US Bridges

I-275 NB over 50th Ave N SR-689

Good

Pinellas County, Florida · 2.3 MI S of Gandy Blvd · Structure no. 150095

Built
1972
53 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
156 ft
3 main spans
Daily traffic
155,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-275 NB over 50th Ave N SR-689 is a prestressed concrete stringer/multi-beam or girder carrying I-275 NB over 50th Ave N SR-689 in Pinellas County, Florida. It was built in 1972, so it is 53 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 155,500 vehicles a day, roughly 7% of them trucks, projected to reach 269,793 by 2042. The structure is 156 ft (47.5 m) long and 80 ft wide.

Location

Open in Google Maps
CarriesI-275 NB
Crosses50th Ave N SR-689
Location2.3 MI S of Gandy Blvd
RouteInterstate 275
CountyPinellas County
StateFlorida
Coordinates27.8175, -82.66451
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length156 ft (47.5 m)
Longest span80 ft (24.4 m)
Deck width80 ft (24.4 m)
Roadway width76 ft (23.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic155,500 (2023)
Projected traffic269,793 by 2042
Trucks7%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 50th Ave N SR-689 built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-275 NB over 50th Ave N SR-689 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 50th Ave N SR-689 carry?

About 155,500 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-275 NB over 50th Ave N SR-689?

The structure is 156 ft (47.5 m) long with a longest span of 80 ft (24.4 m) and a deck 80 ft wide.

Who owns I-275 NB over 50th Ave N SR-689?

It is owned by the State Highway Agency.