US Bridges

C-23-485 over St. Marks Creek

Good

Greenville County, South Carolina · 4 MI W of Greer · Structure no. 000000000009912

Built
2004
21 years old, rebuilt 2019
Condition
Good
inspected July 2024
Type
Slab
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
150
2023 count
Owner
County
County Highway Agency

About this bridge

C-23-485 over St. Marks Creek is a prestressed concrete slab carrying C-23-485 over St. Marks Creek in Greenville County, South Carolina. It was built in 2004 and reconstructed in 2019, so it is 21 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 150 vehicles a day, roughly 5% of them trucks, projected to reach 192 by 2043. The structure is 25 ft (7.6 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesC-23-485
CrossesSt. Marks Creek
Location4 MI W of Greer
RouteCounty Highway 485
Coordinates34.9423, -82.29402
Functional classUrban Local

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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating76.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2023)
Projected traffic192 by 2043
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 C-23-485 over St. Marks Creek built?

It was built in 2004, making it 21 years old in 2025. It was reconstructed in 2019.

What condition is C-23-485 over St. Marks 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 July 2024.

How much traffic does C-23-485 over St. Marks Creek carry?

About 150 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is C-23-485 over St. Marks Creek?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns C-23-485 over St. Marks Creek?

It is owned by the County Highway Agency.