US Bridges

I-275 NB (SR-93) over Hillsborough River

Fair

Hillsborough County, Florida · 1.2MI W of I-275/I-4 Int · Structure no. 100136

Built
1964
61 years old, rebuilt 2009
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
930 ft
11 main spans
Daily traffic
250,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-275 NB (SR-93) over Hillsborough River is a prestressed concrete stringer/multi-beam or girder carrying I-275 NB (SR-93) over Hillsborough River in Hillsborough County, Florida. It was built in 1964 and reconstructed in 2009, 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 930 ft (283.5 m) long and 77 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-275 NB (SR-93)
CrossesHillsborough River
Location1.2MI W of I-275/I-4 Int
RouteInterstate 275
CountyHillsborough County
StateFlorida
Coordinates27.95614, -82.46455
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61 US tons
Inventory rating39.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20 + Mod
Structure length930 ft (283.5 m)
Longest span105 ft (32 m)
Deck width77 ft (23.6 m)
Roadway width72 ft (22 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic250,000 (2024)
Projected traffic433,750 by 2046
Trucks7%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
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 NB (SR-93) over Hillsborough River built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2009.

What condition is I-275 NB (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 NB (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 NB (SR-93) over Hillsborough River?

The structure is 930 ft (283.5 m) long with a longest span of 105 ft (32 m) and a deck 77 ft wide.

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

It is owned by the State Highway Agency.