US Bridges

I-275 SB over Tampa Bay

Fair

Manatee County, Florida · 0.7 MI S of Skyway Bridge · Structure no. 130951

Built
1968
57 years old, rebuilt 1989
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
338 ft
7 main spans
Daily traffic
35,250
2025 count
Owner
State
State Highway Agency

About this bridge

I-275 SB over Tampa Bay is a prestressed concrete stringer/multi-beam or girder carrying I-275 SB over Tampa Bay in Manatee County, Florida. It was built in 1968 and reconstructed in 1989, so it is 57 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 35,250 vehicles a day, roughly 8% of them trucks, projected to reach 61,159 by 2047. The structure is 338 ft (102.9 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-275 SB
CrossesTampa Bay
Location0.7 MI S of Skyway Bridge
RouteInterstate 275
CountyManatee County
StateFlorida
Coordinates27.58659, -82.62049
Functional classRural 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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.2 US tons
Inventory rating33.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length338 ft (102.9 m)
Longest span48 ft (14.7 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,250 (2025)
Projected traffic61,159 by 2047
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn an Interstate toll segment under Secretarial agreement
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$23,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-275 SB over Tampa Bay built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1989.

What condition is I-275 SB over Tampa Bay 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 January 2025.

How much traffic does I-275 SB over Tampa Bay carry?

About 35,250 vehicles per day (2025 count), of which roughly 8% are trucks.

How long is I-275 SB over Tampa Bay?

The structure is 338 ft (102.9 m) long with a longest span of 48 ft (14.7 m) and a deck 43 ft wide.

Who owns I-275 SB over Tampa Bay?

It is owned by the State Highway Agency.