US Bridges

SR1173 over Grissett Swamp

Good

Columbus County, North Carolina · 0.5 Mi.W. of Jct. SR1145 · Structure no. 000000000470098

Built
2010
15 years old
Condition
Good
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
1,300
2018 count
Owner
State
State Highway Agency

About this bridge

SR1173 over Grissett Swamp is a prestressed concrete box beam or girders - multiple carrying SR1173 over Grissett Swamp in Columbus County, North Carolina. It was built in 2010, so it is 15 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,300 vehicles a day, roughly 6% of them trucks, projected to reach 2,600 by 2040. The structure is 87 ft (26.5 m) long and 33 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesSR1173
CrossesGrissett Swamp
Location0.5 Mi.W. of Jct. SR1145
RouteState Highway 1173
CountyColumbus County
StateNorth Carolina
Coordinates34.13993, -78.76586
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 rating99 US tons
Inventory rating61 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length87 ft (26.5 m)
Longest span83 ft (25.2 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2018)
Projected traffic2,600 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 SR1173 over Grissett Swamp built?

It was built in 2010, making it 15 years old in 2025.

What condition is SR1173 over Grissett Swamp in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does SR1173 over Grissett Swamp carry?

About 1,300 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is SR1173 over Grissett Swamp?

The structure is 87 ft (26.5 m) long with a longest span of 83 ft (25.2 m) and a deck 33 ft wide.

Who owns SR1173 over Grissett Swamp?

It is owned by the State Highway Agency.