I-275 SB
I-275 SB in 1.5 MI North Of SR-595, Pinellas County, Florida received a condition grade of B (77/100). Built in 1974, the bridge carries 158K vehicles daily on I-275 SB over 30th AVE North.
I-275 SB carries a B on the BridgeSafety Condition Score with 77/100. 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 1974 and is now 52 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 SB carries an average daily traffic count of 158,000 vehicles, with 3 lane(s) crossing 30th AVE North. 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 SB is a 52-year-old bridge located 1.5 MI North Of SR-595 in Pinellas County, Florida. The bridge carries I-275 SB over 30th AVE North with 3 traffic lanes, handling approximately 158K vehicles per day. Built in 1974, the structure spans 53.4 meters.
The bridge received a Condition Grade of B (77/100) 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 SB has a Condition Score of 77/100 (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 SB was built in 1974, making it 52 years old. The average bridge age in the United States is 48 years.
I-275 SB carries approximately 158K vehicles per day (average daily traffic). The bridge has 3 traffic lanes. It is 53.4 meters long and located on I-275 SB in 1.5 MI North Of SR-595, Pinellas County, Florida.
No, I-275 SB 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 SB is located 1.5 MI North Of SR-595 in Pinellas County, Florida. The bridge carries I-275 SB over 30th AVE North. Its coordinates are 27.799250, -82.662806. It is maintained by State Highway Agency.
I-275 SB carries I-275 SB over 30th AVE North. The bridge is 53.4 meters long and was built in 1974.
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.