US Bridges

Swift Creek Road over North Fork Swift Creek

Fair

Trinity County, California · 1.0 MI W of State RTE 3 · Structure no. 05C0220

Built
1972
53 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
80 ft
1 main span
Daily traffic
75
1986 count
Owner
County
County Highway Agency

About this bridge

Swift Creek Road over North Fork Swift Creek is a prestressed concrete stringer/multi-beam or girder carrying Swift Creek Road over North Fork Swift Creek in Trinity County, California. It was built in 1972, so it is 53 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 75 vehicles a day, projected to reach 97 by 2042. The structure is 80 ft (24.5 m) long and 15 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesSwift Creek Road
CrossesNorth Fork Swift Creek
Location1.0 MI W of State RTE 3
RouteCounty Highway 0
CountyTrinity County
StateCalifornia
Coordinates40.98197, -122.72602
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating34.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length80 ft (24.5 m)
Longest span76 ft (23.2 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (1986)
Projected traffic97 by 2042
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Swift Creek Road over North Fork Swift Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is Swift Creek Road over North Fork Swift 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 May 2024.

How much traffic does Swift Creek Road over North Fork Swift Creek carry?

About 75 vehicles per day (1986 count).

How long is Swift Creek Road over North Fork Swift Creek?

The structure is 80 ft (24.5 m) long with a longest span of 76 ft (23.2 m) and a deck 15 ft wide.

Who owns Swift Creek Road over North Fork Swift Creek?

It is owned by the County Highway Agency.