US Bridges

US Highway 101 SB over Van Duzen River

Good

Humboldt County, California · 01-HUM-101-56.84 · Structure no. 04 0017L

Built
2007
18 years old
Condition
Good
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
813 ft
4 main spans
Daily traffic
13,000
2009 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 SB over Van Duzen River is a prestressed concrete continuous box beam or girders - multiple carrying US Highway 101 SB over Van Duzen River in Humboldt County, California. It was built in 2007, so it is 18 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 13,000 vehicles a day, roughly 12% of them trucks, projected to reach 15,820 by 2041. The structure is 813 ft (247.9 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS Highway 101 SB
CrossesVan Duzen River
Location01-HUM-101-56.84
RouteU.S. Route 101
Coordinates40.5367, -124.14791
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length813 ft (247.9 m)
Longest span220 ft (67.1 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2009)
Projected traffic15,820 by 2041
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 US Highway 101 SB over Van Duzen River built?

It was built in 2007, making it 18 years old in 2025.

What condition is US Highway 101 SB over Van Duzen River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does US Highway 101 SB over Van Duzen River carry?

About 13,000 vehicles per day (2009 count), of which roughly 12% are trucks.

How long is US Highway 101 SB over Van Duzen River?

The structure is 813 ft (247.9 m) long with a longest span of 220 ft (67.1 m) and a deck 42 ft wide.

Who owns US Highway 101 SB over Van Duzen River?

It is owned by the State Highway Agency.