US Bridges

SR3112N over Southern Railroad

Good

Wake County, North Carolina · 0.3 MI.S.JCT.NC54 · Structure no. 000000001831208

Built
2001
24 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
365 ft
3 main spans
Daily traffic
11,000
2021 count
Owner
State
State Highway Agency

About this bridge

SR3112N over Southern Railroad is a steel continuous stringer/multi-beam or girder carrying SR3112N over Southern Railroad in Wake County, North Carolina. It was built in 2001, so it is 24 years old, younger than the North Carolina average of 38.7 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 11,000 vehicles a day, roughly 6% of them trucks, projected to reach 22,000 by 2040. The structure is 365 ft (111.2 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSR3112N
CrossesSouthern Railroad
Location0.3 MI.S.JCT.NC54
RouteState Highway 3112
Coordinates35.8037, -78.81477
Functional classUrban Minor 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.9 US tons
Inventory rating57 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length365 ft (111.2 m)
Longest span152 ft (46.3 m)
Deck width37 ft (11.2 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2021)
Projected traffic22,000 by 2040
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesRailroad
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR3112N over Southern Railroad built?

It was built in 2001, making it 24 years old in 2025.

What condition is SR3112N over Southern 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 December 2023.

How much traffic does SR3112N over Southern Railroad carry?

About 11,000 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is SR3112N over Southern Railroad?

The structure is 365 ft (111.2 m) long with a longest span of 152 ft (46.3 m) and a deck 37 ft wide.

Who owns SR3112N over Southern Railroad?

It is owned by the State Highway Agency.