US Bridges

SR-121 over I-10 (SR-8)

Fair

Baker County, Florida · SR-121 over I-10 · Structure no. 270016

Built
1960
65 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
220 ft
4 main spans
Daily traffic
7,600
2023 count
Owner
State
State Highway Agency

About this bridge

SR-121 over I-10 (SR-8) is a prestressed concrete stringer/multi-beam or girder carrying SR-121 over I-10 (SR-8) in Baker County, Florida. It was built in 1960, so it is 65 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 7,600 vehicles a day, roughly 13% of them trucks, projected to reach 13,186 by 2045. The structure is 220 ft (67.1 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSR-121
CrossesI-10 (SR-8)
LocationSR-121 over I-10
RouteState Highway 121
CountyBaker County
StateFlorida
Coordinates30.25873, -82.12302
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.2 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length220 ft (67.1 m)
Longest span76 ft (23.2 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,600 (2023)
Projected traffic13,186 by 2045
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-121 over I-10 (SR-8) built?

It was built in 1960, making it 65 years old in 2025.

What condition is SR-121 over I-10 (SR-8) 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 SR-121 over I-10 (SR-8) carry?

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

How long is SR-121 over I-10 (SR-8)?

The structure is 220 ft (67.1 m) long with a longest span of 76 ft (23.2 m) and a deck 34 ft wide.

Who owns SR-121 over I-10 (SR-8)?

It is owned by the State Highway Agency.