US Bridges

Countyline Road over I-75 & I-275 SB

Good

Hillsborough County, Florida · 2.5MI W of CR-581 · Structure no. 100492

Built
1985
40 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
466 ft
6 main spans
Daily traffic
16,600
2023 count
Owner
State
State Highway Agency

About this bridge

Countyline Road over I-75 & I-275 SB is a prestressed concrete stringer/multi-beam or girder carrying Countyline Road over I-75 & I-275 SB in Hillsborough County, Florida. It was built in 1985, so it is 40 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 16,600 vehicles a day, roughly 9% of them trucks, projected to reach 28,801 by 2042. The structure is 466 ft (142 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesCountyline Road
CrossesI-75 & I-275 SB
Location2.5MI W of CR-581
RouteCounty Highway 0
CountyHillsborough County
StateFlorida
Coordinates28.17125, -82.39428
Functional classUrban Collector

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 inspectionNovember 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 rating57 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length466 ft (142 m)
Longest span103 ft (31.4 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,600 (2023)
Projected traffic28,801 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

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 Countyline Road over I-75 & I-275 SB built?

It was built in 1985, making it 40 years old in 2025.

What condition is Countyline Road over I-75 & I-275 SB 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 November 2023.

How much traffic does Countyline Road over I-75 & I-275 SB carry?

About 16,600 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Countyline Road over I-75 & I-275 SB?

The structure is 466 ft (142 m) long with a longest span of 103 ft (31.4 m) and a deck 43 ft wide.

Who owns Countyline Road over I-75 & I-275 SB?

It is owned by the State Highway Agency.