SR 646-pa 646 over Pennbrook Run

McKean County, Pennsylvania · rated Fair in the 2025 National Bridge Inventory

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

• SR 646-pa 646 over Pennbrook Run in McKean County, Pennsylvania, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
• It was built in 1930, making it 95 years old at the 2025 inventory.
• It carries about 1,044 vehicles a day (traffic count year 2024).
• Its listed owner is the state highway agency.
• It is one of 85 of the 226 inventoried bridges in McKean County rated fair (37.6%); 40 (17.7%) are rated poor.
• 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 → (41.97318, -78.5645)

Component ratings

Bridge details

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

Busiest bridges in McKean County

All bridges nearby: McKean County, PA bridge conditions · every bridge in McKean County · Pennsylvania bridges.

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