Bridge conditions in Blair County, Pennsylvania

338 inventoried bridges · 39 rated poor · 2025 National Bridge Inventory

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

Of the 338 Blair County bridges in the federal inventory, 39 carry a poor rating. That 11.5% share is roughly 2x the national average.

39 of the 338 bridges in Blair County, Pennsylvania, are rated in poor condition (11.5%) in the 2025 National Bridge Inventory, as of August 20, 2026.
123 bridges (36.4%) are rated good and 176 (52.1%) fair.
The median Blair County bridge was built in 1983.
The busiest poor-rated bridge is T473 N. Eighth St over Norfolk Southern RR (built 1979), carrying about 10,200 vehicles a day.

Good 36.4% · Fair 52.1% · Poor 11.5% of 338 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
T473 N. Eighth St over Norfolk Southern RR	1979	10,200	Poor
T473 N. Eighth St over Norfolk Southern RR	1979	10,200	Poor
25TH Avenue over Spring Run	1961	5,701	Poor
SR 1012 over Bald Eagle Creek	1933	2,544	Poor
West Chestnut Ave. over Mill Run	1930	1,848	Poor
CO RD 101 Bedfrd S over South Dry Run	1913	1,634	Poor
13TH Street over Gillans Run	1925	1,569	Poor
16TH Street over Blair Gap Run	1925	1,514	Poor
13TH Street over Brush Run	1975	1,472	Poor
Broad Avenue over Burgoon Run	1940	1,424	Poor
12TH Street over Brush Run	1976	1,415	Poor
16TH Street over Brush Run	1980	1,135	Poor
T-397 Biddle Road over Clover Creek	1908	667	Poor
T456 Old Mill Run over Mill Run	1957	622	Poor
SR 3008(LOBSTOR) over Polecat Run	1973	492	Poor
T-349 Mountain Rd over Frtown.br.juniata River	1954	451	Poor
T433 Church Road over Spencer Run	1960	253	Poor
T352 Butler Hlw Rd over Trib. of South Dry Run	1957	253	Poor
T352 Butler Hlw Rd over South Dry Run	1957	253	Poor
T-364 Chappell Rd over Bobs Creek	1936	251	Poor
T376 Shaw Road over Oldtown Run	1983	250	Poor
T484 Sickl CR Bk R over Sinking Run	1993	250	Poor
T378 Lwr Piney Crk over Piney Creek	1909	219	Poor
T426 Spencer Crk D over Spencer Run	1946	204	Poor
T527 Decker Hollow over Vanscoyoc Run	1915	141	Poor
T427 White BridgeR over Frtown.br.juniata River	1929	125	Poor
T510 Schoch Hollow over Schell Run	1975	107	Poor
T617 Dogwood Drive over Hutchinson Run	1974	104	Poor
T-369 Mill Lane over Clover Creek	1963	98	Poor
North Avenue over Sink Run	1930	92	Poor
T435 Blue Hole Rd over Clover Creek	1915	67	Poor
T-525 Helsel Road over Smoky Run	1920	46	Poor
T-463 Etna Furnace over Roaring Run	1914	44	Poor
T-328 Creps Road over Clover Creek	1912	44	Poor
T381 Negley Spring over Piney Creek	1930	31	Poor
T512 Irish Flats L over Little Juniata River	1898	27	Poor
T734 Kelsey Road over Bells Gap Run	1973	25	Poor
Upper Res.park Rd. over Sink Run	1987	25	Poor
T551 Plummer Hollo over Little Juniata River	1937	17	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
SR 4010 (17TH St) over Brush Run	1985	25,718	Good
SR 4010 (17TH St) over I-99 / US 220	1992	25,718	Good
SR 4010 over SR 4009_NORFOLK So. RR	1973	19,273	Fair
Pa 36/ Pa 164 over Everett Railroad	1951	18,566	Fair
Pa 36 over Halter Creek	1997	17,622	Fair
Pa 36/ Pa 164 over Halter Creek	1951	17,622	Fair
I-99 / US 220 Nbl over SR 1001/BUSINESS US 220	1984	17,022	Fair
I-99 / US 220 Nbl over Pa 36	1985	17,022	Fair
I-99 / US 220 over Private Road	1983	16,449	Good
US 22 over Blair Gap Run	2007	16,252	Good

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

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.