US Bridges

I40 over SR4121

Fair

Guilford County, North Carolina · 1.3 Mi. W. of Jct. US220 · Structure no. 000000000810312

Built
1976
49 years old, rebuilt 1996
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
208 ft
3 main spans
Daily traffic
115,000
2022 count
Owner
State
State Highway Agency

About this bridge

I40 over SR4121 is a steel stringer/multi-beam or girder carrying I40 over SR4121 in Guilford County, North Carolina. It was built in 1976 and reconstructed in 1996, so it is 49 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 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 115,000 vehicles a day, roughly 16% of them trucks, projected to reach 230,000 by 2040. The structure is 208 ft (63.3 m) long and 157 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI40
CrossesSR4121
Location1.3 Mi. W. of Jct. US220
RouteInterstate 40
CountyGuilford County
StateNorth Carolina
Coordinates36.04411, -79.8409
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.9 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length208 ft (63.3 m)
Longest span110 ft (33.5 m)
Deck width157 ft (47.8 m)
Roadway width153 ft (46.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic115,000 (2022)
Projected traffic230,000 by 2040
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 over SR4121 built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 1996.

What condition is I40 over SR4121 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 2024.

How much traffic does I40 over SR4121 carry?

About 115,000 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is I40 over SR4121?

The structure is 208 ft (63.3 m) long with a longest span of 110 ft (33.5 m) and a deck 157 ft wide.

Who owns I40 over SR4121?

It is owned by the State Highway Agency.