US Bridges

US 301 to I-75 NB over I-75NB - SR618WB

Fair

Hillsborough County, Florida · 0.4MI North of US-301 · Structure no. 100491

Built
1985
40 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Single or Spread
Steel
Length
266 ft
1 main span
Daily traffic
17,500
2023 count
Owner
State
State Highway Agency

About this bridge

US 301 to I-75 NB over I-75NB - SR618WB is a steel box beam or girders - single or spread carrying US 301 to I-75 NB over I-75NB - SR618WB 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 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 17,500 vehicles a day, roughly 4% of them trucks, projected to reach 30,362 by 2042. The structure is 266 ft (81.1 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesUS 301 to I-75 NB
CrossesI-75NB - SR618WB
Location0.4MI North of US-301
RouteInterstate 75
CountyHillsborough County
StateFlorida
Coordinates27.90878, -82.33991
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating60 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length266 ft (81.1 m)
Longest span266 ft (81.1 m)
Deck width44 ft (13.4 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,500 (2023)
Projected traffic30,362 by 2042
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 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 US 301 to I-75 NB over I-75NB - SR618WB built?

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

What condition is US 301 to I-75 NB over I-75NB - SR618WB 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 October 2023.

How much traffic does US 301 to I-75 NB over I-75NB - SR618WB carry?

About 17,500 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 301 to I-75 NB over I-75NB - SR618WB?

The structure is 266 ft (81.1 m) long with a longest span of 266 ft (81.1 m) and a deck 44 ft wide.

Who owns US 301 to I-75 NB over I-75NB - SR618WB?

It is owned by the State Highway Agency.