NW 312TH St over Castile CR

Clinton County, Missouri · rated Fair in the 2025 National Bridge Inventory

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

• NW 312TH St over Castile CR in Clinton County, Missouri, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
• It was built in 1980, making it 45 years old at the 2025 inventory.
• It carries about 35 vehicles a day (traffic count year 2023).
• Its listed owner is the county highway agency.
• It is one of 90 of the 153 inventoried bridges in Clinton County rated fair (58.8%); 12 (7.8%) 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.

View this bridge on a map → (39.65974, -94.50445)

Component ratings

Bridge details

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

Busiest bridges in Clinton County

All bridges nearby: Clinton County, MO bridge conditions · every bridge in Clinton County · Missouri bridges.

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