I77 NBL
I77 NBL in 0.5 MI. N. JCT. Us29, Mecklenburg County, North Carolina received a condition grade of B (76/100). Built in 1972, the bridge carries 140K vehicles daily on I77 NBL over West Trade Street.
I77 NBL carries a B on the BridgeSafety Condition Score with 76/100. Most component ratings are solid; one or two may show wear consistent with the structure’s age, but the bridge is not flagged as structurally deficient.
The bridge was built in 1972 and is now 54 years old, at or past the typical 50-year design life for bridges of its vintage. Maintenance and inspection cycles are correspondingly more involved than for newer structures. I77 NBL carries an average daily traffic count of 140,000 vehicles, with 4 lane(s) crossing West Trade Street. The owning agency is State Highway Agency; bridge inspection records flow into the federal NBI database annually.
Component Ratings
The riding surface, evaluated for cracking, spalling, and wear
Beams, girders, and trusses that support the deck
Piers, abutments, and foundations below the deck
Bridge Details
About This Bridge
I77 NBL is a 54-year-old bridge located 0.5 MI. N. JCT. Us29 in Mecklenburg County, North Carolina. The bridge carries I77 NBL over West Trade Street with 4 traffic lanes, handling approximately 140K vehicles per day. Built in 1972 and reconstructed in 1996, the structure spans 64.6 meters.
The bridge received a Condition Grade of B (76/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 8/9 (good), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I77 NBL has a Condition Score of 76/100 (Grade B). Its deck is rated 7/9, superstructure 8/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I77 NBL was built in 1972 and reconstructed in 1996, making it 54 years old. The average bridge age in the United States is 48 years.
I77 NBL carries approximately 140K vehicles per day (average daily traffic). The bridge has 4 traffic lanes. It is 64.6 meters long and located on I77 NBL in 0.5 MI. N. JCT. Us29, Mecklenburg County, North Carolina.
No, I77 NBL is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
I77 NBL is located 0.5 MI. N. JCT. Us29 in Mecklenburg County, North Carolina. The bridge carries I77 NBL over West Trade Street. Its coordinates are 35.235922, -80.855783. It is maintained by State Highway Agency.
I77 NBL carries I77 NBL over West Trade Street. The bridge is 64.6 meters long and was built in 1972, with reconstruction in 1996.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.
Source: FHWA National Bridge Inventory, 2026.