The St. Patrick’s Day Parade is this Saturday, March 12. The parade will be held downtown and will begin at 10AM. Festivities will continue in Market Square, beginning at 2PM. The parade has been staged in Pittsburgh since 1869, although the route has been changed over the decades. There is more information about the parade and its history on the Pittsburgh Irish site. To see the parade route, click here.
If you are going to be traveling from Polish Hill through downtown, you might want to take a look at road and bus detours for the day. From Port Authority —
Many bus routes passing through the Strip District will be detoured as early as 8 a.m., with other detours starting around 9 a.m. Throughout Downtown and the Strip District, certain stops will not be served for the duration of the parade; temporary stops will be served in their place. Regular stops and routes are expected to resume around 2:30 p.m. Additionally, some West End and South Hills bus routes will terminate at Station Square, where riders continuing into Downtown can transfer to the T for free; the 28X Airport Flyer and outbound G2 West Busway-Oakland also will serve Station Square, temporarily bypassing Downtown. Full details on the detours.
The Pittsburgh Bureau of Police has also issued a list of road closures, which is available on their site.