US Bridges

I-26 over S-1600 & RR NS

Fair

Charleston County, South Carolina · 0.5 MI W N Charleston · Structure no. 000000000004267

Built
1964
61 years old, rebuilt 1990
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
320 ft
2 main spans
Daily traffic
85,050
2023 count
Owner
State
State Highway Agency

About this bridge

I-26 over S-1600 & RR NS is a steel stringer/multi-beam or girder carrying I-26 over S-1600 & RR NS in Charleston County, South Carolina. It was built in 1964 and reconstructed in 1990, so it is 61 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 85,050 vehicles a day, roughly 7% of them trucks, projected to reach 130,977 by 2043. The structure is 320 ft (97.4 m) long and 150 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-26
CrossesS-1600 & RR NS
Location0.5 MI W N Charleston
RouteInterstate 26
CountyCharleston County
StateSouth Carolina
Coordinates32.88889, -80.01946
Functional classUrban Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length320 ft (97.4 m)
Longest span98 ft (29.9 m)
Deck width150 ft (45.7 m)
Roadway width146 ft (44.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85,050 (2023)
Projected traffic130,977 by 2043
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$2.7 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-26 over S-1600 & RR NS built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1990.

What condition is I-26 over S-1600 & RR NS 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 August 2024.

How much traffic does I-26 over S-1600 & RR NS carry?

About 85,050 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-26 over S-1600 & RR NS?

The structure is 320 ft (97.4 m) long with a longest span of 98 ft (29.9 m) and a deck 150 ft wide.

Who owns I-26 over S-1600 & RR NS?

It is owned by the State Highway Agency.