US Bridges

I-4 (SR-400) EB over Branch Forbes Road

Good

Hillsborough County, Florida · 3.5MI E of Mcintosh RD · Structure no. 100600

Built
1999
26 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
162 ft
2 main spans
Daily traffic
68,250
2024 count
Owner
State
State Highway Agency

About this bridge

I-4 (SR-400) EB over Branch Forbes Road is a prestressed concrete stringer/multi-beam or girder carrying I-4 (SR-400) EB over Branch Forbes Road in Hillsborough County, Florida. It was built in 1999, so it is 26 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 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 68,250 vehicles a day, roughly 16% of them trucks, projected to reach 118,414 by 2044. The structure is 162 ft (49.4 m) long and 59 ft wide.

Location

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CarriesI-4 (SR-400) EB
CrossesBranch Forbes Road
Location3.5MI E of Mcintosh RD
RouteInterstate 4
CountyHillsborough County
StateFlorida
Coordinates28.02686, -82.187
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating73.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length162 ft (49.4 m)
Longest span81 ft (24.7 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68,250 (2024)
Projected traffic118,414 by 2044
Trucks16%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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-4 (SR-400) EB over Branch Forbes Road built?

It was built in 1999, making it 26 years old in 2025.

What condition is I-4 (SR-400) EB over Branch Forbes Road 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 2024.

How much traffic does I-4 (SR-400) EB over Branch Forbes Road carry?

About 68,250 vehicles per day (2024 count), of which roughly 16% are trucks.

How long is I-4 (SR-400) EB over Branch Forbes Road?

The structure is 162 ft (49.4 m) long with a longest span of 81 ft (24.7 m) and a deck 59 ft wide.

Who owns I-4 (SR-400) EB over Branch Forbes Road?

It is owned by the State Highway Agency.