US Bridges

SW 66th ST over I-75

Fair

Marion County, Florida · SW 66th ST over I-75 · Structure no. 360048

Built
1964
61 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
273 ft
4 main spans
Daily traffic
6,900
2024 count
Owner
State
State Highway Agency

About this bridge

SW 66th ST over I-75 is a prestressed concrete stringer/multi-beam or girder carrying SW 66th ST over I-75 in Marion County, Florida. It was built in 1964, so it is 61 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 6,900 vehicles a day, roughly 7% of them trucks, projected to reach 11,972 by 2045. The structure is 273 ft (83.1 m) long and 34 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Location

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CarriesSW 66th ST
CrossesI-75
LocationSW 66th ST over I-75
RouteCounty Highway 0
CountyMarion County
StateFlorida
Coordinates29.12092, -82.18477
Functional classUrban Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.2 US tons
Inventory rating39.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length273 ft (83.1 m)
Longest span69 ft (21 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,900 (2024)
Projected traffic11,972 by 2045
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed4.3 mi (7 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 SW 66th ST over I-75 built?

It was built in 1964, making it 61 years old in 2025.

What condition is SW 66th ST over I-75 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 April 2023.

How much traffic does SW 66th ST over I-75 carry?

About 6,900 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is SW 66th ST over I-75?

The structure is 273 ft (83.1 m) long with a longest span of 69 ft (21 m) and a deck 34 ft wide.

Who owns SW 66th ST over I-75?

It is owned by the State Highway Agency.