Bridge conditions in Mercer County, Pennsylvania

437 inventoried bridges · 65 rated poor · 2025 National Bridge Inventory

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

About one in 7 bridges in Mercer County is rated in poor condition: 65 of 437 on the federal inventory, one of the higher shares in Pennsylvania.

65 of the 437 bridges in Mercer County, Pennsylvania, are rated in poor condition (14.9%) in the 2025 National Bridge Inventory, as of August 20, 2026.
179 bridges (41.0%) are rated good and 193 (44.2%) fair.
The median Mercer County bridge was built in 1967.
The busiest poor-rated bridge is SR 58 Main Street over over Wolf Creek (built 1967), carrying about 10,535 vehicles a day.

Good 41.0% · Fair 44.2% · Poor 14.9% of 437 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
SR 58 Main Street over over Wolf Creek	1967	10,535	Poor
SR 60 Nb/sb Beaver over over SR 18 S Hermitage	1966	7,590	Poor
SR 18 New Castle R over over Hog Back Run	1941	7,414	Poor
SR 60 Dock St over over Old Canal Creek	1923	7,198	Poor
Silver Street over Shenango River	1983	5,513	Poor
SR 62 Franklin Rd. over over Spring Creek	1948	3,889	Poor
SR 173 Grove City over over Wolf Creek Trib	1930	3,657	Poor
SR 173 Grove City over Black Run	1923	3,657	Poor
Lincoln Ave over Wolf Creek	1981	3,473	Poor
Ohl Street over Shenango River	1909	3,024	Poor
SR 19 Perry Hwy. over over Johnston Run	1928	2,788	Poor
SR 358 Hadley Road over over SR 79 Nb/sb	1969	2,346	Poor
SR 19 Perry Hwy. over over Shenango River Trib	1942	2,013	Poor
S. Orangeville Rd over Pymatuning	1965	1,987	Poor
SR 846 Saranac Rd. over over Shenango Reservoir	1964	1,985	Poor
Service Ave over Pine Run	1951	1,637	Poor
Prindle Street over Pine Run	1935	1,437	Poor
SR 4019 Methodist over over Little Shenango R	1933	1,054	Poor
SR 2014 Scrubgrass over Cool Spring	1954	985	Poor
SR 2013 E Home St over Munnell Run	1910	951	Poor
SR 846 Orngvlle.rd over over Big Run Trib	1910	741	Poor
SR 2006 Blacktown over over SR 79 Nb/sb	1963	663	Poor
Daugherty Road over Black Run	1983	592	Poor
SR 4021 Atlantic over Bluff Run	1952	567	Poor
Orangeville Rd over Big Run	1964	554	Poor
SR 2017 N.foster R over over Cool Spring Creek	1952	552	Poor
East Gilmore Road over Wolf Creek East Branch	1959	538	Poor
Bend Road over W Br Little Neshannock	1956	488	Poor
SR 2014 Scrubgrass over E Br Wolf Creek Trib.	1939	472	Poor
East Gilmore Road over Wolf Creek	1959	454	Poor
Daugherty Road over Wolf Creek	1953	410	Poor
Old Mercer Road over Neshannock Creek	1922	402	Poor
Hosack Road over Yellow Creek	1965	375	Poor
Marstellar Road over Otter Creek	1960	277	Poor
Wengler Ave over Pine Hollow Run	1929	268	Poor
Lacock Street over Sandy Creek	1971	263	Poor
SR 3022 Rutledge R over Booth Run	1941	262	Poor
SR 2104 Fox Mine R over over SR 79 Nb/sb	1965	255	Poor
Robertson Road over Golden Run	1956	253	Poor
McKinley Ave over Munnell Run	1976	250	Poor
Hosack Road over Yellow Creek Branch	1965	241	Poor
Wozniak Road over Harthegig Run	1963	220	Poor
Triple Link Road over Butchery Run	1958	157	Poor
Hassel Road over Magargee Run	1975	152	Poor
Wise Road over Big Run	1968	139	Poor
Scott Road over Shenango River Tributary	1957	135	Poor
CN Railroad (B&LE) over Orr Road	1928	124	Poor
North Spring Road over Mill Run	1922	98	Poor
Heasley Road over Shenango River Tributary	1922	89	Poor
Carpenter Road over Little Shenango	1961	87	Poor
Larimer Road over Sandy Creek	1963	82	Poor
Murphy Road over Branch of Shenango	1963	78	Poor
Hosack Road over Yellow Creek	1965	76	Poor
Runkle Lane over Cool Springs Creek	1954	61	Poor
Mill Road over Little Shenango River	1885	57	Poor
Crouser School Rd over Mill Creek	1908	43	Poor
Williamson Road over Little Shenango Branch	1934	32	Poor
Yeager Road over Pine Run	1961	31	Poor
Bishop Road over Sandy Creek	1985	31	Poor
Huron Street over Chestnut Run	1897	28	Poor
Scofield Road over Sandy Creek	1969	27	Poor
Hutchison Road over Little Shenango Branch	1965	24	Poor
Crystal Spring over Little Sandy Creek	1965	21	Poor
Creek Road over North Deer Creek	1987	10	Poor
Calvin Road over Bluff Run	1900	–	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
SR 80 Eb/wb & Ramp over Hogback Run	1966	26,925	Good
SR 79 Nb/sb over over Pine Run	1963	21,958	Fair
SR 80 EB over over SR 718 Sieg Hill Rd	1964	13,718	Fair
SR 80 EB over over Abandon RR &shngo R	1966	13,718	Fair
SR 80 EB over over SR 18 New Castle Rd	1993	13,718	Good
SR 60 Nb/sb Beaver over over Hogback Run	1966	13,476	Fair
SR 80 WB over over SR 718 Sieg Hill Rd	1964	13,426	Fair
SR 80 WB over over Abandon RR &shngo R	1966	13,426	Fair
SR 80 WB over over SR 18 New Castle Rd	1994	13,426	Good
SR 80 WB over over SR 19 Nb/sb Perry	1965	13,129	Fair

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

Every bridge in Mercer County → - all 437, 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.