US Bridges

I-275 SB over 31st ST S & Ramps

Good

Pinellas County, Florida · 2.6MI N of SR-682 · Structure no. 150149

Built
1980
45 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
764 ft
5 main spans
Daily traffic
51,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-275 SB over 31st ST S & Ramps is a steel continuous stringer/multi-beam or girder carrying I-275 SB over 31st ST S & Ramps in Pinellas County, Florida. It was built in 1980, so it is 45 years old, older 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 51,750 vehicles a day, roughly 7% of them trucks, projected to reach 64,688 by 2042. The structure is 764 ft (232.9 m) long and 61 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI-275 SB
Crosses31st ST S & Ramps
Location2.6MI N of SR-682
RouteInterstate 275
CountyPinellas County
StateFlorida
Coordinates27.75833, -82.67528
Functional classUrban 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.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.7 US tons
Inventory rating35.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length764 ft (232.9 m)
Longest span233 ft (71 m)
Deck width61 ft (18.7 m)
Roadway width57 ft (17.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51,750 (2023)
Projected traffic64,688 by 2042
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-275 SB over 31st ST S & Ramps built?

It was built in 1980, making it 45 years old in 2025.

What condition is I-275 SB over 31st ST S & Ramps 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 October 2023.

How much traffic does I-275 SB over 31st ST S & Ramps carry?

About 51,750 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-275 SB over 31st ST S & Ramps?

The structure is 764 ft (232.9 m) long with a longest span of 233 ft (71 m) and a deck 61 ft wide.

Who owns I-275 SB over 31st ST S & Ramps?

It is owned by the State Highway Agency.