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SR-21 over Black Creek

Clay County, Florida · rated Good in the 2025 National Bridge Inventory

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

SR-21 over Black Creek in Clay County, Florida, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2010, making it 15 years old at the 2025 inventory.
It carries about 36,500 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 43 of the 90 inventoried bridges in Clay County rated good (47.8%); 3 (3.3%) are rated poor.
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.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 419 ft
Location	SR-21/BLACK Creek
NBI structure number	710083
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US-17 (SR-15) over Doctors Inlet	1971	58,000	Fair
US-17 (SR-15) over Johnson Slough	1967	51,000	Fair
SR-21 over Grog Branch	1986	36,500	Fair
CR 220 over Swimming Pen Creek	1996	35,000	Good
CR 220 over Grog Branch	1959	34,500	Fair
CR 220 over Little Black Creek	1947	34,500	Poor