US Bridges

I-77 over Trib-Catawba River

Fair

York County, South Carolina · 3.3 MI NE Rock Hill · Structure no. 000000000006815

Built
1975
50 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
92,100
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 over Trib-Catawba River is a concrete culvert carrying I-77 over Trib-Catawba River in York 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 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 92,100 vehicles a day, roughly 14% of them trucks, projected to reach 128,940 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-77
CrossesTrib-Catawba River
Location3.3 MI NE Rock Hill
RouteInterstate 77
CountyYork County
StateSouth Carolina
Coordinates34.94667, -80.97528
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating48.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic92,100 (2023)
Projected traffic128,940 by 2043
Trucks14%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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-77 over Trib-Catawba River built?

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

What condition is I-77 over Trib-Catawba River 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 March 2024.

How much traffic does I-77 over Trib-Catawba River carry?

About 92,100 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is I-77 over Trib-Catawba River?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m).

Who owns I-77 over Trib-Catawba River?

It is owned by the State Highway Agency.