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)

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

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.