US Bridges

Nfa 1538 (sa 6620) over Overflow

FairPosted for load

Obion County, Tennessee · 2.7 MI SW JCT SR43&SR215 · Structure no. 66015380003

Built
1957
68 years old
Condition
Fair
inspected March 2023
Type
Channel Beam
Concrete
Length
58 ft
3 main spans
Daily traffic
321
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1538 (sa 6620) over Overflow is a concrete channel beam carrying Nfa 1538 (sa 6620) over Overflow in Obion County, Tennessee. It was built in 1957, so it is 68 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. Its operating status is: posted for load restriction.

It carries about 321 vehicles a day, roughly 3% of them trucks, projected to reach 514 by 2042. The structure is 58 ft (17.7 m) long and 25 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 1538 (sa 6620)
CrossesOverflow
Location2.7 MI SW JCT SR43&SR215
RouteCounty Highway 1538
CountyObion County
StateTennessee
Coordinates36.46836, -88.91286
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating47.5 US tons
Inventory rating28.9 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length58 ft (17.7 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic321 (2021)
Projected traffic514 by 2042
Trucks3%
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$395,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1538 (sa 6620) over Overflow built?

It was built in 1957, making it 68 years old in 2025.

What condition is Nfa 1538 (sa 6620) 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 March 2023.

How much traffic does Nfa 1538 (sa 6620) over Overflow carry?

About 321 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1538 (sa 6620) over Overflow?

The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns Nfa 1538 (sa 6620) over Overflow?

It is owned by the County Highway Agency.