US Bridges

Briceland-Thorne over Redwood Creek

Fair

Humboldt County, California · 3.3 MI W JCT US 101 · Structure no. 04C0001

Built
1938
87 years old, rebuilt 1959
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete
Length
99 ft
2 main spans
Daily traffic
1,836
2008 count
Owner
County
County Highway Agency

About this bridge

Briceland-Thorne over Redwood Creek is a concrete tee beam carrying Briceland-Thorne over Redwood Creek in Humboldt County, California. It was built in 1938 and reconstructed in 1959, so it is 87 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 99 ft (30.2 m) long and 22 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesBriceland-Thorne
CrossesRedwood Creek
Location3.3 MI W JCT US 101
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.12615, -123.86833
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.5 US tons
Inventory rating16.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length99 ft (30.2 m)
Longest span56 ft (17.1 m)
Deck width22 ft (6.6 m)
Roadway width21 ft (6.4 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 closed123.7 mi (199 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 1938, making it 87 years old in 2025. It was reconstructed in 1959.

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 99 ft (30.2 m) long with a longest span of 56 ft (17.1 m) and a deck 22 ft wide.

Who owns Briceland-Thorne over Redwood Creek?

It is owned by the County Highway Agency.