US Bridges

I-275 (SR-55) NB over Tampa Bay

Good

Manatee County, Florida · 0.7 MI S of Skyway Bridge · Structure no. 130139

Built
1990
35 years old
Condition
Good
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 (SR-55) NB over Tampa Bay is a prestressed concrete stringer/multi-beam or girder carrying I-275 (SR-55) NB over Tampa Bay in Manatee County, Florida. It was built in 1990, so it is 35 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 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 51 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-275 (SR-55) NB
CrossesTampa Bay
Location0.7 MI S of Skyway Bridge
RouteInterstate 275
CountyManatee County
StateFlorida
Coordinates27.58678, -82.62036
Functional classRural 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 protection9 ExcellentNo 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating27.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length338 ft (102.9 m)
Longest span48 ft (14.6 m)
Deck width51 ft (15.5 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,250 (2025)
Projected traffic61,159 by 2047
Trucks8%
Lanes on structure3
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$128,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-275 (SR-55) NB over Tampa Bay built?

It was built in 1990, making it 35 years old in 2025.

What condition is I-275 (SR-55) NB over Tampa Bay 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 January 2025.

How much traffic does I-275 (SR-55) NB over Tampa Bay carry?

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

How long is I-275 (SR-55) NB over Tampa Bay?

The structure is 338 ft (102.9 m) long with a longest span of 48 ft (14.6 m) and a deck 51 ft wide.

Who owns I-275 (SR-55) NB over Tampa Bay?

It is owned by the State Highway Agency.