US Bridges

S-10-91/RIVER RD over Unnamed Stream

Fair

Charleston County, South Carolina · 12.2 MI SW Chas · Structure no. 000000000004948

Built
1963
62 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
30 ft
2 main spans
Daily traffic
3,300
2023 count
Owner
State
State Highway Agency

About this bridge

S-10-91/RIVER RD over Unnamed Stream is a concrete slab carrying S-10-91/RIVER RD over Unnamed Stream in Charleston County, South Carolina. It was built in 1963, so it is 62 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 3,300 vehicles a day, roughly 7% of them trucks, projected to reach 6,204 by 2043. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesS-10-91/RIVER RD
CrossesUnnamed Stream
Location12.2 MI SW Chas
RouteState Highway 91
Coordinates32.65941, -80.07722
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.1 US tons
Inventory rating27.4 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 width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (2023)
Projected traffic6,204 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$107,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-10-91/RIVER RD over Unnamed Stream built?

It was built in 1963, making it 62 years old in 2025.

What condition is S-10-91/RIVER RD 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-10-91/RIVER RD over Unnamed Stream carry?

About 3,300 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S-10-91/RIVER RD 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 28 ft wide.

Who owns S-10-91/RIVER RD over Unnamed Stream?

It is owned by the State Highway Agency.