US Bridges

SR-121 over St.Marys Crk. Tributary

Fair

Baker County, Florida · 3.7 Mi. S. of I-10 · Structure no. 270018

Built
1940
85 years old, rebuilt 1988
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
8,800
2022 count
Owner
State
State Highway Agency

About this bridge

SR-121 over St.Marys Crk. Tributary is a concrete culvert carrying SR-121 over St.Marys Crk. Tributary 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 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 8,800 vehicles a day, roughly 11% of them trucks, projected to reach 15,268 by 2042. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesSR-121
CrossesSt.Marys Crk. Tributary
Location3.7 Mi. S. of I-10
RouteState Highway 121
CountyBaker County
StateFlorida
Coordinates30.21342, -82.15346
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
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 rating110.1 US tons
Inventory rating67.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,800 (2022)
Projected traffic15,268 by 2042
Trucks11%
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 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 SR-121 over St.Marys Crk. Tributary built?

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

What condition is SR-121 over St.Marys Crk. Tributary 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 December 2023.

How much traffic does SR-121 over St.Marys Crk. Tributary carry?

About 8,800 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is SR-121 over St.Marys Crk. Tributary?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3.1 m).

Who owns SR-121 over St.Marys Crk. Tributary?

It is owned by the State Highway Agency.