I-4 WB
I-4 WB in 0.2 MI S Of I-4 I-275 JCT, Hillsborough County, Florida received a condition grade of B (71/100). Built in 1963, the bridge carries 236K vehicles daily on I-4 WB over Palm Avenue.
I-4 WB carries a B on the BridgeSafety Condition Score with 71/100. 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 1963 and is now 63 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. I-4 WB carries an average daily traffic count of 236,000 vehicles, with 3 lane(s) crossing Palm Avenue. 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
I-4 WB is a 63-year-old bridge located 0.2 MI S Of I-4 I-275 JCT in Hillsborough County, Florida. The bridge carries I-4 WB over Palm Avenue with 3 traffic lanes, handling approximately 236K vehicles per day. Built in 1963 and reconstructed in 2006, the structure spans 44 meters.
The bridge received a Condition Grade of B (71/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 7/9 (good), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-4 WB has a Condition Score of 71/100 (Grade B). Its deck is rated 7/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-4 WB was built in 1963 and reconstructed in 2006, making it 63 years old. The average bridge age in the United States is 48 years.
I-4 WB carries approximately 236K vehicles per day (average daily traffic). The bridge has 3 traffic lanes. It is 44 meters long and located on I-4 WB in 0.2 MI S Of I-4 I-275 JCT, Hillsborough County, Florida.
No, I-4 WB is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
I-4 WB is located 0.2 MI S Of I-4 I-275 JCT in Hillsborough County, Florida. The bridge carries I-4 WB over Palm Avenue. Its coordinates are 27.962258, -82.453725. It is maintained by State Highway Agency.
I-4 WB carries I-4 WB over Palm Avenue. The bridge is 44 meters long and was built in 1963, with reconstruction in 2006.
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.