US Bridges

S-16-18 over Spring Branch

Fair

Darlington County, South Carolina · Millers Ave in Hartsville · Structure no. 000000000005499

Built
1969
56 years old, rebuilt 2000
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
3,700
2023 count
Owner
State
State Highway Agency

About this bridge

S-16-18 over Spring Branch is a concrete slab carrying S-16-18 over Spring Branch in Darlington County, South Carolina. It was built in 1969 and reconstructed in 2000, so it is 56 years old, older 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 3,700 vehicles a day, roughly 8% of them trucks, projected to reach 5,217 by 2043. The structure is 45 ft (13.7 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesS-16-18
CrossesSpring Branch
LocationMillers Ave in Hartsville
RouteState Highway 18
CountyDarlington County
StateSouth Carolina
Coordinates34.39541, -80.06012
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width38 ft (11.7 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,700 (2023)
Projected traffic5,217 by 2043
Trucks8%
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 S-16-18 over Spring Branch built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2000.

What condition is S-16-18 over Spring Branch 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 2025.

How much traffic does S-16-18 over Spring Branch carry?

About 3,700 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is S-16-18 over Spring Branch?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 38 ft wide.

Who owns S-16-18 over Spring Branch?

It is owned by the State Highway Agency.