The Allegheny in New York

—miles of stream

—lakes & ponds

—square miles

The edge of this watershed

— miles of drainage divide

— miles of the 42nd parallel

Why the streams thicken

a first spring—

Biggest by the miles above them

Where it leaves New York

How far it is to the sea

And then where

Dim everything outside the basin you pick Show the land underneath Get it at print size, 36 by 15 inches

Divide and tributary systems: USGS Watershed Boundary Dataset, the seventeen HUC10s of the Allegheny subregion that reach New York. Water: USGS NHD High Resolution. State line: US Census TIGER. Relief © Esri. © Ryan Sajdak 2026 · ☕ Coffee