US Bridges

I-275 over Big Island Gap

Fair

Pinellas County, Florida · Intersec SR-688 & I-275 · Structure no. 150252

Built
2004
21 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
260 ft
3 main spans
Daily traffic
144,000
2023 count
Owner
State
State Highway Agency

About this bridge

I-275 over Big Island Gap is a prestressed concrete stringer/multi-beam or girder carrying I-275 over Big Island Gap in Pinellas County, Florida. It was built in 2004, so it is 21 years old, younger 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 144,000 vehicles a day, roughly 7% of them trucks, projected to reach 249,840 by 2042. The structure is 260 ft (79.2 m) long and 208 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesI-275
CrossesBig Island Gap
LocationIntersec SR-688 & I-275
RouteInterstate 275
CountyPinellas County
StateFlorida
Coordinates27.89715, -82.64181
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2023
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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating58 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length260 ft (79.2 m)
Longest span87 ft (26.5 m)
Deck width208 ft (63.5 m)
Roadway width208 ft (63.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic144,000 (2023)
Projected traffic249,840 by 2042
Trucks7%
Lanes on structure12
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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-275 over Big Island Gap built?

It was built in 2004, making it 21 years old in 2025.

What condition is I-275 over Big Island Gap 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 October 2023.

How much traffic does I-275 over Big Island Gap carry?

About 144,000 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-275 over Big Island Gap?

The structure is 260 ft (79.2 m) long with a longest span of 87 ft (26.5 m) and a deck 208 ft wide.

Who owns I-275 over Big Island Gap?

It is owned by the State Highway Agency.