US Bridges

I-75 (SR-93) SB over Turnback Slough

Good

Collier County, Florida · 6.1MI West of SR-29 · Structure no. 030216

Built
1990
35 years old
Condition
Good
inspected May 2023
Type
Slab
Prestressed Concrete
Length
120 ft
3 main spans
Daily traffic
14,261
2022 count
Owner
State
State Highway Agency

About this bridge

I-75 (SR-93) SB over Turnback Slough is a prestressed concrete slab carrying I-75 (SR-93) SB over Turnback Slough in Collier County, Florida. It was built in 1990, so it is 35 years old, younger 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 14,261 vehicles a day, roughly 13% of them trucks, projected to reach 24,742 by 2044. The structure is 120 ft (36.6 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-75 (SR-93) SB
CrossesTurnback Slough
Location6.1MI West of SR-29
RouteInterstate 75
CountyCollier County
StateFlorida
Coordinates26.15323, -81.44811
Functional classRural 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.
Substructure8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.7 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20 + Mod
Structure length120 ft (36.6 m)
Longest span40 ft (12.2 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,261 (2022)
Projected traffic24,742 by 2044
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed0.6 mi (1 km)
TollOn an Interstate toll segment under Secretarial agreement
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 (SR-93) SB over Turnback Slough built?

It was built in 1990, making it 35 years old in 2025.

What condition is I-75 (SR-93) SB over Turnback Slough 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 2023.

How much traffic does I-75 (SR-93) SB over Turnback Slough carry?

About 14,261 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is I-75 (SR-93) SB over Turnback Slough?

The structure is 120 ft (36.6 m) long with a longest span of 40 ft (12.2 m) and a deck 43 ft wide.

Who owns I-75 (SR-93) SB over Turnback Slough?

It is owned by the State Highway Agency.