Below are some useful links to regional maps

• FEMA Map Viewer The MapViewer – Web application allows you to use your Web browser to view maps, look up attribute information, and create custom maps and reports from FEMA’s National Flood Hazard Layer (NFHL).
• NY State Drainage Basin Map
• NYS Drainage Basins
• NY DEC Stormwater Mapper
• NYS GIS Mapper Includes Ortho Imagery,Rasta Maps and Elevation Data