US Bridges

Nfa 1251 (sa 5330) over I75

FairPosted for load

Loudon County, Tennessee · 3 M. N. Loudon. · Structure no. 53I00750021

Built
1972
53 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
340 ft
3 main spans
Daily traffic
1,151
2021 count
Owner
State
State Highway Agency

About this bridge

Nfa 1251 (sa 5330) over I75 is a prestressed concrete box beam or girders - single or spread carrying Nfa 1251 (sa 5330) over I75 in Loudon County, Tennessee. It was built in 1972, so it is 53 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. Its operating status is: posted for load restriction.

It carries about 1,151 vehicles a day, roughly 3% of them trucks, projected to reach 1,842 by 2042. The structure is 340 ft (103.6 m) long and 46 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesNfa 1251 (sa 5330)
CrossesI75
Location3 M. N. Loudon.
RouteCounty Highway 1251
CountyLoudon County
StateTennessee
Coordinates35.78367, -84.34448
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.4 US tons
Inventory rating17.9 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length340 ft (103.6 m)
Longest span120 ft (36.6 m)
Deck width46 ft (14 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,151 (2021)
Projected traffic1,842 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.9 mi (24 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa 1251 (sa 5330) over I75 built?

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

What condition is Nfa 1251 (sa 5330) over I75 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 1251 (sa 5330) over I75 carry?

About 1,151 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1251 (sa 5330) over I75?

The structure is 340 ft (103.6 m) long with a longest span of 120 ft (36.6 m) and a deck 46 ft wide.

Who owns Nfa 1251 (sa 5330) over I75?

It is owned by the State Highway Agency.