

Built 1970 Load: 33.7 t ADT: 9,700

U.S. HIGHWAY 101

Fair

Over: MAPLE HILL RD,SALMON CRK

01-HUM-101-23.89, Humboldt, CA

Built 1962 Load: 34.7 t ADT: 5,100

BRICELAND THORN RD

Fair

Over: VANARKEN CREEK

1.0 MI S SHELTER COVE RD, Humboldt, CA

Built 1961 Load: 35.0 t ADT: 420

U.S. HIGHWAY 101

Fair

Over: TRINIDAD ROAD

01-HUM-101-100.71-TRND, Humboldt, CA

Built 1960 Load: 35.3 t ADT: 4,900

U.S. HIGHWAY 101

Fair

Over: SEAWOOD DR

01-HUM-101-R103.38, Humboldt, CA

Built 1970 Load: 35.3 t ADT: 4,200

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

Related

Browse all → | Rankings →
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.