US Bridges

I-75 SB over I-4 and Ramp C-1

Fair

Hillsborough County, Florida · I-75 & I-4 Interchange · Structure no. 100393

Built
1984
41 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
502 ft
7 main spans
Daily traffic
83,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over I-4 and Ramp C-1 is a prestressed concrete stringer/multi-beam or girder carrying I-75 SB over I-4 and Ramp C-1 in Hillsborough County, Florida. It was built in 1984, so it is 41 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 83,500 vehicles a day, roughly 11% of them trucks, projected to reach 144,872 by 2042. The structure is 502 ft (153 m) long and 60 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-75 SB
CrossesI-4 and Ramp C-1
LocationI-75 & I-4 Interchange
RouteInterstate 75
CountyHillsborough County
StateFlorida
Coordinates28.00207, -82.32731
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 inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length502 ft (153 m)
Longest span101 ft (30.7 m)
Deck width60 ft (18.3 m)
Roadway width56 ft (17.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83,500 (2023)
Projected traffic144,872 by 2042
Trucks11%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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 statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$11,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 SB over I-4 and Ramp C-1 built?

It was built in 1984, making it 41 years old in 2025.

What condition is I-75 SB over I-4 and Ramp C-1 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 December 2023.

How much traffic does I-75 SB over I-4 and Ramp C-1 carry?

About 83,500 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I-75 SB over I-4 and Ramp C-1?

The structure is 502 ft (153 m) long with a longest span of 101 ft (30.7 m) and a deck 60 ft wide.

Who owns I-75 SB over I-4 and Ramp C-1?

It is owned by the State Highway Agency.