US Bridges

S-17-429 over Martins Branch

Fair

Dillon County, South Carolina · 7MI N Dillon · Structure no. 000000000005031

Built
1967
58 years old, rebuilt 1999
Condition
Fair
inspected February 2024
Type
Slab
Concrete
Length
30 ft
2 main spans
Daily traffic
50
2023 count
Owner
State
State Highway Agency

About this bridge

S-17-429 over Martins Branch is a concrete slab carrying S-17-429 over Martins Branch in Dillon County, South Carolina. It was built in 1967 and reconstructed in 1999, so it is 58 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 5 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 50 vehicles a day, projected to reach 64 by 2043. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesS-17-429
CrossesMartins Branch
Location7MI N Dillon
RouteState Highway 429
Coordinates34.54404, -79.40367
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.4 US tons
Inventory rating19 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 10
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic64 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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-17-429 over Martins Branch built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1999.

What condition is S-17-429 over Martins 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 February 2024.

How much traffic does S-17-429 over Martins Branch carry?

About 50 vehicles per day (2023 count).

How long is S-17-429 over Martins Branch?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-17-429 over Martins Branch?

It is owned by the State Highway Agency.