US Bridges

Sunset Ave over US Highway 101

Good

Humboldt County, California · 01-HUM-101-86.94-ARC · Structure no. 04 0244

Built
1976
49 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
259 ft
2 main spans
Daily traffic
6,378
2010 count
Owner
State
State Highway Agency

About this bridge

Sunset Ave over US Highway 101 is a prestressed concrete continuous box beam or girders - multiple carrying Sunset Ave over US Highway 101 in Humboldt County, California. It was built in 1976, so it is 49 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 6,378 vehicles a day, roughly 5% of them trucks, projected to reach 12,868 by 2041. The structure is 259 ft (78.9 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSunset Ave
CrossesUS Highway 101
Location01-HUM-101-86.94-ARC
RouteCity Street 0
Coordinates40.87867, -124.0827
Functional classUrban Other Principal Arterial

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.
Last inspectionSeptember 2023
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 alignment6: Equal to present minimum criteria
Operating rating65.7 US tons
Inventory rating41.4 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length259 ft (78.9 m)
Longest span152 ft (46.3 m)
Deck width68 ft (20.7 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,378 (2010)
Projected traffic12,868 by 2041
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Sunset Ave over US Highway 101 built?

It was built in 1976, making it 49 years old in 2025.

What condition is Sunset Ave over US Highway 101 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 September 2023.

How much traffic does Sunset Ave over US Highway 101 carry?

About 6,378 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is Sunset Ave over US Highway 101?

The structure is 259 ft (78.9 m) long with a longest span of 152 ft (46.3 m) and a deck 68 ft wide.

Who owns Sunset Ave over US Highway 101?

It is owned by the State Highway Agency.