US Bridges

I-275 NB over 30th Avenue North

Good

Pinellas County, Florida · 1.5MI North of SR-595 · Structure no. 150089

Built
1974
51 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
176 ft
3 main spans
Daily traffic
15,800
2023 count
Owner
State
State Highway Agency

About this bridge

I-275 NB over 30th Avenue North is a prestressed concrete stringer/multi-beam or girder carrying I-275 NB over 30th Avenue North in Pinellas County, Florida. It was built in 1974, so it is 51 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 15,800 vehicles a day, roughly 6% of them trucks, projected to reach 274,136 by 2042. The structure is 176 ft (53.6 m) long and 60 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI-275 NB
Crosses30th Avenue North
Location1.5MI North of SR-595
RouteInterstate 275
CountyPinellas County
StateFlorida
Coordinates27.79925, -82.66253
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 alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length176 ft (53.6 m)
Longest span75 ft (23 m)
Deck width60 ft (18.3 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,800 (2023)
Projected traffic274,136 by 2042
Trucks6%
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 NB over 30th Avenue North built?

It was built in 1974, making it 51 years old in 2025.

What condition is I-275 NB over 30th Avenue North 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 NB over 30th Avenue North carry?

About 15,800 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-275 NB over 30th Avenue North?

The structure is 176 ft (53.6 m) long with a longest span of 75 ft (23 m) and a deck 60 ft wide.

Who owns I-275 NB over 30th Avenue North?

It is owned by the State Highway Agency.