US Bridges

Natural Bridge Rd. over Branch of ST Marks River

Good

Leon County, Florida · 6.3 Miles East of SR 363 · Structure no. 554153

Built
2016
9 years old
Condition
Good
inspected April 2024
Type
Slab
Concrete Continuous
Length
124 ft
4 main spans
Daily traffic
2,400
2023 count
Owner
County
County Highway Agency

About this bridge

Natural Bridge Rd. over Branch of ST Marks River is a concrete continuous slab carrying Natural Bridge Rd. over Branch of ST Marks River in Leon County, Florida. It was built in 2016, so it is 9 years old, younger 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 2,400 vehicles a day, roughly 7% of them trucks, projected to reach 2,640 by 2043. The structure is 124 ft (37.9 m) long and 27 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesNatural Bridge Rd.
CrossesBranch of ST Marks River
Location6.3 Miles East of SR 363
RouteCounty Highway 0
CountyLeon County
StateFlorida
Coordinates30.28556, -84.14919
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length124 ft (37.9 m)
Longest span31 ft (9.4 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,400 (2023)
Projected traffic2,640 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Natural Bridge Rd. over Branch of ST Marks River built?

It was built in 2016, making it 9 years old in 2025.

What condition is Natural Bridge Rd. over Branch of ST Marks River 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 April 2024.

How much traffic does Natural Bridge Rd. over Branch of ST Marks River carry?

About 2,400 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Natural Bridge Rd. over Branch of ST Marks River?

The structure is 124 ft (37.9 m) long with a longest span of 31 ft (9.4 m) and a deck 27 ft wide.

Who owns Natural Bridge Rd. over Branch of ST Marks River?

It is owned by the County Highway Agency.