US Bridges

Nfa A100 over Fall Creek

Fair

Union County, Tennessee · N of SR170-W of SR33 JCT · Structure no. 870A1000003

Built
1984
41 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
40
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A100 over Fall Creek is a concrete continuous culvert carrying Nfa A100 over Fall Creek in Union County, Tennessee. It was built in 1984, so it is 41 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 40 vehicles a day, roughly 2% of them trucks, projected to reach 64 by 2040. The structure is 31 ft (9.5 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNfa A100
CrossesFall Creek
LocationN of SR170-W of SR33 JCT
RouteCounty Highway 100
CountyUnion County
StateTennessee
Coordinates36.2419, -83.80103
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42.5 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length31 ft (9.5 m)
Longest span14 ft (4.3 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2020)
Projected traffic64 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 A100 over Fall Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nfa A100 over Fall Creek 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 July 2024.

How much traffic does Nfa A100 over Fall Creek carry?

About 40 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A100 over Fall Creek?

The structure is 31 ft (9.5 m) long with a longest span of 14 ft (4.3 m) and a deck 33 ft wide.

Who owns Nfa A100 over Fall Creek?

It is owned by the County Highway Agency.