US Bridges

State Route 299 over Canyon Creek

Fair

Trinity County, California · 02-TRI-299-43.36 · Structure no. 05 0012

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
212 ft
4 main spans
Daily traffic
3,325
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Canyon Creek is a concrete continuous box beam or girders - multiple carrying State Route 299 over Canyon Creek in Trinity County, California. It was built in 1966, so it is 59 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 3,325 vehicles a day, projected to reach 4,073 by 2045. The structure is 212 ft (64.6 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesState Route 299
CrossesCanyon Creek
Location02-TRI-299-43.36
RouteState Highway 299
CountyTrinity County
StateCalifornia
Coordinates40.73192, -123.05439
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 protection9 ExcellentNo problems noted.
Last inspectionMarch 2023
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 alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating34.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length212 ft (64.6 m)
Longest span60 ft (18.3 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,325 (2009)
Projected traffic4,073 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Canyon Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is State Route 299 over Canyon 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 March 2023.

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

About 3,325 vehicles per day (2009 count).

How long is State Route 299 over Canyon Creek?

The structure is 212 ft (64.6 m) long with a longest span of 60 ft (18.3 m) and a deck 34 ft wide.

Who owns State Route 299 over Canyon Creek?

It is owned by the State Highway Agency.