US Bridges

SR-78 over Flag Slough

Fair

Glades County, Florida · 0.1MILE East of SR-29 · Structure no. 050043

Built
1958
67 years old, rebuilt 1986
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
27 ft
3 main spans
Daily traffic
3,800
2024 count
Owner
State
State Highway Agency

About this bridge

SR-78 over Flag Slough is a concrete culvert carrying SR-78 over Flag Slough in Glades County, Florida. It was built in 1958 and reconstructed in 1986, so it is 67 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 5 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 3,800 vehicles a day, roughly 30% of them trucks, projected to reach 6,593 by 2044. The structure is 27 ft (8.1 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesSR-78
CrossesFlag Slough
Location0.1MILE East of SR-29
RouteState Highway 78
CountyGlades County
StateFlorida
Coordinates26.81238, -81.41089
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 15
Structure length27 ft (8.1 m)
Longest span9 ft (2.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,800 (2024)
Projected traffic6,593 by 2044
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR-78 over Flag Slough built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1986.

What condition is SR-78 over Flag 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 February 2024.

How much traffic does SR-78 over Flag Slough carry?

About 3,800 vehicles per day (2024 count), of which roughly 30% are trucks.

How long is SR-78 over Flag Slough?

The structure is 27 ft (8.1 m) long with a longest span of 9 ft (2.6 m).

Who owns SR-78 over Flag Slough?

It is owned by the State Highway Agency.