US Bridges

NW 120th Street over I-75

Fair

Marion County, Florida · NW 120th Street over I-75 · Structure no. 360951

Built
1964
61 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
286 ft
4 main spans
Daily traffic
300
2022 count
Owner
State
State Highway Agency

About this bridge

NW 120th Street over I-75 is a prestressed concrete stringer/multi-beam or girder carrying NW 120th Street 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 300 vehicles a day, roughly 7% of them trucks, projected to reach 521 by 2042. The structure is 286 ft (87.3 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesNW 120th Street
CrossesI-75
LocationNW 120th Street over I-75
RouteCounty Highway 75
StateFlorida
Coordinates29.3232, -82.21228
Functional classRural Local

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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.6 US tons
Inventory rating48.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length286 ft (87.3 m)
Longest span72 ft (21.9 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2022)
Projected traffic521 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 NW 120th Street over I-75 built?

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

What condition is NW 120th Street 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 May 2023.

How much traffic does NW 120th Street over I-75 carry?

About 300 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is NW 120th Street over I-75?

The structure is 286 ft (87.3 m) long with a longest span of 72 ft (21.9 m) and a deck 34 ft wide.

Who owns NW 120th Street over I-75?

It is owned by the State Highway Agency.