US Bridges

I77 over Branch of Irwin Creek

Good

Mecklenburg County, North Carolina · 0.6 MI.N.JCT.SR2112 · Structure no. 000000001190343

Built
1974
51 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
76,500
2022 count
Owner
State
State Highway Agency

About this bridge

I77 over Branch of Irwin Creek is a concrete continuous culvert carrying I77 over Branch of Irwin Creek in Mecklenburg County, North Carolina. It was built in 1974, so it is 51 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 76,500 vehicles a day, roughly 16% of them trucks, projected to reach 153,000 by 2040. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI77
CrossesBranch of Irwin Creek
Location0.6 MI.N.JCT.SR2112
RouteInterstate 77
Coordinates35.34103, -80.84851
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length25 ft (7.6 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic76,500 (2022)
Projected traffic153,000 by 2040
Trucks16%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 over Branch of Irwin Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is I77 over Branch of Irwin Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does I77 over Branch of Irwin Creek carry?

About 76,500 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is I77 over Branch of Irwin Creek?

The structure is 25 ft (7.6 m) long with a longest span of 10 ft (3 m).

Who owns I77 over Branch of Irwin Creek?

It is owned by the State Highway Agency.