Pennsylvania is sitting on a massive backlog of aging bridges, and drivers around Pittsburgh are feeling it. State and federal data show nearly 33,000 spans across the Commonwealth, with thousands rated in poor condition. That translates to detours, weight limits, and long repair lists as a generation of post–World War II structures hits the end of its expected life.
Statewide snapshot and county breakdown
According to CBS Pittsburgh, Pennsylvania has almost 33,000 bridges, and 4,293 of them are classified in poor condition, about 13 percent of the statewide inventory. The outlet's county-by-county breakdown shows western Pennsylvania counties carrying a heavy load of poor-rated spans: Allegheny (1,823 bridges, 205 rated poor), Fayette (558 and 101 poor), Washington (935 and 144 poor) and Westmoreland (918 and 148 poor). Those figures combine state and locally owned bridges and are drawn from a public statewide map that reporters used to tally local counts.
Shapiro and PennDOT point to repairs
At the opening of the new Commercial Street span, Governor Josh Shapiro leaned into the message that the state is tackling the problem, saying roughly 1,900 bridges have been repaired during his administration. A PennDOT news release notes crews used accelerated bridge construction on the I‑376 Commercial Street project and says work has advanced on nearly 1,900 state and local bridges. Officials say those fixes range from short-term preservation work to full replacements, depending on each structure's condition and the money available.
Federal tallies and methodology
Federal counts do not always line up neatly with the state's public maps. The Federal Highway Administration's county-level National Bridge Inventory lists different totals. For example, the Federal Highway Administration shows about 1,294 bridges in Allegheny County, with 115 rated poor, a noticeably smaller tally than the state-level figures used by local reporters.
Those gaps come down to how the data is sliced, who owns which structures, and how “poor” is flagged. FHWA's approach relies on National Bridge Inventory component ratings, where a single primary component rated 4 or lower puts the entire structure in the poor category. The National Transportation Safety Board investigation into the 2022 Fern Hollow collapse found maintenance and oversight failures that sped up structural deterioration, a pointed reminder that age is only part of the risk and that follow-through on inspections matters just as much.
Inspections and what that means for drivers
PennDOT says every bridge gets inspected at least once every two years, and more often if problems turn up. Agency guidance spells out how poor ratings feed into follow-up work, and when those findings trigger restrictions or outright closures. PennDOT's inspection guidance notes that some structures are checked annually or even more frequently, depending on condition.
Pittsburgh Department of Mobility and Infrastructure chief engineer Eric Setzler told CBS Pittsburgh, "We are doing work all the way from small maintenance work all the way up to full replacement, and we will not hesitate to close a bridge if necessary."
For drivers, that translates into a steady diet of intermittent closures, weight limits and detours as crews tackle the worst spans first and chase funding for long-haul replacements. Local officials say they will use public maps and federal inventories to help rank which crossings get attention first, aiming to stretch limited dollars where they will do the most good.
