US Bridges

Nfa E359 over Mackey Branch

FairPosted for load

Hamilton County, Tennessee · 2 MI East of I75 · Structure no. 330E3590001

Built
1981
44 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
5,889
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa E359 over Mackey Branch is a steel stringer/multi-beam or girder carrying Nfa E359 over Mackey Branch in Hamilton County, Tennessee. It was built in 1981, so it is 44 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 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 5,889 vehicles a day, roughly 4% of them trucks, projected to reach 9,422 by 2042. The structure is 32 ft (9.8 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNfa E359
CrossesMackey Branch
Location2 MI East of I75
RouteCity Street 359
CountyHamilton County
StateTennessee
Coordinates35.0118, -85.14951
Functional classUrban Minor Arterial

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 inspectionMarch 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating14.7 US tons
Inventory rating11.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 10
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width36 ft (11.1 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,889 (2021)
Projected traffic9,422 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$140,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa E359 over Mackey Branch built?

It was built in 1981, making it 44 years old in 2025.

What condition is Nfa E359 over Mackey 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 March 2024.

How much traffic does Nfa E359 over Mackey Branch carry?

About 5,889 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Nfa E359 over Mackey Branch?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 36 ft wide.

Who owns Nfa E359 over Mackey Branch?

It is owned by the City or Municipal Highway Agency.