Bridge conditions in Jefferson County, New York

318 inventoried bridges · 32 rated poor · 2025 National Bridge Inventory

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

Jefferson County has 32 bridges rated poor out of 318 inventoried, a 10.1% share that puts it well above the national rate of about 7%.

• 32 of the 318 bridges in Jefferson County, New York, are rated in poor condition (10.1%) in the 2025 National Bridge Inventory, as of August 20, 2026.
• 128 bridges (40.3%) are rated good and 158 (49.7%) fair.
• The median Jefferson County bridge was built in 1969.
• The busiest poor-rated bridge is Rte I81 over South Sandy Creek (built 1961), carrying about 9,336 vehicles a day.

Good 40.3% · Fair 49.7% · Poor 10.1% of 318 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Busiest bridges in the county

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

Every bridge in Jefferson County → - all 318, busiest first, each with its own condition record.

All of New York: New York bridge conditions by county · every download on the data page.

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