US Bridges

I40 Bus over Miller St. & Southern RR

Fair

Forsyth County, North Carolina · 0.3 Mi. E. JCT.US158 · Structure no. 000000000670254

Built
1956
69 years old, rebuilt 1999
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
327 ft
6 main spans
Daily traffic
22,000
2020 count
Owner
State
State Highway Agency

About this bridge

I40 Bus over Miller St. & Southern RR is a steel stringer/multi-beam or girder carrying I40 Bus over Miller St. & Southern RR in Forsyth County, North Carolina. It was built in 1956 and reconstructed in 1999, so it is 69 years old, older than the North Carolina average of 38.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 22,000 vehicles a day, roughly 12% of them trucks, projected to reach 44,000 by 2040. The structure is 327 ft (99.6 m) long and 96 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI40 Bus
CrossesMiller St. & Southern RR
Location0.3 Mi. E. JCT.US158
RouteInterstate 40
Coordinates36.09308, -80.27401
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.9 US tons
Inventory rating49.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length327 ft (99.6 m)
Longest span69 ft (21 m)
Deck width96 ft (29.3 m)
Roadway width92 ft (28 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2020)
Projected traffic44,000 by 2040
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I40 Bus over Miller St. & Southern RR built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1999.

What condition is I40 Bus over Miller St. & Southern RR 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 May 2024.

How much traffic does I40 Bus over Miller St. & Southern RR carry?

About 22,000 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is I40 Bus over Miller St. & Southern RR?

The structure is 327 ft (99.6 m) long with a longest span of 69 ft (21 m) and a deck 96 ft wide.

Who owns I40 Bus over Miller St. & Southern RR?

It is owned by the State Highway Agency.