US Bridges

I-75 over Harney Flats Canal

Good

Hillsborough County, Florida · 0.2MI North of I-4 · Structure no. 100418

Built
1985
40 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
50 ft
4 main spans
Daily traffic
156,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 over Harney Flats Canal is a concrete culvert carrying I-75 over Harney Flats Canal 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 156,500 vehicles a day, roughly 14% of them trucks, projected to reach 271,528 by 2042. The structure is 50 ft (15.2 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesI-75
CrossesHarney Flats Canal
Location0.2MI North of I-4
RouteInterstate 75
CountyHillsborough County
StateFlorida
Coordinates28.00863, -82.32782
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.2 US tons
Inventory rating43.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHL 93
Structure length50 ft (15.2 m)
Longest span12 ft (3.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic156,500 (2023)
Projected traffic271,528 by 2042
Trucks14%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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-75 over Harney Flats Canal built?

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

What condition is I-75 over Harney Flats Canal 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-75 over Harney Flats Canal carry?

About 156,500 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is I-75 over Harney Flats Canal?

The structure is 50 ft (15.2 m) long with a longest span of 12 ft (3.8 m).

Who owns I-75 over Harney Flats Canal?

It is owned by the State Highway Agency.