US Bridges

Dinsmore Drive over Rohner Creek

Good

Humboldt County, California · 0.3 MI N Int Wth 12th ST · Structure no. 04C0102

Built
1962
63 years old
Condition
Good
inspected August 2022
Type
Slab
Concrete Continuous
Length
87 ft
3 main spans
Daily traffic
556
2011 count
Owner
City
City or Municipal Highway Agency

About this bridge

Dinsmore Drive over Rohner Creek is a concrete continuous slab carrying Dinsmore Drive over Rohner Creek in Humboldt County, California. It was built in 1962, so it is 63 years old, older 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 556 vehicles a day, roughly 2% of them trucks, projected to reach 330 by 2044. The structure is 87 ft (26.5 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesDinsmore Drive
CrossesRohner Creek
Location0.3 MI N Int Wth 12th ST
RouteCity Street 0
Coordinates40.59007, -124.15706
Functional classUrban Local

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating78.3 US tons
Inventory rating47.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length87 ft (26.5 m)
Longest span28 ft (8.5 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic556 (2011)
Projected traffic330 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Dinsmore Drive over Rohner Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is Dinsmore Drive over Rohner Creek 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 August 2022.

How much traffic does Dinsmore Drive over Rohner Creek carry?

About 556 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Dinsmore Drive over Rohner Creek?

The structure is 87 ft (26.5 m) long with a longest span of 28 ft (8.5 m) and a deck 29 ft wide.

Who owns Dinsmore Drive over Rohner Creek?

It is owned by the City or Municipal Highway Agency.