US Bridges

I40 Bus US421 over Brookstown Avenue

Good

Forsyth County, North Carolina · 0.4M. E. Jct. SR3013 · Structure no. 000000000670288

Built
2020
5 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
75 ft
1 main span
Daily traffic
49,500
2021 count
Owner
State
State Highway Agency

About this bridge

I40 Bus US421 over Brookstown Avenue is a prestressed concrete stringer/multi-beam or girder carrying I40 Bus US421 over Brookstown Avenue in Forsyth County, North Carolina. It was built in 2020, so it is 5 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 49,500 vehicles a day, roughly 12% of them trucks, projected to reach 99,000 by 2040. The structure is 75 ft (22.8 m) long and 111 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI40 Bus US421
CrossesBrookstown Avenue
Location0.4M. E. Jct. SR3013
RouteInterstate 40
Coordinates36.09244, -80.24967
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating48 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length75 ft (22.8 m)
Longest span69 ft (21 m)
Deck width111 ft (33.8 m)
Roadway width104 ft (31.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49,500 (2021)
Projected traffic99,000 by 2040
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I40 Bus US421 over Brookstown Avenue built?

It was built in 2020, making it 5 years old in 2025.

What condition is I40 Bus US421 over Brookstown Avenue 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 January 2024.

How much traffic does I40 Bus US421 over Brookstown Avenue carry?

About 49,500 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is I40 Bus US421 over Brookstown Avenue?

The structure is 75 ft (22.8 m) long with a longest span of 69 ft (21 m) and a deck 111 ft wide.

Who owns I40 Bus US421 over Brookstown Avenue?

It is owned by the State Highway Agency.