Bridge conditions in Nassau County, New York
328 inventoried bridges · 3 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 328 bridges in Nassau County: 91 rated good, 234 fair, and 3 poor.
- 3 of the 328 bridges in Nassau County, New York, are rated in poor condition (0.9%) in the 2025 National Bridge Inventory, as of .
- 91 bridges (27.7%) are rated good and 234 (71.3%) fair.
- The median Nassau County bridge was built in 1957.
- The busiest poor-rated bridge is Rte 908G over Rte I495 (built 1968), carrying about 129,086 vehicles a day.
Good 27.7% · Fair 71.3% · Poor 0.9% of 328 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.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Rte 908G over Rte I495 | 1968 | 129,086 | Poor |
| Bridge Road over Long Island-pt Ws | 1898 | 1,088 | Poor |
| Seawane Drive over Auerbach Channel | 1932 | – | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Rte I495 over Willis Avenue | 2006 | 190,184 | Fair |
| Rte I495 over Roslyn Road | 2000 | 190,184 | Fair |
| Rte I495 over Locust Lane | 2003 | 190,184 | Good |
| Rte I495 over Lakeville Rd Lakeville | 1958 | 180,778 | Fair |
| Rte 908M over Drain-forest C Pk | 1956 | 178,143 | Fair |
| Rte I495 over Woodbury Road | 1963 | 177,538 | Fair |
| Rte I495 over Manetto Hill Road | 1963 | 172,705 | Fair |
| Rte I495 over 908G 908G 0301 1152 Rte | 1997 | 172,705 | Fair |
| Rte I495 over Gateway Drive | 1962 | 172,450 | Fair |
| Rte I495 over Rte I495 | 1997 | 172,450 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
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.