US Bridges

US 129 Nbl over NS Railroad

Fair

Bibb County, Georgia · 2.9 MI S of Macon Cty Lmt · Structure no. 000000002100570

Built
1953
72 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
174 ft
3 main spans
Daily traffic
20,600
2024 count
Owner
State
State Highway Agency

About this bridge

US 129 Nbl over NS Railroad is a steel stringer/multi-beam or girder carrying US 129 Nbl over NS Railroad in Bibb County, Georgia. It was built in 1953, so it is 72 years old, older than the Georgia average of 47.5 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 20,600 vehicles a day, roughly 7% of them trucks, projected to reach 34,290 by 2031. The structure is 174 ft (53 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 129 Nbl
CrossesNS Railroad
Location2.9 MI S of Macon Cty Lmt
RouteU.S. Route 129
StateGeorgia
Coordinates32.72, -83.65115
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating35.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length174 ft (53 m)
Longest span58 ft (17.7 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,600 (2024)
Projected traffic34,290 by 2031
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 129 Nbl over NS Railroad built?

It was built in 1953, making it 72 years old in 2025.

What condition is US 129 Nbl over NS Railroad 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 January 2025.

How much traffic does US 129 Nbl over NS Railroad carry?

About 20,600 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is US 129 Nbl over NS Railroad?

The structure is 174 ft (53 m) long with a longest span of 58 ft (17.7 m) and a deck 34 ft wide.

Who owns US 129 Nbl over NS Railroad?

It is owned by the State Highway Agency.