US Bridges

State Route 36 over South Fork Van Duzen Riv

Fair

Humboldt County, California · 01-HUM-036-35.37 · Structure no. 04 0119

Built
1962
63 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
207 ft
2 main spans
Daily traffic
1,200
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 36 over South Fork Van Duzen Riv is a steel stringer/multi-beam or girder carrying State Route 36 over South Fork Van Duzen Riv in Humboldt County, California. It was built in 1962, so it is 63 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 1,353 by 2042. The structure is 207 ft (63 m) long and 34 ft wide. If it were closed, the detour would be 75.8 mi (122 km).

Location

Open in Google Maps
CarriesState Route 36
CrossesSouth Fork Van Duzen Riv
Location01-HUM-036-35.37
RouteState Highway 36
CountyHumboldt County
StateCalifornia
Coordinates40.44409, -123.65689
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length207 ft (63 m)
Longest span100 ft (30.5 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2009)
Projected traffic1,353 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.8 mi (122 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 South Fork Van Duzen Riv built?

It was built in 1962, making it 63 years old in 2025.

What condition is State Route 36 over South Fork Van Duzen Riv 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 South Fork Van Duzen Riv carry?

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

How long is State Route 36 over South Fork Van Duzen Riv?

The structure is 207 ft (63 m) long with a longest span of 100 ft (30.5 m) and a deck 34 ft wide.

Who owns State Route 36 over South Fork Van Duzen Riv?

It is owned by the State Highway Agency.