US Bridges

Fortuna Boulevard over Strongs Creek

Fair

Humboldt County, California · 0.2 MI N/O Kenmar RD · Structure no. 04C0100

Built
1949
76 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete
Length
30 ft
1 main span
Daily traffic
11,988
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Fortuna Boulevard over Strongs Creek is a concrete culvert carrying Fortuna Boulevard over Strongs Creek in Humboldt County, California. It was built in 1949, so it is 76 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 11,988 vehicles a day, roughly 5% of them trucks, projected to reach 15,405 by 2042. The structure is 30 ft (9 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFortuna Boulevard
CrossesStrongs Creek
Location0.2 MI N/O Kenmar RD
RouteCity Street 0
CountyHumboldt County
StateCalifornia
Coordinates40.5803, -124.14666
Functional classUrban Other Principal 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
Channel and channel protection9 ExcellentNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: 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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length30 ft (9 m)
Longest span28 ft (8.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,988 (2015)
Projected traffic15,405 by 2042
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Fortuna Boulevard over Strongs Creek built?

It was built in 1949, making it 76 years old in 2025.

What condition is Fortuna Boulevard over Strongs Creek 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 August 2024.

How much traffic does Fortuna Boulevard over Strongs Creek carry?

About 11,988 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Fortuna Boulevard over Strongs Creek?

The structure is 30 ft (9 m) long with a longest span of 28 ft (8.5 m).

Who owns Fortuna Boulevard over Strongs Creek?

It is owned by the City or Municipal Highway Agency.