US Bridges

US 76/US 378 over Mill Creek

Good

Richland County, South Carolina · 8 MI SE of Columbia · Structure no. 000000000000970

Built
2018
7 years old
Condition
Good
inspected February 2024
Type
Slab
Concrete Continuous
Length
120 ft
4 main spans
Daily traffic
28,600
2023 count
Owner
State
State Highway Agency

About this bridge

US 76/US 378 over Mill Creek is a concrete continuous slab carrying US 76/US 378 over Mill Creek in Richland County, South Carolina. It was built in 2018, so it is 7 years old, younger 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 28,600 vehicles a day, roughly 7% of them trucks, projected to reach 44,902 by 2043. The structure is 120 ft (36.6 m) long and 86 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 76/US 378
CrossesMill Creek
Location8 MI SE of Columbia
RouteU.S. Route 76
Coordinates33.94788, -80.91174
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length120 ft (36.6 m)
Longest span30 ft (9.1 m)
Deck width86 ft (26.3 m)
Roadway width83 ft (25.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,600 (2023)
Projected traffic44,902 by 2043
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 76/US 378 over Mill Creek built?

It was built in 2018, making it 7 years old in 2025.

What condition is US 76/US 378 over Mill Creek 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 February 2024.

How much traffic does US 76/US 378 over Mill Creek carry?

About 28,600 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 76/US 378 over Mill Creek?

The structure is 120 ft (36.6 m) long with a longest span of 30 ft (9.1 m) and a deck 86 ft wide.

Who owns US 76/US 378 over Mill Creek?

It is owned by the State Highway Agency.