US Bridges

State Route 3 over Swift Creek

Good

Trinity County, California · 02-TRI-003-R60.01 · Structure no. 05 0095

Built
2022
3 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
200 ft
2 main spans
Daily traffic
645
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 3 over Swift Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying State Route 3 over Swift Creek in Trinity County, California. It was built in 2022, so it is 3 years old, younger 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 645 vehicles a day, roughly 11% of them trucks, projected to reach 714 by 2046. The structure is 200 ft (61 m) long and 44 ft wide. If it were closed, the detour would be 36 mi (58 km).

CarriesState Route 3
CrossesSwift Creek
Location02-TRI-003-R60.01
RouteState Highway 3
Coordinates40.98569, -122.70775
Functional classRural Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadGreater than HL 93
Structure length200 ft (61 m)
Longest span97 ft (29.6 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic645 (2009)
Projected traffic714 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36 mi (58 km)
TollOn a free road
National Highway SystemNo

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 3 over Swift Creek built?

It was built in 2022, making it 3 years old in 2025.

What condition is State Route 3 over Swift 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 August 2024.

How much traffic does State Route 3 over Swift Creek carry?

About 645 vehicles per day (2009 count), of which roughly 11% are trucks.

How long is State Route 3 over Swift Creek?

The structure is 200 ft (61 m) long with a longest span of 97 ft (29.6 m) and a deck 44 ft wide.

Who owns State Route 3 over Swift Creek?

It is owned by the State Highway Agency.