Csah 21 over Kettle River

Carlton County, Minnesota · rated Fair in the 2025 National Bridge Inventory

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

• Csah 21 over Kettle River in Carlton County, Minnesota, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
• It was built in 1984, making it 41 years old at the 2025 inventory.
• It carries about 45 vehicles a day (traffic count year 2020).
• Its listed owner is the county highway agency.
• It is one of 63 of the 148 inventoried bridges in Carlton County rated fair (42.6%); 13 (8.8%) are rated poor.
• Its traffic status in the 2025 inventory is posted for load (NBI item 41).
• It was rated good in the 2024 inventory and is now fair (substructure 7 to 6).
• Its most recent inspection on record is dated December 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 → (46.63069, -92.85094)

Component ratings

Bridge details

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

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