Hi, Duffy C!
I, too, am in Rochester and looking for Doherty connections! I have so little to go on, though. Is there anywhere in your Dohertys a Mary born in England between about 1840 and 1850? She married James Callahan. Her first child (to survive infancy?) was b. 1868. They had 4 girls, Annie, Hannah, Bridget and Mary. James died in 1873 in Donegal. Can't find birth of any of them or marriage of Mary and James. Elder 2 girls came to Pgh in 1883. Younger 2 stayed and married in Donegal in 1890s, listing their townland as Tirargus, though that may have been their grandfather Callahan's place. They had an uncle Hugh, but idk whether he was a Doherty or a Callahan. I have no other info at all on our Dohertys!