US Bridges

Sc 319 over Mill Branch

Fair

Horry County, South Carolina · 2.0MI E of Aynor · Structure no. 000000000005761

Built
1970
55 years old
Condition
Fair
inspected August 2024
Type
Channel Beam
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
3,800
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 319 over Mill Branch is a prestressed concrete channel beam carrying Sc 319 over Mill Branch in Horry County, South Carolina. It was built in 1970, so it is 55 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 3,800 vehicles a day, roughly 9% of them trucks, projected to reach 5,548 by 2043. The structure is 30 ft (9.1 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSc 319
CrossesMill Branch
Location2.0MI E of Aynor
RouteState Highway 319
CountyHorry County
StateSouth Carolina
Coordinates33.98984, -79.16207
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating21.1 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,800 (2023)
Projected traffic5,548 by 2043
Trucks9%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$72,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 319 over Mill Branch built?

It was built in 1970, making it 55 years old in 2025.

What condition is Sc 319 over Mill 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 August 2024.

How much traffic does Sc 319 over Mill Branch carry?

About 3,800 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Sc 319 over Mill Branch?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 33 ft wide.

Who owns Sc 319 over Mill Branch?

It is owned by the State Highway Agency.