US Bridges

S-26-308 over Prince Mill Swamp

Poor

Horry County, South Carolina · 7MI NE Aynor · Structure no. 000000000003674

Built
1961
64 years old, rebuilt 1995
Condition
Poor
inspected June 2024
Type
Slab
Concrete
Length
90 ft
6 main spans
Daily traffic
125
2023 count
Owner
State
State Highway Agency

About this bridge

S-26-308 over Prince Mill Swamp is a concrete slab carrying S-26-308 over Prince Mill Swamp in Horry County, South Carolina. It was built in 1961 and reconstructed in 1995, so it is 64 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 125 vehicles a day, roughly 5% of them trucks, projected to reach 174 by 2043. The structure is 90 ft (27.4 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS-26-308
CrossesPrince Mill Swamp
Location7MI NE Aynor
RouteState Highway 308
Coordinates34.06978, -79.09384
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.8 US tons
Inventory rating18.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadH 10
Structure length90 ft (27.4 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2023)
Projected traffic174 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$426,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-26-308 over Prince Mill Swamp built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1995.

What condition is S-26-308 over Prince Mill Swamp in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does S-26-308 over Prince Mill Swamp carry?

About 125 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-26-308 over Prince Mill Swamp?

The structure is 90 ft (27.4 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-26-308 over Prince Mill Swamp?

It is owned by the State Highway Agency.