US Bridges

US 15 over Ireland Creek

Fair

Colleton County, South Carolina · In Walterboro · Structure no. 000000000001615

Built
1997
28 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete Continuous
Length
102 ft
3 main spans
Daily traffic
9,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 15 over Ireland Creek is a concrete continuous slab carrying US 15 over Ireland Creek in Colleton County, South Carolina. It was built in 1997, so it is 28 years old, younger than the South Carolina average of 48 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 9,700 vehicles a day, roughly 4% of them trucks, projected to reach 13,677 by 2043. The structure is 102 ft (31.1 m) long and 87 ft wide.

CarriesUS 15
CrossesIreland Creek
LocationIn Walterboro
RouteU.S. Route 15
Coordinates32.9082, -80.66725
Functional classUrban Minor 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating53.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length102 ft (31.1 m)
Longest span37 ft (11.3 m)
Deck width87 ft (26.4 m)
Roadway width74 ft (22.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,700 (2023)
Projected traffic13,677 by 2043
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 15 over Ireland Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is US 15 over Ireland Creek 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 March 2024.

How much traffic does US 15 over Ireland Creek carry?

About 9,700 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 15 over Ireland Creek?

The structure is 102 ft (31.1 m) long with a longest span of 37 ft (11.3 m) and a deck 87 ft wide.

Who owns US 15 over Ireland Creek?

It is owned by the State Highway Agency.