US Bridges

Nfa 820 over Overflow

Good

Lauderdale County, Tennessee · .4 Mi. W. of SR88 · Structure no. 49SR0880001

Built
1986
39 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete Continuous
Length
43 ft
4 main spans
Daily traffic
1,019
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 820 over Overflow is a concrete continuous culvert carrying Nfa 820 over Overflow in Lauderdale County, Tennessee. It was built in 1986, so it is 39 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,019 vehicles a day, roughly 5% of them trucks, projected to reach 8 by 2042. The structure is 43 ft (13.1 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesNfa 820
CrossesOverflow
Location.4 Mi. W. of SR88
RouteCounty Highway 820
Coordinates35.91511, -89.631
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span10 ft (3 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,019 (2021)
Projected traffic8 by 2042
Trucks5%
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 820 over Overflow built?

It was built in 1986, making it 39 years old in 2025.

What condition is Nfa 820 over Overflow in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Nfa 820 over Overflow carry?

About 1,019 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Nfa 820 over Overflow?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m) and a deck 34 ft wide.

Who owns Nfa 820 over Overflow?

It is owned by the County Highway Agency.