US Bridges

S-8-16 over Mill Branch

Fair

Berkeley County, South Carolina · 5MI SW Moncks Corner · Structure no. 000000000006429

Built
2001
24 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
4,500
2023 count
Owner
State
State Highway Agency

About this bridge

S-8-16 over Mill Branch is a prestressed concrete box beam or girders - multiple carrying S-8-16 over Mill Branch in Berkeley County, South Carolina. It was built in 2001, so it is 24 years old, younger 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 4,500 vehicles a day, roughly 14% of them trucks, projected to reach 6,165 by 2043. The structure is 50 ft (15.2 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS-8-16
CrossesMill Branch
Location5MI SW Moncks Corner
RouteState Highway 16
Coordinates33.17769, -80.09904
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.4 US tons
Inventory rating34 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span50 ft (15.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,500 (2023)
Projected traffic6,165 by 2043
Trucks14%
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 statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$170,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-8-16 over Mill Branch built?

It was built in 2001, making it 24 years old in 2025.

What condition is S-8-16 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 September 2024.

How much traffic does S-8-16 over Mill Branch carry?

About 4,500 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is S-8-16 over Mill Branch?

The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m) and a deck 30 ft wide.

Who owns S-8-16 over Mill Branch?

It is owned by the State Highway Agency.