River flow map

Via my friend Amit, I think someone has finally built the map I wanted so long ago. Rivers in the US colored by stream flow. I’m not quite sure what the data is, at least some of it must be models rather than measurements. But it’s good.

The map is at the NWS Enhanced Data Display. It’s some clunky Windows-GUI-in-Javascript thing. But the data is great! The layer we want is under “More Layers / Rivers / Nat. Water Model – Stream Flow”. I set the base map to ESRI Light Gray to see the river layer better.