US Bridges

SR 23 over N Prong ST Marys River

Fair

Baker County, Florida · At the Florida State Line · Structure no. 27GA78

Built
1955
70 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
219 ft
5 main spans
Daily traffic
630
2020 count
Owner
State
State Highway Agency

About this bridge

SR 23 over N Prong ST Marys River is a steel continuous stringer/multi-beam or girder carrying SR 23 over N Prong ST Marys River in Baker County, Florida. It was built in 1955, so it is 70 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 630 vehicles a day, roughly 1% of them trucks, projected to reach 870 by 2032. The structure is 219 ft (66.8 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 23
CrossesN Prong ST Marys River
LocationAt the Florida State Line
RouteState Highway 23
CountyBaker County
StateFlorida
Coordinates30.36217, -82.13432
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: 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 rating61.5 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length219 ft (66.8 m)
Longest span69 ft (21 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic630 (2020)
Projected traffic870 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

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$1.3 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 23 over N Prong ST Marys River built?

It was built in 1955, making it 70 years old in 2025.

What condition is SR 23 over N Prong 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 July 2023.

How much traffic does SR 23 over N Prong ST Marys River carry?

About 630 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is SR 23 over N Prong ST Marys River?

The structure is 219 ft (66.8 m) long with a longest span of 69 ft (21 m) and a deck 34 ft wide.

Who owns SR 23 over N Prong ST Marys River?

It is owned by the State Highway Agency.