US Bridges

Nfa 900 (sa 4008) over Overflow

Fair

Henry County, Tennessee · 4 Mi. W. of Benton Co. · Structure no. 40F00040009

Built
1950
75 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
32 ft
2 main spans
Daily traffic
441
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 900 (sa 4008) over Overflow is a concrete continuous culvert carrying Nfa 900 (sa 4008) over Overflow in Henry County, Tennessee. It was built in 1950, so it is 75 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 5 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 441 vehicles a day, roughly 4% of them trucks, projected to reach 706 by 2042. The structure is 32 ft (9.8 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 900 (sa 4008)
CrossesOverflow
Location4 Mi. W. of Benton Co.
RouteCounty Highway 5741
CountyHenry County
StateTennessee
Coordinates36.21244, -88.23991
Functional classRural Major 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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length32 ft (9.8 m)
Longest span7 ft (2.1 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic441 (2021)
Projected traffic706 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$245,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 900 (sa 4008) over Overflow built?

It was built in 1950, making it 75 years old in 2025.

What condition is Nfa 900 (sa 4008) over Overflow 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 900 (sa 4008) over Overflow carry?

About 441 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Nfa 900 (sa 4008) over Overflow?

The structure is 32 ft (9.8 m) long with a longest span of 7 ft (2.1 m) and a deck 29 ft wide.

Who owns Nfa 900 (sa 4008) over Overflow?

It is owned by the County Highway Agency.