US Bridges

I-75 SB over Little Manatee River

Fair

Hillsborough County, Florida · 4.5MI South of SR-674 · Structure no. 100353

Built
1981
44 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,391 ft
20 main spans
Daily traffic
88,000
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over Little Manatee River is a prestressed concrete stringer/multi-beam or girder carrying I-75 SB over Little Manatee River in Hillsborough County, Florida. It was built in 1981, so it is 44 years old, older than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 88,000 vehicles a day, roughly 17% of them trucks, projected to reach 152,680 by 2042. The structure is 1,391 ft (424 m) long and 59 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI-75 SB
CrossesLittle Manatee River
Location4.5MI South of SR-674
RouteInterstate 75
StateFlorida
Coordinates27.66705, -82.43231
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.7 US tons
Inventory rating40 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans20
Design loadHS 20 + Mod
Structure length1,391 ft (424 m)
Longest span69 ft (21 m)
Deck width59 ft (17.9 m)
Roadway width56 ft (17 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic88,000 (2023)
Projected traffic152,680 by 2042
Trucks17%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$388,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-75 SB over Little Manatee River built?

It was built in 1981, making it 44 years old in 2025.

What condition is I-75 SB over Little Manatee River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does I-75 SB over Little Manatee River carry?

About 88,000 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is I-75 SB over Little Manatee River?

The structure is 1,391 ft (424 m) long with a longest span of 69 ft (21 m) and a deck 59 ft wide.

Who owns I-75 SB over Little Manatee River?

It is owned by the State Highway Agency.