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The Blue Belt is Pittsburgh, Pennsylvania's fifth and innermost original "belt" in the Pittsburgh/Allegheny County Belt System, running a complete circumference of the city in 40 miles. The belt was originally set up in the 1940s though the current route was adjusted in the 1970s.
The current Blue Belt runs relatively close to skirting the border of the City of Pittsburgh on all sides, though it does make excursions into border towns such as Dormont, Pennsylvania. In its path around the city, the belt crosses or joins PA 8, PA 28, PA 51, PA 88, PA 121, and PA 837. It also briefly joins US 19. Only a small portion of the route (on PA 28) is a freeway. The belt crosses the Ohio River on the McKees Rocks Bridge, the Allegheny River on the Highland Park Bridge and the Monongahela River on the Homestead High Level Bridge.
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