US Bridges

I-275 (SR-93) over Hillsborough River

Fair

Hillsborough County, Florida · 1.2 MI W of I-275 I-4 Int · Structure no. 100135

Built
1964
61 years old, rebuilt 2015
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
907 ft
11 main spans
Daily traffic
250,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-275 (SR-93) over Hillsborough River is a prestressed concrete stringer/multi-beam or girder carrying I-275 (SR-93) over Hillsborough River in Hillsborough County, Florida. It was built in 1964 and reconstructed in 2015, so it is 61 years old, older 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 250,000 vehicles a day, roughly 7% of them trucks, projected to reach 433,750 by 2046. The structure is 907 ft (276.5 m) long and 81 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-275 (SR-93)
CrossesHillsborough River
Location1.2 MI W of I-275 I-4 Int
RouteInterstate 275
CountyHillsborough County
StateFlorida
Coordinates27.95646, -82.46448
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans11
Design loadHL 93
Structure length907 ft (276.5 m)
Longest span105 ft (31.9 m)
Deck width81 ft (24.7 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic250,000 (2024)
Projected traffic433,750 by 2046
Trucks7%
Lanes on structure5
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and waterway
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$114,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-275 (SR-93) over Hillsborough River built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2015.

What condition is I-275 (SR-93) over Hillsborough River 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 August 2024.

How much traffic does I-275 (SR-93) over Hillsborough River carry?

About 250,000 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is I-275 (SR-93) over Hillsborough River?

The structure is 907 ft (276.5 m) long with a longest span of 105 ft (31.9 m) and a deck 81 ft wide.

Who owns I-275 (SR-93) over Hillsborough River?

It is owned by the State Highway Agency.