Bridge conditions in Lewis County, New York
169 inventoried bridges · 26 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 169 Lewis County bridges in the federal inventory, 26 carry a poor rating. That 15.4% share is roughly 2x the national average.
- 26 of the 169 bridges in Lewis County, New York, are rated in poor condition (15.4%) in the 2025 National Bridge Inventory, as of .
- 59 bridges (34.9%) are rated good and 84 (49.7%) fair.
- The median Lewis County bridge was built in 1978.
- The busiest poor-rated bridge is Rte 12 over Mill Creek (built 1927), carrying about 2,290 vehicles a day.
Good 34.9% · Fair 49.7% · Poor 15.4% of 169 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
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Rte 12 over Mill Creek | 1913 | 11,108 | Fair |
| East State Street over Mill Creek | 1963 | 6,160 | Fair |
| Rte 12 over Mohawk Adirondack & Nort | 1950 | 5,391 | Fair |
| Rte 12 over Whetstone Creek | 1989 | 5,059 | Fair |
| Rte 12 over Roaring Brook | 1989 | 5,059 | Fair |
| Rte 12 over House Creek | 1964 | 4,976 | Good |
| Rte 12 over Sugar River | 1968 | 4,883 | Fair |
| Rte 812 over Black River | 1993 | 4,284 | Fair |
| Rte 812 over Black Rv Overflow | 1992 | 4,284 | Fair |
| Number Four Road over Black River | 1963 | 4,260 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Lewis County → - all 169, 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.