US Bridges

U.S. Highway 101 over Westhaven Drive

Fair

Humboldt County, California · 01-HUM-101-98.07 · Structure no. 04 0056

Built
1960
65 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
134 ft
3 main spans
Daily traffic
8,800
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Westhaven Drive is a concrete continuous tee beam carrying U.S. Highway 101 over Westhaven Drive in Humboldt County, California. It was built in 1960, so it is 65 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 8,800 vehicles a day, roughly 15% of them trucks, projected to reach 14,882 by 2042. The structure is 134 ft (40.8 m) long and 63 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesU.S. Highway 101
CrossesWesthaven Drive
Location01-HUM-101-98.07
RouteU.S. Route 101
CountyHumboldt County
StateCalifornia
Coordinates41.03205, -124.10994
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span60 ft (18.3 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,800 (2009)
Projected traffic14,882 by 2042
Trucks15%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was U.S. Highway 101 over Westhaven Drive built?

It was built in 1960, making it 65 years old in 2025.

What condition is U.S. Highway 101 over Westhaven Drive 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 July 2024.

How much traffic does U.S. Highway 101 over Westhaven Drive carry?

About 8,800 vehicles per day (2009 count), of which roughly 15% are trucks.

How long is U.S. Highway 101 over Westhaven Drive?

The structure is 134 ft (40.8 m) long with a longest span of 60 ft (18.3 m) and a deck 63 ft wide.

Who owns U.S. Highway 101 over Westhaven Drive?

It is owned by the State Highway Agency.