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)

BUTLER VALLEY RD

Good

Over: MAPLE CREEK

0.2 MI W/O MAPLE CRK RD, Humboldt, CA

Built 1929 Load: 16.5 t ADT: 105

LAKE BENBOW DR

Good

Over: E BR SOUTH FORK EEL RIV

0.5 MI N SR 101, Humboldt, CA

Built 1932 Load: 17.2 t ADT: 627

STATE ROUTE 254

Good

Over: BEAR CREEK

01-HUM-254-43.02, Humboldt, CA

Built 1939 Load: 17.5 t ADT: 330

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Humboldt, CA

Built 1957 Load: 18.5 t ADT: 50

STATE ROUTE 299

Good

Over: MAD RIVER

01-HUM-299-R1.55, Humboldt, CA

Built 1948 Load: 18.8 t ADT: 4,775

STATE ROUTE 254

Good

Over: ELK CREEK

01-HUM-254-10.43, Humboldt, CA

Built 1940 Load: 19.1 t ADT: 565

FIELDBROOK RD

Good

Over: SQUAW CREEK

2.9 MI N/E OF RTE 299, Humboldt, CA

Built 1951 Load: 19.1 t ADT: 1,173

STATE ROUTE 254

Good

Over: OHMAN CREEK

01-HUM-254-0.88, Humboldt, CA

Built 1939 Load: 19.4 t ADT: 690

STATE ROUTE 299

Good

Over: NORTH FORK MAD RIVER

01-HUM-299-R11.02, Humboldt, CA

Built 1969 Load: 20.4 t ADT: 3,500

EEL RIVER DRIVE

Good

Over: SALMON CREEK

0.2 MI S OF US 101, Humboldt, CA

Built 1929 Load: 20.7 t ADT: 644

MYRTLE AVE

Good

Over: FRESHWATER CREEK

4.6 MI E/O SR 101, Humboldt, CA

Built 1983 Load: 22.7 t ADT: 7,009

CARSON WOODS ROAD

Good

Over: ROHNER CREEK

0.8 MI NORTH OF MAIN ST, Humboldt, CA

Built 1959 Load: 22.7 t ADT: 303

MATTOLE RD

Good

Over: CUNEO CREEK

7 MI W/O HWY 101, Humboldt, CA

Built 1966 Load: 23.0 t ADT: 1,000

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Humboldt, CA

Built 1978 Load: 23.3 t ADT: 50

ALDERPOINT RD

Good

Over: MCMAHON CREEK

14 MI N/O ALDERPOINT, Humboldt, CA

Built 1958 Load: 24.3 t ADT: 106

US HIGHWAY 101 NB

Good

Over: EUREKA SLOUGH

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

Built 1956 Load: 24.6 t ADT: 17,000

U.S. HIGHWAY 101

Good

Over: FINCH CREEK ROAD

01-HUM-101-63.10, Humboldt, CA

Built 1958 Load: 24.6 t ADT: 21,500

U.S. HIGHWAY 101

Good

Over: FINCH CREEK ROAD

01-HUM-101-63.10, Humboldt, CA

Built 1958 Load: 24.6 t ADT: 21,500

CARSON WOODS ROAD

Good

Over: ROHNER CREEK

0.3 MI N OF MAIN, Humboldt, CA

Built 1996 Load: 25.3 t ADT: 472

U.S. HIGHWAY 101

Good

Over: SALMON CREEK

01-HUM-101-67.87, Humboldt, CA

Built 1957 Load: 25.6 t ADT: 21,500

STATE ROUTE 36

Good

Over: HELY CREEK

01-HUM-036-11.46, Humboldt, CA

Built 1927 Load: 26.2 t ADT: 1,650

STATE ROUTE 254

Good

Over: BRIDGE CREEK

01-HUM-254-10.80, Humboldt, CA

Built 1938 Load: 26.6 t ADT: 565

STATE ROUTE 211

Good

Over: SALT RIVER

01-HUM-211-R75.15, Humboldt, CA

Built 1951 Load: 26.9 t ADT: 5,700

MYRTLE AVE

Good

Over: RYAN SLOUGH

2.9 MI E INTX WTH US 101, Humboldt, CA

Built 1955 Load: 26.9 t ADT: 8,530

EAST FRONTAGE ROAD

Good

Over: PEDESTRIAN WALKWAY

0.2 MI N 14TH ST, Humboldt, CA

Built 1976 Load: 26.9 t ADT: 2,000

STATE ROUTE 96

Good

Over: AIKENS CREEK

