US Bridges

SR1178 over US321

Fair

Caldwell County, North Carolina · .28 MI.E.JCT.US321A · Structure no. 000000000270051

Built
2015
10 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
203 ft
2 main spans
Daily traffic
4,700
2022 count
Owner
State
State Highway Agency

About this bridge

SR1178 over US321 is a prestressed concrete continuous stringer/multi-beam or girder carrying SR1178 over US321 in Caldwell County, North Carolina. It was built in 2015, so it is 10 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 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 4,700 vehicles a day, roughly 7% of them trucks, projected to reach 9,400 by 2040. The structure is 203 ft (61.8 m) long and 83 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesSR1178
CrossesUS321
Location.28 MI.E.JCT.US321A
RouteState Highway 1178
CountyCaldwell County
StateNorth Carolina
Coordinates35.89021, -81.51936
Functional classUrban Collector

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.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length203 ft (61.8 m)
Longest span101 ft (30.7 m)
Deck width83 ft (25.3 m)
Roadway width69 ft (21.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2022)
Projected traffic9,400 by 2040
Trucks7%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

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 SR1178 over US321 built?

It was built in 2015, making it 10 years old in 2025.

What condition is SR1178 over US321 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 March 2024.

How much traffic does SR1178 over US321 carry?

About 4,700 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SR1178 over US321?

The structure is 203 ft (61.8 m) long with a longest span of 101 ft (30.7 m) and a deck 83 ft wide.

Who owns SR1178 over US321?

It is owned by the State Highway Agency.