US Bridges

State Route 299 over Indian Creek

Fair

Trinity County, California · 02-TRI-299-59.68 · Structure no. 05 0019

Built
1974
51 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
135 ft
3 main spans
Daily traffic
4,050
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Indian Creek is a concrete continuous tee beam carrying State Route 299 over Indian Creek in Trinity County, California. It was built in 1974, so it is 51 years old, younger 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 4,050 vehicles a day, roughly 11% of them trucks, projected to reach 5,498 by 2040. The structure is 135 ft (41.1 m) long and 43 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesState Route 299
CrossesIndian Creek
Location02-TRI-299-59.68
RouteState Highway 299
Coordinates40.65685, -122.91393
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating49.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length135 ft (41.1 m)
Longest span49 ft (14.9 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,050 (2009)
Projected traffic5,498 by 2040
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Indian Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is State Route 299 over Indian 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 Indian Creek carry?

About 4,050 vehicles per day (2009 count), of which roughly 11% are trucks.

How long is State Route 299 over Indian Creek?

The structure is 135 ft (41.1 m) long with a longest span of 49 ft (14.9 m) and a deck 43 ft wide.

Who owns State Route 299 over Indian Creek?

It is owned by the State Highway Agency.