US Bridges

NC171 over Deep Run Swamp

Fair

Martin County, North Carolina · 0.2 MI N JCT SR1545 · Structure no. 000000001170017

Built
1950
75 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
28 ft
3 main spans
Daily traffic
2,200
2022 count
Owner
State
State Highway Agency

About this bridge

NC171 over Deep Run Swamp is a concrete continuous culvert carrying NC171 over Deep Run Swamp in Martin County, North Carolina. It was built in 1950, so it is 75 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 2,200 vehicles a day, roughly 7% of them trucks, projected to reach 4,400 by 2040. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesNC171
CrossesDeep Run Swamp
Location0.2 MI N JCT SR1545
RouteState Highway 171
CountyMartin County
StateNorth Carolina
Coordinates35.77345, -76.94655
Functional classRural Major 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 loadUnknown
Structure length28 ft (8.5 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2022)
Projected traffic4,400 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 NC171 over Deep Run Swamp built?

It was built in 1950, making it 75 years old in 2025.

What condition is NC171 over Deep Run Swamp 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 April 2024.

How much traffic does NC171 over Deep Run Swamp carry?

About 2,200 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is NC171 over Deep Run Swamp?

The structure is 28 ft (8.5 m) long with a longest span of 9 ft (2.7 m).

Who owns NC171 over Deep Run Swamp?

It is owned by the State Highway Agency.