US Bridges

Nfa 975 (sa 6308) over Dry Branch

Good

Montgomery County, Tennessee · 4 MI N Palmyra · Structure no. 63S62690003

Built
1986
39 years old
Condition
Good
inspected November 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
49 ft
1 main span
Daily traffic
636
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 975 (sa 6308) over Dry Branch is a prestressed concrete box beam or girders - single or spread carrying Nfa 975 (sa 6308) over Dry Branch in Montgomery 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 636 vehicles a day, roughly 3% of them trucks, projected to reach 800 by 2038. The structure is 49 ft (14.9 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNfa 975 (sa 6308)
CrossesDry Branch
Location4 MI N Palmyra
RouteCounty Highway 975
Coordinates36.49866, -87.5018
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span47 ft (14.3 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic636 (2021)
Projected traffic800 by 2038
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 975 (sa 6308) over Dry Branch built?

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

What condition is Nfa 975 (sa 6308) over Dry Branch 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 2024.

How much traffic does Nfa 975 (sa 6308) over Dry Branch carry?

About 636 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 975 (sa 6308) over Dry Branch?

The structure is 49 ft (14.9 m) long with a longest span of 47 ft (14.3 m) and a deck 28 ft wide.

Who owns Nfa 975 (sa 6308) over Dry Branch?

It is owned by the County Highway Agency.