US Bridges

I77 Sbl over Fourth Street

Fair

Mecklenburg County, North Carolina · 0.35 Mi. N. Jct. US29 · Structure no. 000000001190231

Built
1972
53 years old, rebuilt 1995
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
134 ft
3 main spans
Daily traffic
69,000
2019 count
Owner
State
State Highway Agency

About this bridge

I77 Sbl over Fourth Street is a steel stringer/multi-beam or girder carrying I77 Sbl over Fourth Street in Mecklenburg County, North Carolina. It was built in 1972 and reconstructed in 1995, so it is 53 years old, older than the North Carolina average of 38.7 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 69,000 vehicles a day, roughly 16% of them trucks, projected to reach 138,000 by 2040. The structure is 134 ft (40.8 m) long and 82 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI77 Sbl
CrossesFourth Street
Location0.35 Mi. N. Jct. US29
RouteInterstate 77
Coordinates35.23372, -80.85869
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating51.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length134 ft (40.8 m)
Longest span83 ft (25.2 m)
Deck width82 ft (24.9 m)
Roadway width78 ft (23.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69,000 (2019)
Projected traffic138,000 by 2040
Trucks16%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 I77 Sbl over Fourth Street built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 1995.

What condition is I77 Sbl over Fourth Street 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 August 2024.

How much traffic does I77 Sbl over Fourth Street carry?

About 69,000 vehicles per day (2019 count), of which roughly 16% are trucks.

How long is I77 Sbl over Fourth Street?

The structure is 134 ft (40.8 m) long with a longest span of 83 ft (25.2 m) and a deck 82 ft wide.

Who owns I77 Sbl over Fourth Street?

It is owned by the State Highway Agency.