US Bridges

I-4 (SR-400) WB over Alexander ST (sr 39A)

Fair

Hillsborough County, Florida · 1.6MI West of SR-39 · Structure no. 100603

Built
1999
26 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
157 ft
2 main spans
Daily traffic
62,750
2024 count
Owner
State
State Highway Agency

About this bridge

I-4 (SR-400) WB over Alexander ST (sr 39A) is a prestressed concrete stringer/multi-beam or girder carrying I-4 (SR-400) WB over Alexander ST (sr 39A) in Hillsborough County, Florida. It was built in 1999, so it is 26 years old, younger than the Florida average of 41.3 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 62,750 vehicles a day, roughly 11% of them trucks, projected to reach 108,871 by 2044. The structure is 157 ft (47.9 m) long and 101 ft wide.

Location

Open in Google Maps
CarriesI-4 (SR-400) WB
CrossesAlexander ST (sr 39A)
Location1.6MI West of SR-39
RouteInterstate 4
CountyHillsborough County
StateFlorida
Coordinates28.0325, -82.13417
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
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 rating110.1 US tons
Inventory rating65.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length157 ft (47.9 m)
Longest span78 ft (23.9 m)
Deck width101 ft (30.8 m)
Roadway width97 ft (29.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62,750 (2024)
Projected traffic108,871 by 2044
Trucks11%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-4 (SR-400) WB over Alexander ST (sr 39A) built?

It was built in 1999, making it 26 years old in 2025.

What condition is I-4 (SR-400) WB over Alexander ST (sr 39A) 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 I-4 (SR-400) WB over Alexander ST (sr 39A) carry?

About 62,750 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is I-4 (SR-400) WB over Alexander ST (sr 39A)?

The structure is 157 ft (47.9 m) long with a longest span of 78 ft (23.9 m) and a deck 101 ft wide.

Who owns I-4 (SR-400) WB over Alexander ST (sr 39A)?

It is owned by the State Highway Agency.