Bia Route 3 over Coolidge Dam W. Spillway

Gila County, Arizona · rated Fair in the 2025 National Bridge Inventory

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

• Bia Route 3 over Coolidge Dam W. Spillway in Gila County, Arizona, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
• It was built in 1928 and reconstructed in 1995, making it 97 years old at the 2025 inventory.
• It carries about 390 vehicles a day (traffic count year 2021).
• It is one of 108 of the 259 inventoried bridges in Gila County rated fair (41.7%); 4 (1.5%) are rated poor.
• Its traffic status in the 2025 inventory is posted for another load-capacity restriction (speed, number of vehicles on the bridge, etc.) (NBI item 41).
• It was rated poor in the 2024 inventory and is now fair (deck 4 to 5, superstructure 4 to 5, substructure 4 to 5).
• Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
• 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.

View this bridge on a map → (33.17528, -110.52889)

Component ratings

Bridge details

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

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