US Bridges

I-75 NB (SR-93) over Tidal Marsh

Good

Lee County, Florida · 0.6MI South of SR-78 · Structure no. 120103

Built
1978
47 years old, rebuilt 2015
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
950 ft
21 main spans
Daily traffic
47,250
2024 count
Owner
State
State Highway Agency

About this bridge

I-75 NB (SR-93) over Tidal Marsh is a prestressed concrete stringer/multi-beam or girder carrying I-75 NB (SR-93) over Tidal Marsh in Lee County, Florida. It was built in 1978 and reconstructed in 2015, so it is 47 years old, older 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 47,250 vehicles a day, roughly 16% of them trucks, projected to reach 81,979 by 2044. The structure is 950 ft (289.6 m) long and 71 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-75 NB (SR-93)
CrossesTidal Marsh
Location0.6MI South of SR-78
RouteInterstate 75
CountyLee County
StateFlorida
Coordinates26.70824, -81.80611
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans21
Design loadHL 93
Structure length950 ft (289.6 m)
Longest span45 ft (13.8 m)
Deck width71 ft (21.7 m)
Roadway width68 ft (20.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,250 (2024)
Projected traffic81,979 by 2044
Trucks16%
Lanes on structure2
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 NB (SR-93) over Tidal Marsh built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2015.

What condition is I-75 NB (SR-93) over Tidal Marsh 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 May 2024.

How much traffic does I-75 NB (SR-93) over Tidal Marsh carry?

About 47,250 vehicles per day (2024 count), of which roughly 16% are trucks.

How long is I-75 NB (SR-93) over Tidal Marsh?

The structure is 950 ft (289.6 m) long with a longest span of 45 ft (13.8 m) and a deck 71 ft wide.

Who owns I-75 NB (SR-93) over Tidal Marsh?

It is owned by the State Highway Agency.