US Bridges

I-275 NB over Slope

Good

Hillsborough County, Florida · 2.5MI. E of Dale Mabry · Structure no. 100611

Built
2009
16 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
65 ft
1 main span
Daily traffic
12,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-275 NB over Slope is a prestressed concrete stringer/multi-beam or girder carrying I-275 NB over Slope in Hillsborough County, Florida. It was built in 2009, so it is 16 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 12,500 vehicles a day, roughly 6% of them trucks, projected to reach 21,688 by 2042. The structure is 65 ft (19.8 m) long and 39 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Location

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CarriesI-275 NB
CrossesSlope
Location2.5MI. E of Dale Mabry
RouteInterstate 275
CountyHillsborough County
StateFlorida
Coordinates27.95606, -82.46364
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78 US tons
Inventory rating46.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length65 ft (19.8 m)
Longest span65 ft (19.8 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,500 (2023)
Projected traffic21,688 by 2042
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed4.3 mi (7 km)
TollOn a free road
National Highway SystemYes

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 Slope built?

It was built in 2009, making it 16 years old in 2025.

What condition is I-275 NB over Slope 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 March 2023.

How much traffic does I-275 NB over Slope carry?

About 12,500 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-275 NB over Slope?

The structure is 65 ft (19.8 m) long with a longest span of 65 ft (19.8 m) and a deck 39 ft wide.

Who owns I-275 NB over Slope?

It is owned by the State Highway Agency.