US Bridges

S-8-946/TRINITY Pi over Unnamed Canal

Fair

Berkeley County, South Carolina · 4 MI W Goose Creek · Structure no. 000000000006624

Built
1975
50 years old
Condition
Fair
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
60 ft
2 main spans
Daily traffic
2,200
2023 count
Owner
State
State Highway Agency

About this bridge

S-8-946/TRINITY Pi over Unnamed Canal is a prestressed concrete tee beam carrying S-8-946/TRINITY Pi over Unnamed Canal in Berkeley County, South Carolina. It was built in 1975, so it is 50 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 2,200 vehicles a day, roughly 5% of them trucks, projected to reach 2,816 by 2043. The structure is 60 ft (18.3 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS-8-946/TRINITY Pi
CrossesUnnamed Canal
Location4 MI W Goose Creek
RouteState Highway 946
CountyBerkeley County
StateSouth Carolina
Coordinates33.01869, -80.09402
Functional classUrban Local

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.
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 inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating25 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadH 15
Structure length60 ft (18.3 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic2,816 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$174,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-8-946/TRINITY Pi over Unnamed Canal built?

It was built in 1975, making it 50 years old in 2025.

What condition is S-8-946/TRINITY Pi over Unnamed Canal 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 December 2024.

How much traffic does S-8-946/TRINITY Pi over Unnamed Canal carry?

About 2,200 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-8-946/TRINITY Pi over Unnamed Canal?

The structure is 60 ft (18.3 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns S-8-946/TRINITY Pi over Unnamed Canal?

It is owned by the State Highway Agency.