US Bridges

SR1220 over Br.Of Black Swamp

Fair

Onslow County, North Carolina · 0.6 MI W JCT SR1230 · Structure no. 000000001330187

Built
1991
34 years old
Condition
Fair
inspected December 2023
Type
Culvert
Steel
Length
22 ft
2 main spans
Daily traffic
250
2019 count
Owner
State
State Highway Agency

About this bridge

SR1220 over Br.Of Black Swamp is a steel culvert carrying SR1220 over Br.Of Black Swamp in Onslow County, North Carolina. It was built in 1991, so it is 34 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 250 vehicles a day, roughly 6% of them trucks, projected to reach 500 by 2040. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSR1220
CrossesBr.Of Black Swamp
Location0.6 MI W JCT SR1230
RouteState Highway 1220
Coordinates34.87616, -77.64941
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length22 ft (6.7 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 traffic250 (2019)
Projected traffic500 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 SR1220 over Br.Of Black Swamp built?

It was built in 1991, making it 34 years old in 2025.

What condition is SR1220 over Br.Of Black 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 December 2023.

How much traffic does SR1220 over Br.Of Black Swamp carry?

About 250 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is SR1220 over Br.Of Black Swamp?

The structure is 22 ft (6.7 m) long with a longest span of 9 ft (2.7 m).

Who owns SR1220 over Br.Of Black Swamp?

It is owned by the State Highway Agency.