US Bridges

I-95 NB (SR-9) over St. Marys River

Fair

Nassau County, Florida · I-95 / St. Marys River · Structure no. 740089

Built
1971
54 years old, rebuilt 1998
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,250 ft
3 main spans
Daily traffic
75,637
2023 count
Owner
State
State Highway Agency

About this bridge

I-95 NB (SR-9) over St. Marys River is a steel continuous stringer/multi-beam or girder carrying I-95 NB (SR-9) over St. Marys River in Nassau County, Florida. It was built in 1971 and reconstructed in 1998, so it is 54 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 75,637 vehicles a day, roughly 10% of them trucks, projected to reach 131,230 by 2045. The structure is 1,250 ft (381 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-95 NB (SR-9)
CrossesSt. Marys River
LocationI-95 / St. Marys River
RouteInterstate 95
CountyNassau County
StateFlorida
Coordinates30.74361, -81.65444
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+9 approach)
Design loadHS 20 + Mod
Structure length1,250 ft (381 m)
Longest span154 ft (46.9 m)
Deck width66 ft (20 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75,637 (2023)
Projected traffic131,230 by 2045
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-95 NB (SR-9) over St. Marys River built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 1998.

What condition is I-95 NB (SR-9) over St. Marys River 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 May 2024.

How much traffic does I-95 NB (SR-9) over St. Marys River carry?

About 75,637 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-95 NB (SR-9) over St. Marys River?

The structure is 1,250 ft (381 m) long with a longest span of 154 ft (46.9 m) and a deck 66 ft wide.

Who owns I-95 NB (SR-9) over St. Marys River?

It is owned by the State Highway Agency.