US Bridges

I77 Sbl Ramp over Andrill Terr.& Irwin Crk

Fair

Mecklenburg County, North Carolina · 2.1 Mi. S. I-85 · Structure no. 000000001190283

Built
1972
53 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
290 ft
4 main spans
Daily traffic
600
2022 count
Owner
State
State Highway Agency

About this bridge

I77 Sbl Ramp over Andrill Terr.& Irwin Crk is a steel stringer/multi-beam or girder carrying I77 Sbl Ramp over Andrill Terr.& Irwin Crk in Mecklenburg County, North Carolina. It was built in 1972, 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 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 600 vehicles a day, roughly 16% of them trucks, projected to reach 1,200 by 2040. The structure is 290 ft (88.3 m) long and 27 ft wide.

Location

Open in Google Maps
CarriesI77 Sbl Ramp
CrossesAndrill Terr.& Irwin Crk
Location2.1 Mi. S. I-85
RouteInterstate 77
CountyMecklenburg County
StateNorth Carolina
Coordinates35.24599, -80.84861
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating81.9 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length290 ft (88.3 m)
Longest span85 ft (25.9 m)
Deck width27 ft (8.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2022)
Projected traffic1,200 by 2040
Trucks16%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
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 Ramp over Andrill Terr.& Irwin Crk built?

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

What condition is I77 Sbl Ramp over Andrill Terr.& Irwin Crk 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 2024.

How much traffic does I77 Sbl Ramp over Andrill Terr.& Irwin Crk carry?

About 600 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is I77 Sbl Ramp over Andrill Terr.& Irwin Crk?

The structure is 290 ft (88.3 m) long with a longest span of 85 ft (25.9 m) and a deck 27 ft wide.

Who owns I77 Sbl Ramp over Andrill Terr.& Irwin Crk?

It is owned by the State Highway Agency.