US Bridges

I124 Nbl over W. 4th ST (sr 389)

Good

Hamilton County, Tennessee · 1 MI S of Tn River · Structure no. 33I01240017

Built
2020
5 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
1 main span
Daily traffic
68,385
2021 count
Owner
State
State Highway Agency

About this bridge

I124 Nbl over W. 4th ST (sr 389) is a prestressed concrete stringer/multi-beam or girder carrying I124 Nbl over W. 4th ST (sr 389) in Hamilton County, Tennessee. It was built in 2020, so it is 5 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 68,385 vehicles a day, roughly 6% of them trucks, projected to reach 116,128 by 2040. The structure is 120 ft (36.6 m) long and 62 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI124 Nbl
CrossesW. 4th ST (sr 389)
Location1 MI S of Tn River
RouteInterstate 124
CountyHamilton County
StateTennessee
Coordinates35.05205, -85.3143
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length120 ft (36.6 m)
Longest span115 ft (35.2 m)
Deck width62 ft (18.9 m)
Roadway width59 ft (18.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68,385 (2021)
Projected traffic116,128 by 2040
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I124 Nbl over W. 4th ST (sr 389) built?

It was built in 2020, making it 5 years old in 2025.

What condition is I124 Nbl over W. 4th ST (sr 389) 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 August 2024.

How much traffic does I124 Nbl over W. 4th ST (sr 389) carry?

About 68,385 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I124 Nbl over W. 4th ST (sr 389)?

The structure is 120 ft (36.6 m) long with a longest span of 115 ft (35.2 m) and a deck 62 ft wide.

Who owns I124 Nbl over W. 4th ST (sr 389)?

It is owned by the State Highway Agency.