US Bridges

US-129 (SR-100) over Alligator Creek

Fair

Hamilton County, Florida · 6.5 Mi. N. of Jasper · Structure no. 320007

Built
1967
58 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
160 ft
4 main spans
Daily traffic
1,206
2022 count
Owner
State
State Highway Agency

About this bridge

US-129 (SR-100) over Alligator Creek is a prestressed concrete stringer/multi-beam or girder carrying US-129 (SR-100) over Alligator Creek in Hamilton County, Florida. It was built in 1967, so it is 58 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 1,206 vehicles a day, roughly 28% of them trucks, projected to reach 2,092 by 2042. The structure is 160 ft (48.8 m) long and 35 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesUS-129 (SR-100)
CrossesAlligator Creek
Location6.5 Mi. N. of Jasper
RouteU.S. Route 129
CountyHamilton County
StateFlorida
Coordinates30.60412, -83.0167
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.5 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span40 ft (12.2 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,206 (2022)
Projected traffic2,092 by 2042
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 US-129 (SR-100) over Alligator Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is US-129 (SR-100) over Alligator Creek 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 October 2023.

How much traffic does US-129 (SR-100) over Alligator Creek carry?

About 1,206 vehicles per day (2022 count), of which roughly 28% are trucks.

How long is US-129 (SR-100) over Alligator Creek?

The structure is 160 ft (48.8 m) long with a longest span of 40 ft (12.2 m) and a deck 35 ft wide.

Who owns US-129 (SR-100) over Alligator Creek?

It is owned by the State Highway Agency.