US Bridges

US421S NC55 over Dunn-Erwin Rail Trail

Fair

Harnett County, North Carolina · 0.1 Mi. N. of Jct. SR1703 · Structure no. 000000000850022

Built
1957
68 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
113 ft
5 main spans
Daily traffic
14,500
2021 count
Owner
State
State Highway Agency

About this bridge

US421S NC55 over Dunn-Erwin Rail Trail is a prestressed concrete stringer/multi-beam or girder carrying US421S NC55 over Dunn-Erwin Rail Trail in Harnett County, North Carolina. It was built in 1957, so it is 68 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 14,500 vehicles a day, roughly 12% of them trucks, projected to reach 29,000 by 2040. The structure is 113 ft (34.4 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS421S NC55
CrossesDunn-Erwin Rail Trail
Location0.1 Mi. N. of Jct. SR1703
RouteU.S. Route 421
CountyHarnett County
StateNorth Carolina
Coordinates35.32952, -78.66297
Functional classUrban Other Principal Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating36.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length113 ft (34.4 m)
Longest span21 ft (6.4 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,500 (2021)
Projected traffic29,000 by 2040
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US421S NC55 over Dunn-Erwin Rail Trail built?

It was built in 1957, making it 68 years old in 2025.

What condition is US421S NC55 over Dunn-Erwin Rail Trail 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 February 2025.

How much traffic does US421S NC55 over Dunn-Erwin Rail Trail carry?

About 14,500 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is US421S NC55 over Dunn-Erwin Rail Trail?

The structure is 113 ft (34.4 m) long with a longest span of 21 ft (6.4 m) and a deck 33 ft wide.

Who owns US421S NC55 over Dunn-Erwin Rail Trail?

It is owned by the State Highway Agency.