US Bridges

I-10 (SR-8) over Prong of St.Marys River

Fair

Baker County, Florida · 1.2 Mi. W of SR-121 · Structure no. 270053

Built
1961
64 years old, rebuilt 1973
Condition
Fair
inspected November 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
32,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-10 (SR-8) over Prong of St.Marys River is a concrete culvert carrying I-10 (SR-8) over Prong of St.Marys River in Baker County, Florida. It was built in 1961 and reconstructed in 1973, so it is 64 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 32,500 vehicles a day, roughly 30% of them trucks, projected to reach 56,388 by 2045. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesI-10 (SR-8)
CrossesProng of St.Marys River
Location1.2 Mi. W of SR-121
RouteInterstate 10
CountyBaker County
StateFlorida
Coordinates30.26013, -82.14279
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.8 US tons
Inventory rating55.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 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 traffic32,500 (2023)
Projected traffic56,388 by 2045
Trucks30%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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-10 (SR-8) over Prong of St.Marys River built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1973.

What condition is I-10 (SR-8) over Prong of 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 November 2024.

How much traffic does I-10 (SR-8) over Prong of St.Marys River carry?

About 32,500 vehicles per day (2023 count), of which roughly 30% are trucks.

How long is I-10 (SR-8) over Prong of St.Marys River?

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

Who owns I-10 (SR-8) over Prong of St.Marys River?

It is owned by the State Highway Agency.