US Bridges

Nfa E260 over Mackey Branch

PoorPosted for load

Hamilton County, Tennessee · 2 MI South of I75 · Structure no. 330E2600001

Built
1973
52 years old
Condition
Poor
inspected February 2024
Type
Culvert
Steel
Length
28 ft
3 main spans
Daily traffic
810
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa E260 over Mackey Branch is a steel culvert carrying Nfa E260 over Mackey Branch in Hamilton County, Tennessee. It was built in 1973, so it is 52 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 810 vehicles a day, roughly 2% of them trucks, projected to reach 1,296 by 2042. The structure is 28 ft (8.6 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNfa E260
CrossesMackey Branch
Location2 MI South of I75
RouteCounty Highway 260
CountyHamilton County
StateTennessee
Coordinates35.0422, -85.12164
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: 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 rating21.8 US tons
Inventory rating16.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckCorrugated steel
Main spans3
Design loadH 15
Structure length28 ft (8.6 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic810 (2020)
Projected traffic1,296 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$761,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa E260 over Mackey Branch built?

It was built in 1973, making it 52 years old in 2025.

What condition is Nfa E260 over Mackey Branch in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does Nfa E260 over Mackey Branch carry?

About 810 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa E260 over Mackey Branch?

The structure is 28 ft (8.6 m) long with a longest span of 6 ft (1.8 m).

Who owns Nfa E260 over Mackey Branch?

It is owned by the County Highway Agency.