US Bridges

S-10-91/RIVER RD over Tidal Stream

Fair

Charleston County, South Carolina · 12.4 MI SW of Charleston · Structure no. 000000000002145

Built
1969
56 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
60 ft
4 main spans
Daily traffic
6,900
2023 count
Owner
State
State Highway Agency

About this bridge

S-10-91/RIVER RD over Tidal Stream is a concrete slab carrying S-10-91/RIVER RD over Tidal Stream in Charleston County, South Carolina. It was built in 1969, so it is 56 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 6,900 vehicles a day, roughly 6% of them trucks, projected to reach 9,798 by 2043. The structure is 60 ft (18.3 m) long and 28 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesS-10-91/RIVER RD
CrossesTidal Stream
Location12.4 MI SW of Charleston
RouteState Highway 91
CountyCharleston County
StateSouth Carolina
Coordinates32.71558, -80.01975
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating32.2 US tons
Inventory rating19.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadH 10
Structure length60 ft (18.3 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 traffic6,900 (2023)
Projected traffic9,798 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$420,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

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

It was built in 1969, making it 56 years old in 2025.

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

About 6,900 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is S-10-91/RIVER RD over Tidal Stream?

The structure is 60 ft (18.3 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 Tidal Stream?

It is owned by the State Highway Agency.