US Bridges

Nfa 973 (sa 6312) over Cumberland River

Fair

Montgomery County, Tennessee · 5.5 M. N. Cunningham. · Structure no. 63S63630003

Built
1987
38 years old
Condition
Fair
inspected November 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
1,120 ft
6 main spans
Daily traffic
11,605
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 973 (sa 6312) over Cumberland River is a steel continuous girder and floorbeam system carrying Nfa 973 (sa 6312) over Cumberland River in Montgomery County, Tennessee. It was built in 1987, so it is 38 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 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 11,605 vehicles a day, roughly 3% of them trucks, projected to reach 18,894 by 2042. The structure is 1,120 ft (341.4 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 973 (sa 6312)
CrossesCumberland River
Location5.5 M. N. Cunningham.
RouteCounty Highway 973
CountyMontgomery County
StateTennessee
Coordinates36.50308, -87.38073
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating85.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length1,120 ft (341.4 m)
Longest span282 ft (86.1 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,605 (2021)
Projected traffic18,894 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$17.8 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Nfa 973 (sa 6312) over Cumberland River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Nfa 973 (sa 6312) over Cumberland 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 November 2024.

How much traffic does Nfa 973 (sa 6312) over Cumberland River carry?

About 11,605 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 973 (sa 6312) over Cumberland River?

The structure is 1,120 ft (341.4 m) long with a longest span of 282 ft (86.1 m) and a deck 32 ft wide.

Who owns Nfa 973 (sa 6312) over Cumberland River?

It is owned by the County Highway Agency.