US Bridges

US98 SR30 over Slough

Fair

Gulf County, Florida · 0.2 MI W of County Line · Structure no. 510044

Built
1957
68 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
2,594
2022 count
Owner
State
State Highway Agency

About this bridge

US98 SR30 over Slough is a concrete culvert carrying US98 SR30 over Slough in Gulf County, Florida. It was built in 1957, so it is 68 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 2,594 vehicles a day, roughly 11% of them trucks, projected to reach 4,501 by 2044. The structure is 21 ft (6.3 m) long. If it were closed, the detour would be 88.9 mi (143 km).

Location

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CarriesUS98 SR30
CrossesSlough
Location0.2 MI W of County Line
RouteU.S. Route 98
CountyGulf County
StateFlorida
Coordinates29.73719, -85.17286
Functional classRural Principal Arterial - Other

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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.8 US tons
Inventory rating45.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.3 m)
Longest span10 ft (3.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,594 (2022)
Projected traffic4,501 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed88.9 mi (143 km)
TollOn a free road
National Highway SystemYes

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 US98 SR30 over Slough built?

It was built in 1957, making it 68 years old in 2025.

What condition is US98 SR30 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 August 2023.

How much traffic does US98 SR30 over Slough carry?

About 2,594 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is US98 SR30 over Slough?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3.1 m).

Who owns US98 SR30 over Slough?

It is owned by the State Highway Agency.