US Bridges

S-45-121 over Mingo Creek

Good

Williamsburg County, South Carolina · 1.0 MI N Nesmith · Structure no. 000000000007044

Built
2016
9 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
240 ft
3 main spans
Daily traffic
700
2023 count
Owner
State
State Highway Agency

About this bridge

S-45-121 over Mingo Creek is a prestressed concrete stringer/multi-beam or girder carrying S-45-121 over Mingo Creek in Williamsburg County, South Carolina. It was built in 2016, so it is 9 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 700 vehicles a day, roughly 6% of them trucks, projected to reach 1,022 by 2043. The structure is 240 ft (73.2 m) long and 36 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesS-45-121
CrossesMingo Creek
Location1.0 MI N Nesmith
RouteState Highway 121
Coordinates33.66784, -79.50534
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating56.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length240 ft (73.2 m)
Longest span80 ft (24.4 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2023)
Projected traffic1,022 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-45-121 over Mingo Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is S-45-121 over Mingo 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 September 2023.

How much traffic does S-45-121 over Mingo Creek carry?

About 700 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is S-45-121 over Mingo Creek?

The structure is 240 ft (73.2 m) long with a longest span of 80 ft (24.4 m) and a deck 36 ft wide.

Who owns S-45-121 over Mingo Creek?

It is owned by the State Highway Agency.