US Bridges

I-26 over Saw Mill Branch

Fair

Berkeley County, South Carolina · 13.3 MI SW Moncks Crn · Structure no. 000000000003189

Built
1960
65 years old, rebuilt 1999
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
93,600
2023 count
Owner
State
State Highway Agency

About this bridge

I-26 over Saw Mill Branch is a concrete culvert carrying I-26 over Saw Mill Branch in Berkeley County, South Carolina. It was built in 1960 and reconstructed in 1999, so it is 65 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 93,600 vehicles a day, roughly 11% of them trucks, projected to reach 125,424 by 2043. The structure is 21 ft (6.3 m) long and 210 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesI-26
CrossesSaw Mill Branch
Location13.3 MI SW Moncks Crn
RouteInterstate 26
CountyBerkeley County
StateSouth Carolina
Coordinates33.03516, -80.14578
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width210 ft (64 m)
Roadway width144 ft (43.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic93,600 (2023)
Projected traffic125,424 by 2043
Trucks11%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-26 over Saw Mill Branch built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1999.

What condition is I-26 over Saw Mill Branch 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 over Saw Mill Branch carry?

About 93,600 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I-26 over Saw Mill Branch?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 210 ft wide.

Who owns I-26 over Saw Mill Branch?

It is owned by the State Highway Agency.