US Bridges

State Route 299 over Redwood Creek

Fair

Humboldt County, California · 01-HUM-299-R22.33 · Structure no. 04 0042

Built
1965
60 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
674 ft
5 main spans
Daily traffic
3,200
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Redwood Creek is a steel stringer/multi-beam or girder carrying State Route 299 over Redwood Creek in Humboldt County, California. It was built in 1965, so it is 60 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 3,200 vehicles a day, projected to reach 4,693 by 2043. The structure is 674 ft (205.4 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesState Route 299
CrossesRedwood Creek
Location01-HUM-299-R22.33
RouteState Highway 299
CountyHumboldt County
StateCalifornia
Coordinates40.90338, -123.81029
Functional classRural Principal Arterial - Other

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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length674 ft (205.4 m)
Longest span134 ft (40.8 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2009)
Projected traffic4,693 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 299 over Redwood Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is State Route 299 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 January 2025.

How much traffic does State Route 299 over Redwood Creek carry?

About 3,200 vehicles per day (2009 count).

How long is State Route 299 over Redwood Creek?

The structure is 674 ft (205.4 m) long with a longest span of 134 ft (40.8 m) and a deck 34 ft wide.

Who owns State Route 299 over Redwood Creek?

It is owned by the State Highway Agency.