US Bridges

Main Street over Rohner Creek

Fair

Humboldt County, California · Just East of 16th Street · Structure no. 04C0103

Built
1922
103 years old, rebuilt 1948
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete
Length
26 ft
1 main span
Daily traffic
11,181
2014 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main Street over Rohner Creek is a concrete tee beam carrying Main Street over Rohner Creek in Humboldt County, California. It was built in 1922 and reconstructed in 1948, so it is 103 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 11,181 vehicles a day, roughly 5% of them trucks, projected to reach 11,184 by 2041. The structure is 26 ft (8 m) long and 74 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesMain Street
CrossesRohner Creek
LocationJust East of 16th Street
RouteCity Street 0
Coordinates40.59779, -124.15011
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: 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 rating30.8 US tons
Inventory rating18.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (8 m)
Longest span25 ft (7.7 m)
Deck width74 ft (22.7 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,181 (2014)
Projected traffic11,184 by 2041
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed2.5 mi (4 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 Main Street over Rohner Creek built?

It was built in 1922, making it 103 years old in 2025. It was reconstructed in 1948.

What condition is Main Street over Rohner 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 Main Street over Rohner Creek carry?

About 11,181 vehicles per day (2014 count), of which roughly 5% are trucks.

How long is Main Street over Rohner Creek?

The structure is 26 ft (8 m) long with a longest span of 25 ft (7.7 m) and a deck 74 ft wide.

Who owns Main Street over Rohner Creek?

It is owned by the City or Municipal Highway Agency.