US Bridges

SR1556 over Armstrong Creek

Fair

McDowell County, North Carolina · .02 MI.N.JCT.SR1559 · Structure no. 000000001110288

Built
1990
35 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
143 ft
3 main spans
Daily traffic
620
2016 count
Owner
State
State Highway Agency

About this bridge

SR1556 over Armstrong Creek is a prestressed concrete stringer/multi-beam or girder carrying SR1556 over Armstrong Creek in McDowell County, North Carolina. It was built in 1990, so it is 35 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 620 vehicles a day, roughly 6% of them trucks, projected to reach 1,240 by 2040. The structure is 143 ft (43.5 m) long and 31 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesSR1556
CrossesArmstrong Creek
Location.02 MI.N.JCT.SR1559
RouteState Highway 1556
Coordinates35.79413, -82.02018
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating44 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length143 ft (43.5 m)
Longest span45 ft (13.7 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2016)
Projected traffic1,240 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR1556 over Armstrong Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is SR1556 over Armstrong 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 SR1556 over Armstrong Creek carry?

About 620 vehicles per day (2016 count), of which roughly 6% are trucks.

How long is SR1556 over Armstrong Creek?

The structure is 143 ft (43.5 m) long with a longest span of 45 ft (13.7 m) and a deck 31 ft wide.

Who owns SR1556 over Armstrong Creek?

It is owned by the State Highway Agency.