US Bridges

Nfa 2138 (sa 8920) over Collins River

FairPosted for load

Warren County, Tennessee · 1.4MI East of SR56 · Structure no. 89021380001

Built
1938
87 years old, rebuilt 1987
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
421 ft
4 main spans
Daily traffic
570
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 2138 (sa 8920) over Collins River is a steel continuous stringer/multi-beam or girder carrying Nfa 2138 (sa 8920) over Collins River in Warren County, Tennessee. It was built in 1938 and reconstructed in 1987, so it is 87 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 570 vehicles a day, roughly 3% of them trucks, projected to reach 912 by 2042. The structure is 421 ft (128.4 m) long and 31 ft wide. If it were closed, the detour would be 10.6 mi (17 km).

CarriesNfa 2138 (sa 8920)
CrossesCollins River
Location1.4MI East of SR56
RouteCounty Highway 2138
Coordinates35.58139, -85.70084
Functional classRural Minor 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
Deck7 GoodSome minor problems.
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 protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating22.2 US tons

Structure

MaterialSteel Continuous
DeckConcrete, precast panels
Main spans4 (+3 approach)
Design loadHS 20
Structure length421 ft (128.4 m)
Longest span75 ft (22.9 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic570 (2021)
Projected traffic912 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed10.6 mi (17 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 2138 (sa 8920) over Collins River built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1987.

What condition is Nfa 2138 (sa 8920) over Collins River 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 April 2023.

How much traffic does Nfa 2138 (sa 8920) over Collins River carry?

About 570 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 2138 (sa 8920) over Collins River?

The structure is 421 ft (128.4 m) long with a longest span of 75 ft (22.9 m) and a deck 31 ft wide.

Who owns Nfa 2138 (sa 8920) over Collins River?

It is owned by the County Highway Agency.