Bridge conditions in Dauphin County, Pennsylvania

448 inventoried bridges · 41 rated poor · 2025 National Bridge Inventory

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

41 of the 448 bridges the federal inventory lists in Dauphin County are rated poor; the rest split 96 good and 311 fair.

• 41 of the 448 bridges in Dauphin County, Pennsylvania, are rated in poor condition (9.2%) in the 2025 National Bridge Inventory, as of August 20, 2026.
• 96 bridges (21.4%) are rated good and 311 (69.4%) fair.
• The median Dauphin County bridge was built in 1972.
• The busiest poor-rated bridge is SR 0083; I-83 over Susq.river;r.r.lowther S (built 1960), carrying about 89,499 vehicles a day.

Good 21.4% · Fair 69.4% · Poor 9.2% of 448 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 Dauphin County → - all 448, busiest first, each with its own condition record.

All of Pennsylvania: Pennsylvania 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.