US Bridges

US 29/SC 20 Con over U.S. 29 Nbl

Fair

Anderson County, South Carolina · 3.7MI SW of Williamston · Structure no. 000000000002640

Built
1957
68 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
195 ft
3 main spans
Daily traffic
6,500
2023 count
Owner
State
State Highway Agency

About this bridge

US 29/SC 20 Con over U.S. 29 Nbl is a steel stringer/multi-beam or girder carrying US 29/SC 20 Con over U.S. 29 Nbl in Anderson County, South Carolina. It was built in 1957, so it is 68 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 5 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 6,500 vehicles a day, roughly 3% of them trucks, projected to reach 7,995 by 2043. The structure is 195 ft (59.4 m) long and 26 ft wide.

Location

Open in Google Maps
CarriesUS 29/SC 20 Con
CrossesU.S. 29 Nbl
Location3.7MI SW of Williamston
RouteU.S. Route 29
CountyAnderson County
StateSouth Carolina
Coordinates34.60243, -82.54207
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating66 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length195 ft (59.4 m)
Longest span65 ft (19.8 m)
Deck width26 ft (7.9 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2023)
Projected traffic7,995 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$656,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 29/SC 20 Con over U.S. 29 Nbl built?

It was built in 1957, making it 68 years old in 2025.

What condition is US 29/SC 20 Con over U.S. 29 Nbl 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 December 2023.

How much traffic does US 29/SC 20 Con over U.S. 29 Nbl carry?

About 6,500 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is US 29/SC 20 Con over U.S. 29 Nbl?

The structure is 195 ft (59.4 m) long with a longest span of 65 ft (19.8 m) and a deck 26 ft wide.

Who owns US 29/SC 20 Con over U.S. 29 Nbl?

It is owned by the State Highway Agency.