US Bridges

I-77 Nbl over Windsor Lake/Jackson CR

Fair

Richland County, South Carolina · 8 MI NE of Columbia · Structure no. 000000000007829

Built
1984
41 years old, rebuilt 2018
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
360 ft
1 main span
Daily traffic
30,600
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 Nbl over Windsor Lake/Jackson CR is a steel stringer/multi-beam or girder carrying I-77 Nbl over Windsor Lake/Jackson CR in Richland County, South Carolina. It was built in 1984 and reconstructed in 2018, so it is 41 years old, younger 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 30,600 vehicles a day, roughly 15% of them trucks, projected to reach 37,944 by 2043. The structure is 360 ft (109.7 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-77 Nbl
CrossesWindsor Lake/Jackson CR
Location8 MI NE of Columbia
RouteInterstate 77
CountyRichland County
StateSouth Carolina
Coordinates34.07373, -80.92917
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+10 approach)
Design loadHS 20 + Mod
Structure length360 ft (109.7 m)
Longest span60 ft (18.3 m)
Deck width63 ft (19.2 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,600 (2023)
Projected traffic37,944 by 2043
Trucks15%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-77 Nbl over Windsor Lake/Jackson CR built?

It was built in 1984, making it 41 years old in 2025. It was reconstructed in 2018.

What condition is I-77 Nbl over Windsor Lake/Jackson CR 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 February 2024.

How much traffic does I-77 Nbl over Windsor Lake/Jackson CR carry?

About 30,600 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is I-77 Nbl over Windsor Lake/Jackson CR?

The structure is 360 ft (109.7 m) long with a longest span of 60 ft (18.3 m) and a deck 63 ft wide.

Who owns I-77 Nbl over Windsor Lake/Jackson CR?

It is owned by the State Highway Agency.