US Bridges

S-15-91 over Unnamed Stream

Fair

Colleton County, South Carolina · 4 MI E Cottageville · Structure no. 000000000005275

Built
1968
57 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
950
2023 count
Owner
State
State Highway Agency

About this bridge

S-15-91 over Unnamed Stream is a concrete slab carrying S-15-91 over Unnamed Stream in Colleton County, South Carolina. It was built in 1968, so it is 57 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 950 vehicles a day, roughly 5% of them trucks, projected to reach 1,216 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesS-15-91
CrossesUnnamed Stream
Location4 MI E Cottageville
RouteState Highway 91
Coordinates32.92911, -80.41107
Functional classRural Local

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 inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic950 (2023)
Projected traffic1,216 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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-15-91 over Unnamed Stream built?

It was built in 1968, making it 57 years old in 2025.

What condition is S-15-91 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 February 2025.

How much traffic does S-15-91 over Unnamed Stream carry?

About 950 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-15-91 over Unnamed Stream?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-15-91 over Unnamed Stream?

It is owned by the State Highway Agency.