US Bridges

I40 over Silas Creek

Fair

Forsyth County, North Carolina · 0.3 Mi. E. Jct. SR1137 · Structure no. 000000000670189

Built
1959
66 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
39 ft
3 main spans
Daily traffic
62,500
2022 count
Owner
State
State Highway Agency

About this bridge

I40 over Silas Creek is a concrete continuous culvert carrying I40 over Silas Creek in Forsyth County, North Carolina. It was built in 1959, so it is 66 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 62,500 vehicles a day, roughly 16% of them trucks, projected to reach 125,000 by 2040. The structure is 39 ft (11.8 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI40
CrossesSilas Creek
Location0.3 Mi. E. Jct. SR1137
RouteInterstate 40
CountyForsyth County
StateNorth Carolina
Coordinates36.0548, -80.35378
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 inspectionJuly 2024
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 length39 ft (11.8 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62,500 (2022)
Projected traffic125,000 by 2040
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 I40 over Silas Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is I40 over Silas 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 July 2024.

How much traffic does I40 over Silas Creek carry?

About 62,500 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is I40 over Silas Creek?

The structure is 39 ft (11.8 m) long with a longest span of 12 ft (3.6 m).

Who owns I40 over Silas Creek?

It is owned by the State Highway Agency.