US Bridges

Nfa A284 over Sango Rd-Srt. 15B / I24

Fair

Montgomery County, Tennessee · 11 M. Ne. Southside. · Structure no. 63I00240024

Built
1973
52 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
230 ft
3 main spans
Daily traffic
140
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A284 over Sango Rd-Srt. 15B / I24 is a concrete continuous box beam or girders - multiple carrying Nfa A284 over Sango Rd-Srt. 15B / I24 in Montgomery County, Tennessee. It was built in 1973, so it is 52 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 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 140 vehicles a day, roughly 2% of them trucks, projected to reach 224 by 2041. The structure is 230 ft (70.1 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNfa A284
CrossesSango Rd-Srt. 15B / I24
Location11 M. Ne. Southside.
RouteCounty Highway 284
CountyMontgomery County
StateTennessee
Coordinates36.47695, -87.14222
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.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating28.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length230 ft (70.1 m)
Longest span121 ft (36.9 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2020)
Projected traffic224 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa A284 over Sango Rd-Srt. 15B / I24 built?

It was built in 1973, making it 52 years old in 2025.

What condition is Nfa A284 over Sango Rd-Srt. 15B / I24 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 September 2024.

How much traffic does Nfa A284 over Sango Rd-Srt. 15B / I24 carry?

About 140 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A284 over Sango Rd-Srt. 15B / I24?

The structure is 230 ft (70.1 m) long with a longest span of 121 ft (36.9 m) and a deck 32 ft wide.

Who owns Nfa A284 over Sango Rd-Srt. 15B / I24?

It is owned by the State Highway Agency.