I-275
I-275 in 0.7mi South Of SR-580, Hillsborough County, Florida received a condition grade of B (73/100). Built in 1967, the bridge carries 182K vehicles daily on I-275 over Bird Street.
I-275 carries a B on the BridgeSafety Condition Score with 73/100. 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 1967 and is now 59 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-275 carries an average daily traffic count of 181,500 vehicles, with 6 lane(s) crossing Bird 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
I-275 is a 59-year-old bridge located 0.7mi South Of SR-580 in Hillsborough County, Florida. The bridge carries I-275 over Bird Street with 6 traffic lanes, handling approximately 182K vehicles per day. Built in 1967 and reconstructed in 2014, the structure spans 52.7 meters.
The bridge received a Condition Grade of B (73/100) 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-275 has a Condition Score of 73/100 (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-275 was built in 1967 and reconstructed in 2014, making it 59 years old. The average bridge age in the United States is 48 years.
I-275 carries approximately 182K vehicles per day (average daily traffic). The bridge has 6 traffic lanes. It is 52.7 meters long and located on I-275 in 0.7mi South Of SR-580, Hillsborough County, Florida.
No, I-275 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-275 is located 0.7mi South Of SR-580 in Hillsborough County, Florida. The bridge carries I-275 over Bird Street. Its coordinates are 28.022569, -82.455833. It is maintained by State Highway Agency.
I-275 carries I-275 over Bird Street. The bridge is 52.7 meters long and was built in 1967, with reconstruction in 2014.
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.