I-275
I-275 in 1.5mi North Of SR-580, Hillsborough County, Florida received a condition grade of B (73/100). Built in 1966, the bridge carries 149K vehicles daily on I-275 over SR-582/Fowler Avenue.
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 1966 and is now 60 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 149,000 vehicles, with 6 lane(s) crossing SR-582/Fowler 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-275 is a 60-year-old bridge located 1.5mi North Of SR-580 in Hillsborough County, Florida. The bridge carries I-275 over SR-582/Fowler Avenue with 6 traffic lanes, handling approximately 149K vehicles per day. Built in 1966 and reconstructed in 2001, the structure spans 43.9 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 1966 and reconstructed in 2001, making it 60 years old. The average bridge age in the United States is 48 years.
I-275 carries approximately 149K vehicles per day (average daily traffic). The bridge has 6 traffic lanes. It is 43.9 meters long and located on I-275 in 1.5mi North 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 1.5mi North Of SR-580 in Hillsborough County, Florida. The bridge carries I-275 over SR-582/Fowler Avenue. Its coordinates are 28.054661, -82.454789. It is maintained by State Highway Agency.
I-275 carries I-275 over SR-582/Fowler Avenue. The bridge is 43.9 meters long and was built in 1966, with reconstruction in 2001.
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.