US Bridges

I-74 NB over Martin Mill Creek

Good

Forsyth County, North Carolina · 1.62M. N. Jct. US421 Ramp · Structure no. 000000000670668

Built
2020
5 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
225 ft
3 main spans
Daily traffic
4,200
2021 count
Owner
State
State Highway Agency

About this bridge

I-74 NB over Martin Mill Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying I-74 NB over Martin Mill Creek 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 4,200 vehicles a day, roughly 12% of them trucks, projected to reach 8,400 by 2040. The structure is 225 ft (68.5 m) long and 63 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI-74 NB
CrossesMartin Mill Creek
Location1.62M. N. Jct. US421 Ramp
RouteInterstate 74
Coordinates36.13521, -80.13498
Functional classUrban Principal Arterial - Interstate

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating48.9 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length225 ft (68.5 m)
Longest span73 ft (22.2 m)
Deck width63 ft (19.2 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (2021)
Projected traffic8,400 by 2040
Trucks12%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-74 NB over Martin Mill Creek built?

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

What condition is I-74 NB over Martin Mill Creek 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 April 2024.

How much traffic does I-74 NB over Martin Mill Creek carry?

About 4,200 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is I-74 NB over Martin Mill Creek?

The structure is 225 ft (68.5 m) long with a longest span of 73 ft (22.2 m) and a deck 63 ft wide.

Who owns I-74 NB over Martin Mill Creek?

It is owned by the State Highway Agency.