US Bridges

SR1577 over I77 & US21

Fair

Mecklenburg County, North Carolina · .3 Mi. E. Jct. SR1126 · Structure no. 000000001190150

Built
1999
26 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
171 ft
2 main spans
Daily traffic
26,000
2018 count
Owner
State
State Highway Agency

About this bridge

SR1577 over I77 & US21 is a steel stringer/multi-beam or girder carrying SR1577 over I77 & US21 in Mecklenburg County, North Carolina. It was built in 1999, so it is 26 years old, younger 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 26,000 vehicles a day, roughly 12% of them trucks, projected to reach 52,000 by 2040. The structure is 171 ft (52.1 m) long and 143 ft wide.

Location

Open in Google Maps
CarriesSR1577
CrossesI77 & US21
Location.3 Mi. E. Jct. SR1126
RouteState Highway 1577
CountyMecklenburg County
StateNorth Carolina
Coordinates35.1631, -80.88982
Functional classUrban Other Principal Arterial

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.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating68.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length171 ft (52.1 m)
Longest span84 ft (25.6 m)
Deck width143 ft (43.7 m)
Roadway width106 ft (32.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,000 (2018)
Projected traffic52,000 by 2040
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR1577 over I77 & US21 built?

It was built in 1999, making it 26 years old in 2025.

What condition is SR1577 over I77 & US21 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 May 2023.

How much traffic does SR1577 over I77 & US21 carry?

About 26,000 vehicles per day (2018 count), of which roughly 12% are trucks.

How long is SR1577 over I77 & US21?

The structure is 171 ft (52.1 m) long with a longest span of 84 ft (25.6 m) and a deck 143 ft wide.

Who owns SR1577 over I77 & US21?

It is owned by the State Highway Agency.