US Bridges

US-129 (SR-51) over I-75 (SR-93)

Fair

Hamilton County, Florida · 4 MI N of CR-132 · Structure no. 320011

Built
1962
63 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
244 ft
4 main spans
Daily traffic
4,800
2022 count
Owner
State
State Highway Agency

About this bridge

US-129 (SR-51) over I-75 (SR-93) is a prestressed concrete stringer/multi-beam or girder carrying US-129 (SR-51) over I-75 (SR-93) in Hamilton County, Florida. It was built in 1962, so it is 63 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 4,800 vehicles a day, roughly 11% of them trucks, projected to reach 8,328 by 2042. The structure is 244 ft (74.4 m) long and 34 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesUS-129 (SR-51)
CrossesI-75 (SR-93)
Location4 MI N of CR-132
RouteU.S. Route 129
CountyHamilton County
StateFlorida
Coordinates30.44889, -82.93299
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.6 US tons
Inventory rating29.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length244 ft (74.4 m)
Longest span80 ft (24.4 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,800 (2022)
Projected traffic8,328 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$492,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was US-129 (SR-51) over I-75 (SR-93) built?

It was built in 1962, making it 63 years old in 2025.

What condition is US-129 (SR-51) over I-75 (SR-93) 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 2023.

How much traffic does US-129 (SR-51) over I-75 (SR-93) carry?

About 4,800 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is US-129 (SR-51) over I-75 (SR-93)?

The structure is 244 ft (74.4 m) long with a longest span of 80 ft (24.4 m) and a deck 34 ft wide.

Who owns US-129 (SR-51) over I-75 (SR-93)?

It is owned by the State Highway Agency.