01-HUM-096-28.07, Humboldt, CA

Built 1960 Load: 27.5 t ADT: 560

U.S. HIGHWAY 101

Good

Over: ROHNER CREEK

01-HUM-101-60.67, Humboldt, CA

Built 1962 Load: 27.9 t ADT: 15,000

U.S. HIGHWAY 101

Good

Over: DIMMICK ROAD

01-HUM-101-R19.70, Humboldt, CA

Built 1964 Load: 27.9 t ADT: 5,900

STATE ROUTE 36

Good

Over: VAN DUZEN RIVER

01-HUM-036-12.78, Humboldt, CA

Built 1965 Load: 28.2 t ADT: 1,650

STOVER ROAD

Good

Over: MILL CREEK

2.5 MI FROM BAIR RD, Humboldt, CA

Built 1961 Load: 28.2 t ADT: 56

U.S. HIGHWAY 101

Good

Over: BEAR BUTTE ROAD

01-HUM-101-23.01, Humboldt, CA

Built 1962 Load: 28.8 t ADT: 5,100

US HIGHWAY 101 SB

Good

Over: N CENTRAL AVE

01-HUM-101-R95.62, Humboldt, CA

Built 1964 Load: 29.2 t ADT: 16,500

U.S. HIGHWAY 101

Good

Over: BARKDULL ROAD

01-HUM-101-R43.32, Humboldt, CA

Built 1966 Load: 29.8 t ADT: 6,890

U.S. HIGHWAY 101

Good

Over: HILLSIDE

01-HUM-101-27.07, Humboldt, CA

Built 1963 Load: 30.1 t ADT: 5,450

BENBOW DR

Good

Over: FISH CREEK

0.7 MI S/O N JCT HWY 101, Humboldt, CA

Built 1967 Load: 30.1 t ADT: 627

STATE ROUTE 96

Good

Over: BLUFF CREEK

01-HUM-096-28.27, Humboldt, CA

Built 1960 Load: 30.5 t ADT: 560

STATE ROUTE 96

Good

Over: KLAMATH RIVER (ORLEANS)

01-HUM-096-38.57, Humboldt, CA

Built 1966 Load: 30.5 t ADT: 990

MATTOLE RD

Good

Over: BULL CREEK

6.4 MI W/O JCT W/ SR 101, Humboldt, CA

Built 1966 Load: 30.5 t ADT: 500

U.S. HIGHWAY 101

Good

Over: REDWOOD CREEK OVERFLOW

01-HUM-101-120.02, Humboldt, CA

Built 1950 Load: 31.4 t ADT: 3,750

N101-DEAN CRK RD

Good

Over: DEAN CREEK

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

Built 1967 Load: 31.8 t ADT: 310

US HIGHWAY 101 SB

Good

Over: VAN DUZEN RIVER OVERFLOW

01-HUM-101-57.36, Humboldt, CA

Built 1952 Load: 31.8 t ADT: 4,400

US HIGHWAY 101 NB

Good

Over: VAN DUZEN RIVER OVERFLOW

01-HUM-101-57.36, Humboldt, CA

Built 1952 Load: 31.8 t ADT: 4,400

US HIGHWAY 101 NB

Good

Over: JORDAN CREEK

01-HUM-101-R46.19, Humboldt, CA

Built 1966 Load: 31.8 t ADT: 6,000

U.S. HIGHWAY 101

Good

Over: RICHARDSON GROVE PARK RD

01-HUM-101-1.61, Humboldt, CA

Built 1958 Load: 32.1 t ADT: 4,500

STATE ROUTE 36

Good

Over: LITTLE LARABEE CREEK

01-HUM-036-25.27, Humboldt, CA

Built 1960 Load: 32.1 t ADT: 1,200

US HIGHWAY 101 SB

Good

Over: EEL RIVER

01-HUM-101-M53.97-RDEL, Humboldt, CA

Built 1974 Load: 32.4 t ADT: 4,400

US HIGHWAY 101 SB

Good

Over: VAN DUZEN RIVER

01-HUM-101-56.84, Humboldt, CA

Built 2007 Load: 32.4 t ADT: 13,000

US HIGHWAY 101 NB

Good

Over: VAN DUZEN RIVER

01-HUM-101-56.84, Humboldt, CA

Built 1996 Load: 32.4 t ADT: 6,800

U.S. HIGHWAY 101

Good

Over: LITTLE RIVER

01-HUM-101-R97.46, Humboldt, CA

Built 1964 Load: 32.4 t ADT: 10,500

U.S. HIGHWAY 101

Good

Over: REDWOOD CREEK

01-HUM-101-121.09, Humboldt, CA

Built 1988 Load: 32.4 t ADT: 3,750

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