I-4 (SR-400)
I-4 (SR-400) in 0.5 MI E/O Polk Pkwy, Polk County, Florida received a condition grade of F (0/100). Built in 1999, the bridge carries 127K vehicles daily on I-4 (SR-400) over Winston Drain. It is classified as structurally deficient.
I-4 (SR-400) carries an F on the BridgeSafety Condition Score with 0/100 — the bottom tier of the FHWA NBI distribution. Component ratings flag the structure for near-term rehabilitation or replacement; the bridge may remain open to traffic but is on the priority list for action.
The bridge was built in 1999, making it 27 years old — past the early-life period but still well within typical service life. Routine inspections and modest repair work are normal for bridges in this age band. I-4 (SR-400) carries an average daily traffic count of 127,000 vehicles, with 11 lane(s) crossing Winston Drain. 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 (SR-400) is a 27-year-old bridge located 0.5 MI E/O Polk Pkwy in Polk County, Florida. The bridge carries I-4 (SR-400) over Winston Drain with 11 traffic lanes, handling approximately 127K vehicles per day. Built in 1999, the structure spans 6.7 meters.
The bridge received a Condition Grade of F (0/100) based on Federal Highway Administration inspection data. Its deck is rated 0/9 (serious), superstructure 0/9 (serious), and substructure 0/9 (serious). The bridge is classified as structurally deficient, meaning at least one major component is rated 4 or below, this signals a need for repair or replacement but does not necessarily indicate an immediate safety hazard.
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-4 (SR-400) has a Condition Score of 0/100 (Grade F). Its deck is rated 0/9, superstructure 0/9, and substructure 0/9 on the NBI scale. The bridge is classified as structurally deficient.
I-4 (SR-400) was built in 1999, making it 27 years old. The average bridge age in the United States is 48 years.
I-4 (SR-400) carries approximately 127K vehicles per day (average daily traffic). The bridge has 11 traffic lanes. It is 6.7 meters long and located on I-4 (SR-400) in 0.5 MI E/O Polk Pkwy, Polk County, Florida.
Yes, I-4 (SR-400) is classified as structurally deficient because at least one of its primary components (deck, superstructure, or substructure) is rated 4 or below on the 0-9 NBI scale. This does not necessarily mean it is unsafe, but it requires significant repair or replacement.
I-4 (SR-400) is located 0.5 MI E/O Polk Pkwy in Polk County, Florida. The bridge carries I-4 (SR-400) over Winston Drain. Its coordinates are 28.040122, -82.032000. It is maintained by State Highway Agency.
I-4 (SR-400) carries I-4 (SR-400) over Winston Drain. The bridge is 6.7 meters long and was built in 1999.
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.