US Bridges

I-75 NB (SR-93A) over Hillsborough River

Good

Hillsborough County, Florida · 1.2MI North of CR-582A · Structure no. 100388

Built
1984
41 years old, rebuilt 2014
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
456 ft
7 main spans
Daily traffic
117,000
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 NB (SR-93A) over Hillsborough River is a prestressed concrete stringer/multi-beam or girder carrying I-75 NB (SR-93A) over Hillsborough River in Hillsborough County, Florida. It was built in 1984 and reconstructed in 2014, 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 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 117,000 vehicles a day, roughly 14% of them trucks, projected to reach 202,995 by 2042. The structure is 456 ft (139 m) long and 71 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-75 NB (SR-93A)
CrossesHillsborough River
Location1.2MI North of CR-582A
RouteInterstate 75
CountyHillsborough County
StateFlorida
Coordinates28.08727, -82.35357
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHL 93
Structure length456 ft (139 m)
Longest span68 ft (20.6 m)
Deck width71 ft (21.7 m)
Roadway width69 ft (21 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic117,000 (2023)
Projected traffic202,995 by 2042
Trucks14%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 NB (SR-93A) over Hillsborough River built?

It was built in 1984, making it 41 years old in 2025. It was reconstructed in 2014.

What condition is I-75 NB (SR-93A) over Hillsborough River 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 November 2023.

How much traffic does I-75 NB (SR-93A) over Hillsborough River carry?

About 117,000 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is I-75 NB (SR-93A) over Hillsborough River?

The structure is 456 ft (139 m) long with a longest span of 68 ft (20.6 m) and a deck 71 ft wide.

Who owns I-75 NB (SR-93A) over Hillsborough River?

It is owned by the State Highway Agency.