US Bridges

SR-121 over Oak Branch

Good

Baker County, Florida · 3.3 Mi. N. of Union Co. · Structure no. 270005

Built
1940
85 years old, rebuilt 1988
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
26 ft
3 main spans
Daily traffic
7,600
2023 count
Owner
State
State Highway Agency

About this bridge

SR-121 over Oak Branch is a concrete culvert carrying SR-121 over Oak Branch in Baker County, Florida. It was built in 1940 and reconstructed in 1988, so it is 85 years old, older 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 7,600 vehicles a day, roughly 13% of them trucks, projected to reach 10,450 by 2045. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesSR-121
CrossesOak Branch
Location3.3 Mi. N. of Union Co.
RouteState Highway 121
CountyBaker County
StateFlorida
Coordinates30.18568, -82.16733
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
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 rating46.1 US tons
Inventory rating29.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,600 (2023)
Projected traffic10,450 by 2045
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR-121 over Oak Branch built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1988.

What condition is SR-121 over Oak Branch 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 November 2024.

How much traffic does SR-121 over Oak Branch carry?

About 7,600 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR-121 over Oak Branch?

The structure is 26 ft (7.9 m) long with a longest span of 8 ft (2.4 m).

Who owns SR-121 over Oak Branch?

It is owned by the State Highway Agency.