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US-1 (SR 5) over Whale Harbor

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

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

US-1 (SR 5) over Whale Harbor in Monroe 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 1951 and reconstructed in 1978, making it 74 years old at the 2025 inventory.
It carries about 20,700 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 32 of the 98 inventoried bridges in Monroe County rated good (32.7%); 5 (5.1%) 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 644 ft
Location	Islamorada Key (mm 83.8)
NBI structure number	900076
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 1 (SR 5) over Rockland Channel	1979	47,000	Good
US 1 (SR 5) over Salt Run	1992	38,500	Fair
US 1 (SR 5) over Naval Base Blvd	1988	27,500	Good
US 1 (SR 5) over Jewfish Creek	2008	26,500	Good
US 1 (NB & SB) over Manatee Creek	2008	26,500	Fair
US-1 (SR-5) over Vaca Cut	1982	25,000	Fair