US Bridges

SR1209 over Back Swamp

FairPosted for load

Onslow County, North Carolina · 0.1 MI S. of Jct. SR1210 · Structure no. 000000001330062

Built
1969
56 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
36 ft
2 main spans
Daily traffic
750
2019 count
Owner
State
State Highway Agency

About this bridge

SR1209 over Back Swamp is a wood or timber stringer/multi-beam or girder carrying SR1209 over Back Swamp in Onslow County, North Carolina. It was built in 1969, so it is 56 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. Its operating status is: posted for load restriction.

It carries about 750 vehicles a day, roughly 6% of them trucks, projected to reach 1,500 by 2040. The structure is 36 ft (10.9 m) long and 25 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesSR1209
CrossesBack Swamp
Location0.1 MI S. of Jct. SR1210
RouteState Highway 1209
CountyOnslow County
StateNorth Carolina
Coordinates34.81376, -77.65116
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.9 US tons
Inventory rating22.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length36 ft (10.9 m)
Longest span17 ft (5.1 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2019)
Projected traffic1,500 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR1209 over Back Swamp built?

It was built in 1969, making it 56 years old in 2025.

What condition is SR1209 over Back 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 January 2024.

How much traffic does SR1209 over Back Swamp carry?

About 750 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is SR1209 over Back Swamp?

The structure is 36 ft (10.9 m) long with a longest span of 17 ft (5.1 m) and a deck 25 ft wide.

Who owns SR1209 over Back Swamp?

It is owned by the State Highway Agency.