US Bridges

I-95 (SR-9) over Trestle Bay Swamp

Fair

St. Johns County, Florida · 3.3 Mi. N. of SR-207 · Structure no. 780050

Built
1966
59 years old
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
38 ft
3 main spans
Daily traffic
90,000
2022 count
Owner
State
State Highway Agency

About this bridge

I-95 (SR-9) over Trestle Bay Swamp is a concrete culvert carrying I-95 (SR-9) over Trestle Bay Swamp in St. Johns County, Florida. It was built in 1966, so it is 59 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 90,000 vehicles a day, roughly 5% of them trucks, projected to reach 156,150 by 2044. The structure is 38 ft (11.6 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesI-95 (SR-9)
CrossesTrestle Bay Swamp
Location3.3 Mi. N. of SR-207
RouteInterstate 95
CountySt. Johns County
StateFlorida
Coordinates29.86972, -81.3975
Functional classRural Principal Arterial - Interstate

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 inspectionDecember 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.7 US tons
Inventory rating49.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length38 ft (11.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90,000 (2022)
Projected traffic156,150 by 2044
Trucks5%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-95 (SR-9) over Trestle Bay Swamp built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-95 (SR-9) over Trestle Bay Swamp 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 December 2023.

How much traffic does I-95 (SR-9) over Trestle Bay Swamp carry?

About 90,000 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is I-95 (SR-9) over Trestle Bay Swamp?

The structure is 38 ft (11.6 m) long with a longest span of 12 ft (3.7 m).

Who owns I-95 (SR-9) over Trestle Bay Swamp?

It is owned by the State Highway Agency.