US Bridges

Briceland-Thorne over Redwood Creek

Fair

Humboldt County, California · 2.3 MI W/O Redwood DR · Structure no. 04C0002

Built
1959
66 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
87 ft
1 main span
Daily traffic
1,836
2008 count
Owner
County
County Highway Agency

About this bridge

Briceland-Thorne over Redwood Creek is a steel stringer/multi-beam or girder carrying Briceland-Thorne over Redwood Creek in Humboldt County, California. It was built in 1959, so it is 66 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 1,836 vehicles a day, roughly 14% of them trucks, projected to reach 2,180 by 2045. The structure is 87 ft (26.5 m) long and 29 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

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CarriesBriceland-Thorne
CrossesRedwood Creek
Location2.3 MI W/O Redwood DR
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.12736, -123.85272
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating61.4 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span85 ft (25.9 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,836 (2008)
Projected traffic2,180 by 2045
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Briceland-Thorne over Redwood Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Briceland-Thorne over Redwood 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 July 2023.

How much traffic does Briceland-Thorne over Redwood Creek carry?

About 1,836 vehicles per day (2008 count), of which roughly 14% are trucks.

How long is Briceland-Thorne over Redwood Creek?

The structure is 87 ft (26.5 m) long with a longest span of 85 ft (25.9 m) and a deck 29 ft wide.

Who owns Briceland-Thorne over Redwood Creek?

It is owned by the County Highway Agency.