US Bridges

State Route 299 over Pony Bar Creek

Good

Trinity County, California · 02-TRI-299-5.94 · Structure no. 05 0043

Built
1966
59 years old, rebuilt 1990
Condition
Good
inspected January 2025
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
168 ft
2 main spans
Daily traffic
3,080
2010 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Pony Bar Creek is a concrete continuous box beam or girders - multiple carrying State Route 299 over Pony Bar Creek in Trinity County, California. It was built in 1966 and reconstructed in 1990, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,080 vehicles a day, roughly 15% of them trucks, projected to reach 5,315 by 2047. The structure is 168 ft (51.2 m) long and 35 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesState Route 299
CrossesPony Bar Creek
Location02-TRI-299-5.94
RouteState Highway 299
Coordinates40.86454, -123.51648
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating78.9 US tons
Inventory rating47.5 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length168 ft (51.2 m)
Longest span82 ft (25.1 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,080 (2010)
Projected traffic5,315 by 2047
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Pony Bar Creek built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1990.

What condition is State Route 299 over Pony Bar Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does State Route 299 over Pony Bar Creek carry?

About 3,080 vehicles per day (2010 count), of which roughly 15% are trucks.

How long is State Route 299 over Pony Bar Creek?

The structure is 168 ft (51.2 m) long with a longest span of 82 ft (25.1 m) and a deck 35 ft wide.

Who owns State Route 299 over Pony Bar Creek?

It is owned by the State Highway Agency.