US Bridges

US 23-129 Alt Nbl over CSX Railroad

Good

Bibb County, Georgia · 4.7 MI E of Macon · Structure no. 000000002100460

Built
1970
55 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
189 ft
3 main spans
Daily traffic
1,130
2024 count
Owner
State
State Highway Agency

About this bridge

US 23-129 Alt Nbl over CSX Railroad is a steel stringer/multi-beam or girder carrying US 23-129 Alt Nbl over CSX Railroad in Bibb County, Georgia. It was built in 1970, so it is 55 years old, older than the Georgia average of 47.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,130 vehicles a day, roughly 1% of them trucks, projected to reach 15,015 by 2032. The structure is 189 ft (57.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 23-129 Alt Nbl
CrossesCSX Railroad
Location4.7 MI E of Macon
RouteU.S. Route 23
StateGeorgia
Coordinates32.80351, -83.56875
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.9 US tons
Inventory rating48.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length189 ft (57.6 m)
Longest span63 ft (19.2 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,130 (2024)
Projected traffic15,015 by 2032
Trucks1%
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 NetworkNon-Interstate STRAHNET route

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$1.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 23-129 Alt Nbl over CSX Railroad built?

It was built in 1970, making it 55 years old in 2025.

What condition is US 23-129 Alt Nbl over CSX Railroad in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2024.

How much traffic does US 23-129 Alt Nbl over CSX Railroad carry?

About 1,130 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is US 23-129 Alt Nbl over CSX Railroad?

The structure is 189 ft (57.6 m) long with a longest span of 63 ft (19.2 m) and a deck 43 ft wide.

Who owns US 23-129 Alt Nbl over CSX Railroad?

It is owned by the State Highway Agency.