US Bridges

I40 over I-40 / N. Dunlap St.

Fair

Shelby County, Tennessee · .5 MI E of US-51 · Structure no. 79I00400011

Built
1968
57 years old, rebuilt 1988
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
145 ft
3 main spans
Daily traffic
62,695
2021 count
Owner
State
State Highway Agency

About this bridge

I40 over I-40 / N. Dunlap St. is a prestressed concrete continuous box beam or girders - single or spread carrying I40 over I-40 / N. Dunlap St. in Shelby County, Tennessee. It was built in 1968 and reconstructed in 1988, so it is 57 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.

It carries about 62,695 vehicles a day, roughly 8% of them trucks, projected to reach 100,312 by 2042. The structure is 145 ft (44.3 m) long and 124 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

Location

Open in Google Maps
CarriesI40
CrossesI-40 / N. Dunlap St.
Location.5 MI E of US-51
RouteInterstate 40
CountyShelby County
StateTennessee
Coordinates35.01623, -90.03239
Functional classUrban Principal Arterial - Interstate

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length145 ft (44.3 m)
Longest span76 ft (23.2 m)
Deck width124 ft (37.9 m)
Roadway width122 ft (37.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62,695 (2021)
Projected traffic100,312 by 2042
Trucks8%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed12.4 mi (20 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 I40 over I-40 / N. Dunlap St. built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1988.

What condition is I40 over I-40 / N. Dunlap St. 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 I40 over I-40 / N. Dunlap St. carry?

About 62,695 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is I40 over I-40 / N. Dunlap St.?

The structure is 145 ft (44.3 m) long with a longest span of 76 ft (23.2 m) and a deck 124 ft wide.

Who owns I40 over I-40 / N. Dunlap St.?

It is owned by the State Highway Agency.