Irr Bia Route 46 over North Fork White River

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

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

• Irr Bia Route 46 over North Fork White River in Navajo 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 1962, making it 63 years old at the 2025 inventory.
• It carries about 1,000 vehicles a day (traffic count year 2021).
• It is one of 124 of the 278 inventoried bridges in Navajo County rated fair (44.6%); 6 (2.2%) 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.

View this bridge on a map → (33.78939, -109.99714)

Component ratings

Bridge details

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

Busiest bridges in Navajo County

All bridges nearby: Navajo County, AZ bridge conditions · every bridge in Navajo County · Arizona bridges.

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