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Twin Sisters Rd over Moose River

Lewis County, New York · rated Poor in the 2025 National Bridge Inventory

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

Twin Sisters Rd over Moose River in Lewis County, New York, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1920 and reconstructed in 2005, making it 105 years old at the 2025 inventory.
It carries about 7 vehicles a day (traffic count year 2018).
Its listed owner is the county highway agency.
It is one of 26 of the 169 inventoried bridges in Lewis County rated poor (15.4%); 26 (15.4%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings

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

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