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T741 Old Route 422 over Trib Slippery Rock Creek

Lawrence County, Pennsylvania · rated Poor in the 2025 National Bridge Inventory

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

T741 Old Route 422 over Trib Slippery Rock Creek in Lawrence County, Pennsylvania, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1921, making it 104 years old at the 2025 inventory.
It carries about 300 vehicles a day (traffic count year 2019).
Its listed owner is a town or township highway agency.
It is one of 30 of the 266 inventoried bridges in Lawrence County rated poor (11.3%); 30 (11.3%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings

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

Bridge	Built	Vehicles/day	Condition
Pa Tpk (I-76) over T-306	2006	21,767	Good
Pa Turnpike (I-76) over Honey Creek;wb-101	2008	21,767	Good
Pa Turnpike(i-76) over LR37056 SR 3002;wb-102	2008	21,767	Good
Pa Turnpike (I-76) over Beaver Dam Run	2008	21,767	Good
Pa Turnpike (I-76) over N Fork Little Beaver Ck	1952	21,767	Fair
Pa Tpk (I-376) over Jenkins Run	1992	19,742	Fair