US Bridges

Nfa A400 over Obed River

Fair

Cumberland County, Tennessee · In City of Crossville · Structure no. 180A4000001

Built
1926
99 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
33 ft
1 main span
Daily traffic
1,890
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa A400 over Obed River is a concrete tee beam carrying Nfa A400 over Obed River in Cumberland County, Tennessee. It was built in 1926, so it is 99 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 1,890 vehicles a day, roughly 2% of them trucks, projected to reach 3,024 by 2042. The structure is 33 ft (10.2 m) long and 23 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNfa A400
CrossesObed River
LocationIn City of Crossville
RouteCity Street 400
CountyCumberland County
StateTennessee
Coordinates35.95751, -85.0503
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length33 ft (10.2 m)
Longest span32 ft (9.7 m)
Deck width23 ft (7.1 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,890 (2020)
Projected traffic3,024 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$176,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A400 over Obed River built?

It was built in 1926, making it 99 years old in 2025.

What condition is Nfa A400 over Obed River 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 May 2024.

How much traffic does Nfa A400 over Obed River carry?

About 1,890 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A400 over Obed River?

The structure is 33 ft (10.2 m) long with a longest span of 32 ft (9.7 m) and a deck 23 ft wide.

Who owns Nfa A400 over Obed River?

It is owned by the City or Municipal Highway Agency.