US Bridges

FAS 129 over Trigg Branch

FairPosted for load

Giles County, Tennessee · 3 MI NE JCT ST7 · Structure no. 28SR1290005

Built
1920
105 years old, rebuilt 1954
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
23 ft
1 main span
Daily traffic
1,286
2021 count
Owner
State
State Highway Agency

About this bridge

FAS 129 over Trigg Branch is a steel stringer/multi-beam or girder carrying FAS 129 over Trigg Branch in Giles County, Tennessee. It was built in 1920 and reconstructed in 1954, so it is 105 years old, older than the Tennessee average of 47.4 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. Its operating status is: posted for load restriction.

It carries about 1,286 vehicles a day, roughly 5% of them trucks, projected to reach 2,058 by 2042. The structure is 23 ft (7.1 m) long and 34 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesFAS 129
CrossesTrigg Branch
Location3 MI NE JCT ST7
RouteState Highway 129
CountyGiles County
StateTennessee
Coordinates35.37951, -86.98092
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length23 ft (7.1 m)
Longest span20 ft (6.1 m)
Deck width34 ft (10.5 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,286 (2021)
Projected traffic2,058 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$49,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAS 129 over Trigg Branch built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1954.

What condition is FAS 129 over Trigg Branch 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 January 2024.

How much traffic does FAS 129 over Trigg Branch carry?

About 1,286 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is FAS 129 over Trigg Branch?

The structure is 23 ft (7.1 m) long with a longest span of 20 ft (6.1 m) and a deck 34 ft wide.

Who owns FAS 129 over Trigg Branch?

It is owned by the State Highway Agency.