US Bridges

US 301 over Salkehatchie River Swamp

Fair

Allendale County, South Carolina · 1MI N of Ulmers · Structure no. 000000000002889

Built
1959
66 years old, rebuilt 1969
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
66 ft
3 main spans
Daily traffic
3,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 301 over Salkehatchie River Swamp is a concrete slab carrying US 301 over Salkehatchie River Swamp in Allendale County, South Carolina. It was built in 1959 and reconstructed in 1969, so it is 66 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 3,000 vehicles a day, roughly 35% of them trucks, projected to reach 5,220 by 2043. The structure is 66 ft (20.1 m) long and 76 ft wide.

Location

Open in Google Maps
CarriesUS 301
CrossesSalkehatchie River Swamp
Location1MI N of Ulmers
RouteU.S. Route 301
CountyAllendale County
StateSouth Carolina
Coordinates33.10985, -81.18805
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating37.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length66 ft (20.1 m)
Longest span22 ft (6.7 m)
Deck width76 ft (23.1 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2023)
Projected traffic5,220 by 2043
Trucks35%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 US 301 over Salkehatchie River Swamp built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1969.

What condition is US 301 over Salkehatchie River 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 May 2024.

How much traffic does US 301 over Salkehatchie River Swamp carry?

About 3,000 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is US 301 over Salkehatchie River Swamp?

The structure is 66 ft (20.1 m) long with a longest span of 22 ft (6.7 m) and a deck 76 ft wide.

Who owns US 301 over Salkehatchie River Swamp?

It is owned by the State Highway Agency.