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US-1 (SR-5) NB over St. Lucie River / SR-707

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

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

US-1 (SR-5) NB over St. Lucie River / SR-707 in Martin County, Florida, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1997, making it 28 years old at the 2025 inventory.
It carries about 29,148 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 34 of the 129 inventoried bridges in Martin County rated fair (26.4%); 1 (0.8%) 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


Structure	Continuous prestressed concrete segmental box girder
Length	about 4,564 ft
Location	1 Mile South of SR-707
NBI structure number	890152
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-95 (SR-9) over Drainage Ditch	1987	111,500	Good
Sr-9(i-95) over Drainage Ditch	1987	103,500	Good
I-95 (SR-9) over Hanson Grant Outlet	1987	74,500	Fair
SR 91 Tpk 137.25 over Drainage Ditch	1957	59,900	Good
SR91 N/S Tpk 138.1 over County Line Canal C-23	1957	59,900	Fair
SR91 N/S Tpk 135.6 over Bessey Creek	1957	59,900	Fair