US Bridges

Sc 311 over Trib to Tupelo Bay

Good

Berkeley County, South Carolina · 10.0 MI SE Holly Hill · Structure no. 000000000001278

Built
1943
82 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
1,450
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 311 over Trib to Tupelo Bay is a concrete culvert carrying Sc 311 over Trib to Tupelo Bay in Berkeley County, South Carolina. It was built in 1943, so it is 82 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,450 vehicles a day, roughly 23% of them trucks, projected to reach 2,117 by 2043. The structure is 21 ft (6.4 m) long and 38 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesSc 311
CrossesTrib to Tupelo Bay
Location10.0 MI SE Holly Hill
RouteState Highway 311
Coordinates33.27417, -80.27111
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,450 (2023)
Projected traffic2,117 by 2043
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 311 over Trib to Tupelo Bay built?

It was built in 1943, making it 82 years old in 2025.

What condition is Sc 311 over Trib to Tupelo Bay in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Sc 311 over Trib to Tupelo Bay carry?

About 1,450 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is Sc 311 over Trib to Tupelo Bay?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 38 ft wide.

Who owns Sc 311 over Trib to Tupelo Bay?

It is owned by the State Highway Agency.