I40
I40 in In Knoxville, Knox County, Tennessee received a condition grade of B (69/100). Built in 1965, the bridge carries 140K vehicles daily on I40 over I40 / 21st. Street.
I40 carries a B on the BridgeSafety Condition Score with 69/100. 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 1965 and is now 61 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. I40 carries an average daily traffic count of 139,697 vehicles, with 7 lane(s) crossing I40 / 21st. 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
I40 is a 61-year-old bridge located In Knoxville in Knox County, Tennessee. The bridge carries I40 over I40 / 21st. Street with 7 traffic lanes, handling approximately 140K vehicles per day. Built in 1965 and reconstructed in 1981, the structure spans 43.4 meters.
The bridge received a Condition Grade of B (69/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 7/9 (good), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I40 has a Condition Score of 69/100 (Grade B). Its deck is rated 6/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
I40 was built in 1965 and reconstructed in 1981, making it 61 years old. The average bridge age in the United States is 48 years.
I40 carries approximately 140K vehicles per day (average daily traffic). The bridge has 7 traffic lanes. It is 43.4 meters long and located on I40 in In Knoxville, Knox County, Tennessee.
No, I40 is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
I40 is located In Knoxville in Knox County, Tennessee. The bridge carries I40 over I40 / 21st. Street. Its coordinates are 35.962581, -83.942969. It is maintained by State Highway Agency.
I40 carries I40 over I40 / 21st. Street. The bridge is 43.4 meters long and was built in 1965, with reconstruction in 1981.
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.