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T-556 Great Belt over Trib to Thorn Creek

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

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

T-556 Great Belt over Trib to Thorn Creek in Butler County, Pennsylvania, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1957, making it 68 years old at the 2025 inventory.
It carries about 200 vehicles a day (traffic count year 2017).
Its listed owner is the county highway agency.
It is one of 51 of the 374 inventoried bridges in Butler County rated poor (13.6%); 51 (13.6%) 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


Structure	Steel stringer or multi-beam girder
Length	about 29 ft
Location	0.45 MI NE of SR 2010
NBI structure number	000000000008239
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I-79 SR8079 SR9479 over Trib to Brush Creek	1969	76,555	Fair
SR0019 Nb&sb over Coal Run	1952	43,366	Fair
SR 0228 EB & WB over I-79 Nb&sb & SR9479	2000	42,813	Good
SR0019 Nb&sb over Pa Turnpike Ramp R	2004	34,726	Good
SR0079 Nb&sb over Little Yellow Creek	1963	29,865	Fair
SR0079 Nb&sb over Black Run	1964	29,114	Fair