US Bridges

IRR SR1378 over Oconaluftee River

Fair

Swain County, North Carolina · .02 MI.S.JCT.US411 · Structure no. 000000001730160

Built
1972
53 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
135 ft
3 main spans
Daily traffic
14,000
2017 count
Owner
State
State Highway Agency

About this bridge

IRR SR1378 over Oconaluftee River is a concrete continuous slab carrying IRR SR1378 over Oconaluftee River in Swain County, North Carolina. It was built in 1972, so it is 53 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 5 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 14,000 vehicles a day, projected to reach 28,000 by 2040. The structure is 135 ft (41.1 m) long and 52 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIRR SR1378
CrossesOconaluftee River
Location.02 MI.S.JCT.US411
RouteState Highway 1378
CountySwain County
StateNorth Carolina
Coordinates35.49972, -83.30604
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.9 US tons
Inventory rating40.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length135 ft (41.1 m)
Longest span51 ft (15.5 m)
Deck width52 ft (16 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,000 (2017)
Projected traffic28,000 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR SR1378 over Oconaluftee River built?

It was built in 1972, making it 53 years old in 2025.

What condition is IRR SR1378 over Oconaluftee River 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 August 2023.

How much traffic does IRR SR1378 over Oconaluftee River carry?

About 14,000 vehicles per day (2017 count).

How long is IRR SR1378 over Oconaluftee River?

The structure is 135 ft (41.1 m) long with a longest span of 51 ft (15.5 m) and a deck 52 ft wide.

Who owns IRR SR1378 over Oconaluftee River?

It is owned by the State Highway Agency.