US Bridges

I-26 EB over Cypress Swamp

Fair

Berkeley County, South Carolina · 14.8 MI SW Moncks Crn · Structure no. 000000000003594

Built
1961
64 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete
Length
210 ft
7 main spans
Daily traffic
27,700
2023 count
Owner
State
State Highway Agency

About this bridge

I-26 EB over Cypress Swamp is a concrete tee beam carrying I-26 EB over Cypress Swamp in Berkeley County, South Carolina. It was built in 1961, so it is 64 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 27,700 vehicles a day, roughly 16% of them trucks, projected to reach 38,503 by 2043. The structure is 210 ft (64 m) long and 32 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesI-26 EB
CrossesCypress Swamp
Location14.8 MI SW Moncks Crn
RouteInterstate 26
CountyBerkeley County
StateSouth Carolina
Coordinates33.09881, -80.24003
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.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating66 US tons
Inventory rating50.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadH 20
Structure length210 ft (64 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,700 (2023)
Projected traffic38,503 by 2043
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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$930,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-26 EB over Cypress Swamp built?

It was built in 1961, making it 64 years old in 2025.

What condition is I-26 EB over Cypress Swamp 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 September 2023.

How much traffic does I-26 EB over Cypress Swamp carry?

About 27,700 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-26 EB over Cypress Swamp?

The structure is 210 ft (64 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns I-26 EB over Cypress Swamp?

It is owned by the State Highway Agency.