US Bridges

S-10-317 over Unnamed Stream

Fair

Charleston County, South Carolina · 4.5 MI N Ravenel · Structure no. 000000000006632

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
30 ft
2 main spans
Daily traffic
3,100
2023 count
Owner
State
State Highway Agency

About this bridge

S-10-317 over Unnamed Stream is a concrete slab carrying S-10-317 over Unnamed Stream in Charleston County, South Carolina. It was built in 1975, so it is 50 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 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 3,100 vehicles a day, roughly 23% of them trucks, projected to reach 6,200 by 2043. The structure is 30 ft (9.1 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesS-10-317
CrossesUnnamed Stream
Location4.5 MI N Ravenel
RouteState Highway 317
CountyCharleston County
StateSouth Carolina
Coordinates32.83347, -80.22844
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 15
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2023)
Projected traffic6,200 by 2043
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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-10-317 over Unnamed Stream built?

It was built in 1975, making it 50 years old in 2025.

What condition is S-10-317 over Unnamed Stream 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 June 2023.

How much traffic does S-10-317 over Unnamed Stream carry?

About 3,100 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is S-10-317 over Unnamed Stream?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 33 ft wide.

Who owns S-10-317 over Unnamed Stream?

It is owned by the State Highway Agency.