US Bridges

Nfa A185 over Sequatchie River

Fair

Marion County, Tennessee · 5.4 MI NE JCT SR27&SR283 · Structure no. 580A1850001

Built
1985
40 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
253 ft
3 main spans
Daily traffic
240
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A185 over Sequatchie River is a prestressed concrete continuous box beam or girders - single or spread carrying Nfa A185 over Sequatchie River in Marion County, Tennessee. It was built in 1985, so it is 40 years old, younger 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 6 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 240 vehicles a day, roughly 2% of them trucks, projected to reach 384 by 2040. The structure is 253 ft (77.1 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNfa A185
CrossesSequatchie River
Location5.4 MI NE JCT SR27&SR283
RouteCounty Highway 185
CountyMarion County
StateTennessee
Coordinates35.26483, -85.45997
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment6: Equal to present minimum criteria
Operating rating63.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length253 ft (77.1 m)
Longest span85 ft (25.8 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic240 (2020)
Projected traffic384 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 A185 over Sequatchie River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Nfa A185 over Sequatchie 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 October 2024.

How much traffic does Nfa A185 over Sequatchie River carry?

About 240 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A185 over Sequatchie River?

The structure is 253 ft (77.1 m) long with a longest span of 85 ft (25.8 m) and a deck 24 ft wide.

Who owns Nfa A185 over Sequatchie River?

It is owned by the County Highway Agency.