US Bridges

State Route 36 over Van Duzen River

Fair

Humboldt County, California · 01-HUM-036-20.21 · Structure no. 04 0098

Built
1965
60 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
376 ft
3 main spans
Daily traffic
1,200
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 36 over Van Duzen River is a concrete continuous box beam or girders - multiple carrying State Route 36 over Van Duzen River in Humboldt County, California. It was built in 1965, so it is 60 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,200 vehicles a day, projected to reach 2,289 by 2042. The structure is 376 ft (114.7 m) long and 34 ft wide. If it were closed, the detour would be 47.2 mi (76 km).

Location

Open in Google Maps
CarriesState Route 36
CrossesVan Duzen River
Location01-HUM-036-20.21
RouteState Highway 36
CountyHumboldt County
StateCalifornia
Coordinates40.46451, -123.85955
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating45.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length376 ft (114.7 m)
Longest span125 ft (38.1 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2009)
Projected traffic2,289 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.2 mi (76 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 36 over Van Duzen River built?

It was built in 1965, making it 60 years old in 2025.

What condition is State Route 36 over Van Duzen River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does State Route 36 over Van Duzen River carry?

About 1,200 vehicles per day (2009 count).

How long is State Route 36 over Van Duzen River?

The structure is 376 ft (114.7 m) long with a longest span of 125 ft (38.1 m) and a deck 34 ft wide.

Who owns State Route 36 over Van Duzen River?

It is owned by the State Highway Agency.