US Bridges

Nfa A364 over Spring Branch

FairPosted for load

Montgomery County, Tennessee · 2 M. E. Cunningham. · Structure no. 630A3640003

Built
1950
75 years old, rebuilt 1985
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
50 ft
3 main spans
Daily traffic
640
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A364 over Spring Branch is a steel stringer/multi-beam or girder carrying Nfa A364 over Spring Branch in Montgomery County, Tennessee. It was built in 1950 and reconstructed in 1985, so it is 75 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 6 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 640 vehicles a day, roughly 2% of them trucks, projected to reach 1,024 by 2042. The structure is 50 ft (15.2 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesNfa A364
CrossesSpring Branch
Location2 M. E. Cunningham.
RouteCounty Highway 364
CountyMontgomery County
StateTennessee
Coordinates36.40418, -87.34665
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating13.6 US tons
Inventory rating10.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length50 ft (15.2 m)
Longest span30 ft (9.1 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic640 (2020)
Projected traffic1,024 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$124,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A364 over Spring Branch built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1985.

What condition is Nfa A364 over Spring Branch 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 October 2024.

How much traffic does Nfa A364 over Spring Branch carry?

About 640 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A364 over Spring Branch?

The structure is 50 ft (15.2 m) long with a longest span of 30 ft (9.1 m) and a deck 27 ft wide.

Who owns Nfa A364 over Spring Branch?

It is owned by the County Highway Agency.