I-4 (SR-400) EB over Alexander St (cr-574)
Hillsborough County, Florida · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-4 (SR-400) EB over Alexander St (cr-574) in Hillsborough County, Florida, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1999, making it 26 years old at the 2025 inventory.
- It carries about 62,750 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 576 of the 845 inventoried bridges in Hillsborough County rated good (68.2%); 3 (0.4%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (28.03202, -82.13416)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 157 ft |
| Location | 1.6MI West of SR-39 |
| NBI structure number | 100604 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Florida department of transportation.
Busiest bridges in Hillsborough County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-275 (SR-93) over Hillsborough River | 1964 | 250,000 | Fair |
| I-275 NB (SR-93) over Hillsborough River | 1964 | 250,000 | Fair |
| I-4 WB over Palm Avenue | 1963 | 236,000 | Good |
| I-275 NB (SR-93) over Palm Avenue | 1963 | 236,000 | Fair |
| I-275 SB (SR-93) over Business Us-41(sr-685) | 1964 | 222,000 | Fair |
| I-275 NB over Cypress Street | 2015 | 210,000 | Good |
All bridges nearby: Hillsborough County, FL bridge conditions · every bridge in Hillsborough County · Florida bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.