Fdr over South Fork Boise River

Elmore County, Idaho · rated Good in the 2025 National Bridge Inventory

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

• Fdr over South Fork Boise River in Elmore County, Idaho, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
• It was built in 1956, making it 69 years old at the 2025 inventory.
• It carries about 50 vehicles a day.
• It is one of 25 of the 98 inventoried bridges in Elmore County rated good (25.5%); 8 (8.2%) are rated poor.
• Its traffic status in the 2025 inventory is posted for load (NBI item 41).
• Its condition class and component ratings are unchanged from the 2024 inventory.
• Its most recent inspection on record is dated September 2024, on a 24-month routine inspection cycle.
• It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
• 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.

View this bridge on a map → (43.6044, -115.07965)

Component ratings

Bridge details

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

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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.