Allegany SP (yes that is the correct spelling) is in the Chautauqua-Allegany NYS Parks region, so use those channels you find here on on NF2G.com. I believe for state forestry you mean EnCon aka DEC, and that would be region 9 for them in WNY.
As for the Seneca Nation, your best bet is to just use the typical public safety channels in Cattaraugus County - 33.70 for fire, 159.405 for law. The Nation has their own police force aka the Marshalls but I am not aware of any radio system information for them, likely though they have some kind of system in place at each casino in Niagara Falls, Buffalo, and Salamanca.