US Bridges

Rohnerville Road over Strongs Creek

Fair

Humboldt County, California · 0.3 MI W of Newburg RD · Structure no. 04C0211

Built
1915
110 years old, rebuilt 1979
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete
Length
42 ft
1 main span
Daily traffic
4,924
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Rohnerville Road over Strongs Creek is a concrete tee beam carrying Rohnerville Road over Strongs Creek in Humboldt County, California. It was built in 1915 and reconstructed in 1979, so it is 110 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 6 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 4,924 vehicles a day, roughly 5% of them trucks, projected to reach 6,101 by 2042. The structure is 42 ft (12.8 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRohnerville Road
CrossesStrongs Creek
Location0.3 MI W of Newburg RD
RouteCity Street 0
CountyHumboldt County
StateCalifornia
Coordinates40.58971, -124.13461
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating24.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length42 ft (12.8 m)
Longest span39 ft (12 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,924 (2015)
Projected traffic6,101 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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 Rohnerville Road over Strongs Creek built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 1979.

What condition is Rohnerville Road 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 Rohnerville Road over Strongs Creek carry?

About 4,924 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Rohnerville Road over Strongs Creek?

The structure is 42 ft (12.8 m) long with a longest span of 39 ft (12 m) and a deck 33 ft wide.

Who owns Rohnerville Road over Strongs Creek?

It is owned by the City or Municipal Highway Agency.