US Bridges

I74 US311 over South Fork Muddy Creek

Fair

Forsyth County, North Carolina · 0.6 MI.S.JCT.SR2698 · Structure no. 000000000670393

Built
1981
44 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
36 ft
3 main spans
Daily traffic
33,500
2021 count
Owner
State
State Highway Agency

About this bridge

I74 US311 over South Fork Muddy Creek is a concrete continuous culvert carrying I74 US311 over South Fork Muddy Creek in Forsyth County, North Carolina. It was built in 1981, so it is 44 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 33,500 vehicles a day, roughly 16% of them trucks, projected to reach 67,000 by 2040. The structure is 36 ft (10.9 m) long. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI74 US311
CrossesSouth Fork Muddy Creek
Location0.6 MI.S.JCT.SR2698
RouteInterstate 74
Coordinates36.05486, -80.15225
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length36 ft (10.9 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,500 (2021)
Projected traffic67,000 by 2040
Trucks16%
Lanes on structure4
Traffic directionTwo-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 I74 US311 over South Fork Muddy Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is I74 US311 over South Fork Muddy Creek 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 September 2023.

How much traffic does I74 US311 over South Fork Muddy Creek carry?

About 33,500 vehicles per day (2021 count), of which roughly 16% are trucks.

How long is I74 US311 over South Fork Muddy Creek?

The structure is 36 ft (10.9 m) long with a longest span of 8 ft (2.4 m).

Who owns I74 US311 over South Fork Muddy Creek?

It is owned by the State Highway Agency.