US Bridges

I-75 SB to I-4 EB over I-4 & Ramp A-1

Good

Hillsborough County, Florida · I-4 & I-75 Interchange · Structure no. 100426

Built
1985
40 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
389 ft
5 main spans
Daily traffic
13,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 SB to I-4 EB over I-4 & Ramp A-1 is a prestressed concrete stringer/multi-beam or girder carrying I-75 SB to I-4 EB over I-4 & Ramp A-1 in Hillsborough County, Florida. It was built in 1985, so it is 40 years old, younger than the Florida average of 41.3 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 13,500 vehicles a day, roughly 9% of them trucks, projected to reach 16,875 by 2042. The structure is 389 ft (118.6 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-75 SB to I-4 EB
CrossesI-4 & Ramp A-1
LocationI-4 & I-75 Interchange
RouteInterstate 75
CountyHillsborough County
StateFlorida
Coordinates28.00153, -82.33033
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 inspectionDecember 2023
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 alignment7: Better than present minimum criteria
Operating rating74 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length389 ft (118.6 m)
Longest span108 ft (32.9 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,500 (2023)
Projected traffic16,875 by 2042
Trucks9%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

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-75 SB to I-4 EB over I-4 & Ramp A-1 built?

It was built in 1985, making it 40 years old in 2025.

What condition is I-75 SB to I-4 EB over I-4 & Ramp A-1 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 December 2023.

How much traffic does I-75 SB to I-4 EB over I-4 & Ramp A-1 carry?

About 13,500 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-75 SB to I-4 EB over I-4 & Ramp A-1?

The structure is 389 ft (118.6 m) long with a longest span of 108 ft (32.9 m) and a deck 30 ft wide.

Who owns I-75 SB to I-4 EB over I-4 & Ramp A-1?

It is owned by the State Highway Agency.