The Shared World: Old Boise 2099

It's a quick and dirty paint over a google maps screenshot, exploring what can be done for worldbuilding and story telling from this kind of source (and geographical data such as GIS).

Context:
Aerial view of the old downtown of Boise, year 2099, that is now a free evolving natural reserve. At that time, the Boise river, which is no longer contained here, has changed course and reclaimed what was once the historical center.