Old Stream Map V 1.2 Apr 2026

: Integration of USGS Historical Topographic Map Collection, LiDAR digital elevation models, and municipal drainage records.

: A mobile-integrated view that allows users to point their phone at a dry valley or street corner to see a 3D simulation of the original water flow. Old Stream Map v 1.2

: Uses LiDAR (Light Detection and Ranging) data to highlight depressions in the earth where streams once existed, even if they are now paved over or dry. : Integration of USGS Historical Topographic Map Collection,

: A granular slider that transitions the map view from current satellite imagery to 19th-century hydrographic surveys and geological "best-guess" paleo-channels. LiDAR digital elevation models