US Bridges

SR-A1A & SR-200 over Nann Swamp

Good

Nassau County, Florida · 3.8 Mi. W. of I-95 · Structure no. 740058

Built
1936
89 years old, rebuilt 2006
Condition
Good
inspected September 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
22,000
2023 count
Owner
State
State Highway Agency

About this bridge

SR-A1A & SR-200 over Nann Swamp is a concrete culvert carrying SR-A1A & SR-200 over Nann Swamp in Nassau County, Florida. It was built in 1936 and reconstructed in 2006, so it is 89 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 22,000 vehicles a day, roughly 9% of them trucks, projected to reach 38,170 by 2045. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 24.2 mi (39 km).

Location

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CarriesSR-A1A & SR-200
CrossesNann Swamp
Location3.8 Mi. W. of I-95
RouteState Highway 0A1A
CountyNassau County
StateFlorida
Coordinates30.61596, -81.71014
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2023)
Projected traffic38,170 by 2045
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR-A1A & SR-200 over Nann Swamp built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 2006.

What condition is SR-A1A & SR-200 over Nann Swamp 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 September 2024.

How much traffic does SR-A1A & SR-200 over Nann Swamp carry?

About 22,000 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR-A1A & SR-200 over Nann Swamp?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns SR-A1A & SR-200 over Nann Swamp?

It is owned by the State Highway Agency.