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I-4 (SR-400) over Lake Gibson Drain Canal

Polk County, Florida · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

I-4 (SR-400) over Lake Gibson Drain Canal in Polk County, Florida, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1961, making it 64 years old at the 2025 inventory.
It carries about 104,500 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 160 of the 359 inventoried bridges in Polk County rated fair (44.6%); 0 (0.0%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition

Source: FHWA National Bridge Inventory, 2025 data as reported by the Florida department of transportation.

Bridge	Built	Vehicles/day	Condition
I-4 (SR-400) over Winston Drain	1999	127,000	Good
I-4 (SR-400) over Winston Creek	1999	127,000	Good
US-27 (SR-25) over I-4 (SR-400)	2004	72,576	Good
US-27 (SR-25) over Black Hills Canal	1965	56,000	Fair
US-27 (SR-25) over US-17 (SR-600)	2000	56,000	Good
I-4 WB (SR-400) over US-98 (SR-35)	2004	54,000	Good