US Bridges

Nfa 1320 (sa 3212) over Spring Branch

Fair

Hamblen County, Tennessee · 1.5 Mi. Northwest of SR32 · Structure no. 32S24880003

Built
1987
38 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
35 ft
2 main spans
Daily traffic
4,350
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1320 (sa 3212) over Spring Branch is a concrete continuous culvert carrying Nfa 1320 (sa 3212) over Spring Branch in Hamblen County, Tennessee. It was built in 1987, so it is 38 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 4,350 vehicles a day, roughly 3% of them trucks, projected to reach 6,640 by 2039. The structure is 35 ft (10.7 m) long and 33 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesNfa 1320 (sa 3212)
CrossesSpring Branch
Location1.5 Mi. Northwest of SR32
RouteCounty Highway 1320
CountyHamblen County
StateTennessee
Coordinates36.23252, -83.31303
Functional classUrban 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span12 ft (3.7 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,350 (2021)
Projected traffic6,640 by 2039
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$140,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1320 (sa 3212) over Spring Branch built?

It was built in 1987, making it 38 years old in 2025.

What condition is Nfa 1320 (sa 3212) over Spring 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 September 2023.

How much traffic does Nfa 1320 (sa 3212) over Spring Branch carry?

About 4,350 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1320 (sa 3212) over Spring Branch?

The structure is 35 ft (10.7 m) long with a longest span of 12 ft (3.7 m) and a deck 33 ft wide.

Who owns Nfa 1320 (sa 3212) over Spring Branch?

It is owned by the County Highway Agency.