US Bridges

Loop Road over Slough

Fair

Collier County, Florida · 2.1 Miles from Park Borde · Structure no. 5120033P0000000

Built
1960
65 years old
Condition
Fair
inspected April 2023
Type
Slab
Prestressed Concrete
Length
60 ft
4 main spans
Daily traffic
5
2016 count
Owner
Federal
National Park Service

About this bridge

Loop Road over Slough is a prestressed concrete slab carrying Loop Road over Slough in Collier County, Florida. It was built in 1960, so it is 65 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 5 vehicles a day, projected to reach 5 by 2036. The structure is 60 ft (18.3 m) long and 26 ft wide.

Location

Open in Google Maps
CarriesLoop Road
CrossesSlough
Location2.1 Miles from Park Borde
RouteFederal Lands Road 0
CountyCollier County
StateFlorida
Coordinates25.76067, -80.85847
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.1 US tons
Inventory rating27 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadH 15
Structure length60 ft (18.3 m)
Longest span15 ft (4.6 m)
Deck width26 ft (7.8 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2016)
Projected traffic5 by 2036
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$23,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Loop Road over Slough built?

It was built in 1960, making it 65 years old in 2025.

What condition is Loop Road over Slough 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 Loop Road over Slough carry?

About 5 vehicles per day (2016 count).

How long is Loop Road over Slough?

The structure is 60 ft (18.3 m) long with a longest span of 15 ft (4.6 m) and a deck 26 ft wide.

Who owns Loop Road over Slough?

It is owned by the National Park Service.